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 Repair Your Chassis Properly

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PostSubject: Repair Your Chassis Properly   Thu Nov 13, 2014 1:52 am

Many people contemplate chassis repairs on 4X4’s but are put off them, they require nothing more than basic fabrication and welding skills, a welder, angle grinder, some accessories, and a little ingenuity along with some basic fabrication tools.

Chassis sections on most 4X4’s are 3mm or thicker section and can be welded with either MIG or arc welding; I would recommend a MIG welder of around 150 amps and 0.8mm wire or an arc welder of no less than 100 amps and a selection of 1.6 and 2mm electrodes.

Angle grinders should ideally be 115mm or 4.5” as these hold the industrial sized accessories as they have the M14 thread instead of the smaller M10 thread of the 4” angle grinders.
Angle grinder accessories should include:
Backing pad for resin bonded discs as these flex and bend.
Resin bonded discs in a coarse and fine size as these are more delicate than a traditional abrasive disc and clean up just as quickly without leaving the score marks as they remove less metal and leave a finer finish and are better suited to thinner metal sections and sheet metal. Once you have used them you will rarely use abrasive grinding discs again.
Wire brush of around 3” / 75mm diameter, these simply screw onto your angle grinder and are great for initial removal of contamination and can be cleaned.
Thin abrasive cutting discs often called plasma or slitting discs, these are much thinner than the traditional 3mm thick cutting disc, generate much less heat, and going for 0.8 or 1mm thick discs is the better option.

Fabrication tools should include:

Scriber to mark score lines onto metal, avoid pencil as it rubs off and the lines are much thicker than a scriber, you cannot rub a scribed line off as it scores the metal.
Steel rule 12”/300mm long as this provides a straight edge for scribing against for accurate lines.
5 metre measuring tape as this is long enough to measure must chassis.
Small centre pop, this is used to put a pop mark into steel for future reference for datum points and acting as a centre for accurate drilling to stop the drill from slipping.
Permanent black marker for marking dimensions onto a cleaned chassis, leave a job overnight and it’s surprisingly easy to forget your measurements.
Holesaws for metal, kits are cheap enough and most cordless drills will power them at slow speeds.
Several magnets, these are very useful for holding repair sections in place, particularly for invisible repairs.
Combination square, only buy the 12” /300mm version with a cast iron head, not the cheaper aluminium headed type, the better quality cast heads cost much more but will last a lifetime. These act as set squares for accurate angles and as the rule slides you can have as little or as much protrusion as you like to get into awkward spaces, or you can set the length for repetitive depth markings.
Various clamps and bits of metal such as stout angle iron for marking out or bending metal.

Spreader bar and large heavy duty ratchet strap – if you replace a crossmember the chassis may distort and if it closes up you open it up with your spreader bar, if it opens up you close it with your ratchet strap, or you can use both together for a very accurate positioning.

Making a spreader bar is easy, take a piece of 1” steam pipe 6”/150mm shorter than the distance between your chassis rails, get some 20m threaded bar and nut, weld the nut centrally and squarely onto one end of the pipe. Cut 12” / 300mm of threaded bar and carefully grind two flats on one end wider than the jaws of a 12” adjustable spanner, make 2 square sections from 5mm or thicker plate at 50mm square, weld one centrally onto the opposite end of the pipe to your nut, then weld the other one to the end of your threaded bar with the flats on, these spread the load on your chassis. Screw your 20mm bar unto the nut and down into your pipe, wind it out and use a 12” adjustable on the flats to wind the thread out to spread your chassis.

Basic chassis repairs:

We have all seen the bodged chassis repairs where someone has thrown on a plate over corroded metal and attempted to weld it and the weld looks like what is known in the fabrication profession as pigeon poopie, this is where lumps of metal are along the weld, but it hasn’t welded properly.

Making an invisible repair involves more work, but not much more, in addition it removes the corroded metal and leaves only good metal and as we all know the only way to get rid of rust is to remove it.
Clean your chassis in and around the vicinity of the repair using your angle grinder fitted with the wire brush as this will remove both paint and underseal; ensure you clean a good area around the affected area of your repair. Swap your wire brush for the backing pad and a fine resin bonded disc and go over the area as this will buff it and lightly grind it, do not use too much force on it.

Mark out the area with your combination square and steel rule in either a rectangle or square, ensure you scribe the lines on accurately. Place a piece of angle iron on a line, clamp tightly, and use this as a guide to rest your slitting disc on for an accurate cut, change your resin bonded disc for a slitting disc. Start your angle grinder and lay the disc flat onto the angle iron and slit into your chassis, keep your slitting disc flat to the angle iron and slit one way to the end of your cut, then go the other way, repeat with the opposite line and you now have your top and bottom slit. Repeat at one end cut leaving three sides cut, then pull the slit end of the metal out and put a piece of plate behind it holding it in place with a magnet, then set up your angle iron and do your final end cut and your cut piece won’t fall inside your chassis and you won’t be digging about inside a chassis rail to recover a hot and sharp piece of metal. You will have either a perfect square or rectangular hole in your chassis.
Cut your repair section from your repair plate, use your angle iron as a guide as you did cutting out your chassis, offer it into your hole by putting two magnets on it, one either end, and ensure it’s a snug fit, If the cutting of the repair piece isn’t accurate then sandwich it between two pieces of angle iron. Leave only a slight protrusion and using a fine resin bonded disc you flatten the edge of the repair section down to the angle iron for a perfectly flat surface. Repeat until the repair section is a good fit.
Insert the repair section into the hole in your chassis and use your magnets to position it squarely into the hole, use very thin sheet steel to pack if necessary, once aligned you tack weld one top corner with a small tack and check your alignment. Ideally you want a gap of 0.5-1mm between the new metal and the chassis for full weld penetration. Tack the bottom corner on the same end and then the middle at that end, work along the top and bottom seam alternately placing tacks every inch or 25mm, this equalises the heat to minimise distortion, if you keep a wetted cotton cloth you can dab the welds to cool them. With the repair section fully tacked in place you seam weld round it, allow to cool, grind the welds flush with a coarse resin bonded disc and finish with a fine resin bonded disc for a full strength, invisible repair, and all your corroded metal is removed.

Through The Chassis Mountings

Many items require through the chassis mountings and these may be side steps or tow bars, if you just drill a hole right through and push a bolt through and tighten it up then it will crush the chassis, where tow bars are concerned they are subject to a lot of load and a failure could be fatal.
Through the chassis mountings are simple to make and install properly and all that is needed is to install a tube right? No, you need to install a tube and spreader plate to spread the load. Measure the width of your chassis and add the thickness of both your spreader plates to this measurement, if we assume your chassis is 100mm wide and you intend using a spreader plate of 3mm thickness your tube length is 100mm + 3mm + 3mm as this is the thickness of your chassis and the thickness of your inner spreader plate and the thickness of your outer spreader plate. I would also add another 3mm to this to allow for any chassis distortion.

Remember: you can always grind a bit off, but you cannot grind a bit on.

For basic or low loadings through the chassis mountings we need a steel tube with a bore large enough to take the bolt of your prescribed size and two spreader plates of 3mm thickness. Cut two plates 50 X 50mm square or 60 x 60mm square depending upon the outer diameter of your tube, scribe across then from corner to opposite corner to find the centre, centre pop the centre where the lines intersect and drill a hole large enough to clear your tube. Add up the thickness of your chassis and spreader plates plus another 3mm and cut your tube to length, chamfer one end of the tube to give weld penetration and set the tube in a vice, insert one of the spreader plates over the end and weld on squarely and grind flush.
Mark out your chassis for your mounting point and ascertain your tubes outer diameter, mark one side of the chassis and centre pop the hole centre, transfer that down using your combination square to the bottom of your chassis, across the bottom, and up the other side of your chassis. This should give a reasonably accurate marking to centre pop the mark on the opposite side of your chassis.

NEVER MARK ONE SIDE OF YOUR CHASSIS AND ATTEMPT TO DRILL STRAIGHT THROUGH AS A COUPLE OF DEGREES OFF SQUARE WITH YOUR DRILL WILL HAVE THE HOLE ON THE OPPOSITE SIDE OF YOUR CHASSIS MILES OUT, AND OFTEN YOUR DRILL WILL WANDER ANYWAY.

Now we need to find the centre of the hole for accuracy in installing your tube, to do this we make a couple of datum points by taking our combination square and scribing a line from the top to the bottom of the chassis ensuring it passes directly through the middle of the centre popped mark. We do a second line at 90 degrees to this first datum line using our steel rule ensuring it passes through the middle of our centre pop mark, and ensure these cross hair lines are longer than the spreader plate.

With both sides of the chassis marked, centre popped, and datum lines scribed we drill the holes, but never drill a hole just large enough to accommodate our tube diameter, we make it around 3 - 5mm larger, hence our Holesaws. By cutting the hole for the tube larger than necessary we have adjustment in the hole to allow for slight inaccuracies.
If you take your spreader plate welded to your tube and measure it along each flat side and mark it then place a scribed line from side to side, and top to bottom they should pass through the centre of your tube, repeat this on your loose spreader plate.
Install your spreader plate with tube through your chassis, if you line up the datum marks on your spreader plate with those on your chassis the centre of your tube will be exactly on your centre popped mark, fit the loose plate on the other side and align this and clamp them both. You grind off any protruding tube flush with your spreader plate, remove both plates, grind a bevel or chamfer on the end of the tube and reinstall, tack the spreader plate with the tube attached to your chassis; tack the tube on the opposite side to the loose spreader plate and weld. Now weld both spreader plates to the chassis and grind the tube welded to the loose spreader plate flat with a fine resin bonded disc.
You now have a through the chassis tube perfectly aligned and structurally sound.

For heavier loadings you simply follow the above procedure and make your tube from thicker wall material and use thicker and larger spreader plates.

Crossmembers

Crossmembers are often the hardest things to replace as many people feel they lack the necessary skills to make new crossmembers, or feel it may be too difficult to fabricate new items and install them correctly.

Datum points are the essential component of any crossmember replacement as these are what provide the accurate alignment of the chassis if it moves, and datum points are easily dealt with if we know how to create and use them. Before we remove any crossmember we create our datum points using our combination square, accurate measuring and a centre pop. We do this by creating two centre pop marks on exactly the same position of both chassis rails and two pop marks at the exact centre of the crossmember on each chassis rail.
Measure the exact centre of your crossmember and scribe this on the underside of your chassis rail, repeat on the other side, measure at least 12” (300mm) front and rear of this line on one chassis rail on the underside and using your combination square mark it right across the underside of your chassis rail. Repeat this on the other side on the chassis rail.
You should have three scribe lines running across each chassis rail at equal distances, measure the width of your chassis rail and set your combination square to exactly half that distance, working from the OUTSIDE of each chassis rail you mark across each scribe line at 90 degrees. This should leave you with three X markings on each chassis rail; at the intersection of these marks you carefully centre pop them leaving you with three centre pop marks on each chassis rail. You now measure them.
Begin be measuring from the left hand chassis rail front centre pop mark to the front centre pop mark on the right hand chassis rail and note the measurement, repeat at the centre and rear centre pop marks.
Now we cross measure, we measure from the front centre pop mark on the left hand chassis rail to the rear mark on the right hand chassis rail, and then from the rear centre pop mark on the left chassis rail to the front mark on the right hand chassis rail and note these measurements. Always take these dimensions as they are crucial to alignment of the chassis rails upon installing the new crossmember.

If your crossmember is a straight section such as a box section or tubular section you simply obtain a new piece of steel box section or tubular section of the correct size and cut to length, cut oversize by about 1-2mm as you can always grind a bit off but you can’t grind a bit on. If your crossmember isn’t the same height as your chassis rails you will need to measure the height of the crossmember from the bottom of the chassis rail to the bottom of the crossmember and note the measurement.

You now cut out the old crossmember using a slitting disc by working round it, cut carefully and ensure you wear goggles at all times while cutting or grinding. Fit a coarse grit resin bonded grinding disc and grind off anything the chassis, swap for your wire brush and clean the entire area.
Once the area is cleaned of all the old metal it’s time to examine the chassis, often they contain a hole inside the crossmember for initial protection inside the crossmember from the factory applied corrosion inhibitors, if it has such a hole it needs filling flush to the chassis. Never weld a plate over the top as this can impede you when you install the new crossmember cut to the exact length and try to slide it in, this will make you force the chassis apart with your spreader, which is unnecessary work.

With your chassis cleaned and plugged you need to prepare your crossmember for installation and most crossmembers have holes or slots cut in them, if you have services installed through your crossmember you have to replicate them. In addition many manufacturers fit holes or slots in their crossmembers and it is prudent to do the same. Where services pass through it is prudent to install either tubes or other hollow sections and seam weld them in, if you have no services then you need a couple of drain holes. I prefer to drill a couple of 12mm holes at each end of the crossmember near the end on the lower side, but not too near the end to impede the welding, and another 12mm hole in the top centre of the crossmember, it is now ready for installation.

To install you need to get the crossmember in position, if it is smaller than the chassis rail section I clamp packing to the chassis, the crossmember sits on top of this packing, you now do the crucial bit and this is check all the datum point measurements. If the chassis rails have closed up then you need to spread them with your spreader you made earlier, if it has splayed you have to close it up with your ratchet strap, but take extreme care with this stage and take the time to get it right. Once your crossmember is installed and the datum point measurement points match its welding time, always seam weld these types of crossmember in. At this point I apply a good coat of industrial paint to the outside of the crossmember and let it dry, once dry I wrap masking tape around the crossmember to cover the two bottom drain holes, I then pour old engine oil in through the top hole until the new crossmember is full of oil. If this is left overnight it will coat the unexposed sections of chassis rail and the inside of the new crossmember, leave overnight and pull off the masking tape at one end and drain the old engine oil into a bowl, you now plug all three holes with 12mm grommets.

If you have a standard section crossmember which is shaped and not straight it becomes useful to buy the section you require, you then take a piece of plywood and draw your crossmember onto it. I do this by placing a straight edge across the bottom and one at the top, measure between them and you have the maximum height, place your section inside this and scribe along the edge from your top line and from your bottom line. Measure to the centre of any bend and translate this onto your plywood, this will give you your angles, put your section inside it and you will have a full size drawing of your section and a template to set it out.

Where you have an angle you measure an equal distance say 6” (150mm) along the outer lines and mark them, take your combination square and set it flush on your line at the marked point and scribe a line at 90 degrees to the outer lines on the inner edge of the angle, NOT the outer of the angle. Where these lines intersect you take a straight edge and run it through this point and the outer line of the section lines you marked and this gives you exactly half the angle, these are the datum lines.
Place your section onto the plywood and using your combination square you follow these lines and scribe them onto your steel section to give you the exact cutting angle for your joints, scribe this all the way round your steel section and cut this angle using your slitting disc and a straight edge on your section. You now have your first angle cut so lay this back onto your template and align the cut end onto your angle datum line, scribe your next angle datum line exactly from your template, repeat as for your first cut and you have your first piece cut and your next angle cut on your second piece. Align this cut end to the first piece on your template and mark the uncut end, repeat until you have all the pieces cut and line them up on your plywood template and everything should match, if it doesn’t then fine tune with your grinder.

With everything perfectly aligned on your template you tack everything together and check it hasn’t pulled out of alignment, turn it over and tack the opposite side and place it back onto your template and check alignment again, once perfect you weld it all together. Finish by drilling any through holes as previously described and you have a jig built and perfectly aligned crossmember, fit as above.

If you want a shaped crossmember fabricated from lighter material you follow the same procedure for making a template in plywood, but you cut it out and copy this template onto your sheet metal, do this twice for both the front and rear shaped sections of your crossmember. On the top section you need internal flanges so on any straight sections you add a 6mm wide piece to form this flange, if the bottom is flanged then add the required amount on the bottom of your shaped section to form a flange.
Place both shaped sections between two stout pieces of angle iron in a vice, if your vice isn’t deep enough to accommodate your shaped sections you move your angle iron one way so your vice only clamps one end, you clamp the other end of your angle iron with a good clamp. Ensure both pieces of shaped crossmember section; and both pieces of angle iron are perfectly aligned, drive a metalworking chisel between the two pieces of crossmember to open them slightly, move the chisel along these sections and form an opening all the way down their length. Repeat this moving from end to end until the two flanges are far enough apart to use just a hammer on them and work slowly from end to end of the flange, never hit too hard or work too quickly as you will stretch the metal and you want to avoid this. Once the long flanges are formed its time the shorter flanges on the angles, set them up in your angle iron as you did for your long flanges and form in the same way and repeat for the opposite angled section, you will now have two shaped sections of crossmember handed, with flanges.
Measure along the top edges and add a couple of inches, measure the width of your crossmember and cut this piece of flat strap from your sheet metal, mark the middle and scribe a line across, take one of your formed and shaped ends and place this on the centre mark with the flange facing inwards. Align and put a tack on the inside edge of the flange, get your second shaped section and repeat, you will now have two shaped ends tacked to the flange on the inside of the forming box section. Put the whole assembly upside down on a flat bench and work down the inside of the section tacking the top plate to the flanges, once you reach a radiused corner you turn the assembly over and fold the top section over tightly and tack on the outside. Once you have formed the radiused section you turn it over and continue working in the inside tacking the top plate to the next section of flange inside the crossmember, then repeat until the top plate is fully formed and tacked.
Seam weld the entire assembly by starting on the inside and welding the top section to all the flanges, carefully weld the insides of the corners where there is no flange, turn over and seam weld the outside. Fit the bottom plate and seam weld, drill any drain holes or holes for services, install.


Many people have issues with captive nuts on older vehicles and we have two simple solutions to rectifying these.
The solution is the pronged Tee nut and these are designed for wood, when you bolt together your new bed it is the pronged Tee nut which holds your bolt, and these come in M6 or M8 thread sizes as the popular and cheapest sizes, but you can get M5 or M10 thread sizes.

http://www.toolstation.com/shop/p41724#item_detail

Take your angle grinder and slitting disc and carefully cut off the prongs, grind flush if necessary, drill a hole in your chassis in the exact position of your captive nut to take the centre or tubular section of your Tee nut, countersink if necessary, insert nut, weld in and grind the face flush. Allow to cool and run either an M6 or M8 tap down the thread to clean out.

For heavier duty captive nuts, or to replace nuts which have stopped being captive and spinning we use another method, this is the holesaw and connector nut approach.

http://www.toolstation.com/shop/Screws+Fixings/d90/Nuts+Washers/sd920

Connector nuts are basically standard sized nuts, just a lot longer; they are designed for connecting lengths of threaded bar together when they are used as hangers for industrial equipment and come in M6, M8, M10, and M12 as standard sizes although they are available in other sizes at a price. For a new installation we decide upon our thread size and mark out the chassis and centre pop the hole and extend our markings beyond the diameter of the holesaw, centre pop one of the datum lined on the inside and outside of the cut for reference upon installation. Drill the hole and this gives you a core of steel from the chassis in the holesaw, remove and hold, drill out the centre hole formed by the holesaw pilot drill in your slug, which is usually 6mm to the desired size to clear your bolt size. Normally I use 7mm for M6 bolts, 10mm for M8 bolts, 12mm for M10 bolts, and 13mm for M12 bolts.
On the opposite side to your centre pop mark on your datum line you clean using your resin bonded disc, clean one end and sided of your connector nut as most are BZP coated, align the nut squarely on your slug and tack weld, turn over and ensure the hole in the connector nut is aligned squarely to the hole in your slug. Once you’re happy with the alignment you seam weld the connector nut to your slog and allow to cool; place the slug back into the hole and align the centre pop mark and the datum lines, hold with magnets and seam weld back in, you now have one captive nut with plenty of thread. Allow to cool and grind the weld flush and run a tap through the connector nut as welding them often closes them slightly and screwing in a bolt can damage the thread.

To replace a captive nut which is damaged we use basically the same procedure, for 6mm threads we can leave the 6mm pilot drill in, but for 8, 10, and 12mm threads we have several options. My preferred option is to drill a bolt of the same size thread as the hole in the lathe at 6mm down the centre, screw this into the nut until finger tight and grease your pilot drill and insert into the 6mm hole down the centre of your bolt and cut your slug out of your chassis. Recover the slug and grind off the nut and any captivation, replace with a connector nut, and proceed as above; you will now have a new, fully welded blind nut which will never come loose again, and with plenty of thread.

If you find the connector nut is too long then cut a bit off after welding to your slug.

If your connector nut is in a prone area and fills with dirt then simply obtain a grub screw of the same thread, screw in a few threads on the end inside the chassis, tack weld in position before installing the slug back into the chassis; and you have a fully sealed blind nut.

Some links to view some of the listed items.

http://www.toolstation.com/shop/Power+Tool+Accessories/d80/Holesaws/sd1530/M3+BiMetal+Plumbers+Holesaw+Kit/p69157

http://www.toolstation.com/shop/Power+Tool+Accessories/d80/Cutting+Discs/sd1750/Flat+Metal+Slitting+Disc/p35514

http://www.toolstation.com/shop/Power+Tool+Accessories/d80/Power+Sanding/sd1790/Fibre+Sanding+Disc/p83897

http://www.toolstation.com/shop/Power+Tool+Accessories/d80/Power+Sanding/sd1790/Fibre+Sanding+Disc/p18850

http://www.toolstation.com/shop/Power+Tool+Accessories/d80/Buffing+Polishing/sd2694/Rubber+Backing+Pad/p44509

http://www.toolstation.com/shop/Power+Tool+Accessories/d80/Wire+Abrasives/sd1920/Wire+Twist+Knot+Cup/p35654

http://www.toolstation.com/shop/Hand+Tools/d10/Carpenters+Tools/sd150/Combination+Square/p15803

http://www.toolstation.com/shop/Hand+Tools/d10/Punches/sd3302/Centre+Punch+Set/p96658



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roamingman
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PostSubject: Re: Repair Your Chassis Properly   Thu Nov 13, 2014 9:08 am

Thanks for anther great post, am thinking of trying a bit of welding, clinking teacups
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PostSubject: Re: Repair Your Chassis Properly   Thu Nov 13, 2014 9:40 am

You didn't mention filling the holes with newspaper and slapping on a bit of filler and underseal! That said I'm old school, they probably use expanding foam now. How times have changed. No

Yep, another comprehensive post from the Ass man. clapping2


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PostSubject: Re: Repair Your Chassis Properly   Thu Nov 13, 2014 12:25 pm

Welding newspaper, filler, and expanding foam is a bastard, never get any penetration.
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PostSubject: Re: Repair Your Chassis Properly   Mon Dec 01, 2014 1:35 am

Assassin wrote:
Welding newspaper, filler, and expanding foam is a bastard, never get any penetration.


yea but when everything is burnt to the ground your problem is then....gone..... stupid

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PostSubject: Re: Repair Your Chassis Properly   Mon Dec 01, 2014 6:23 am

Nah, the problems begin, a fine for pollution, a pile of scrap metal you have to move, and the greens using it against 4X4's.
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