32J's MKIV Build Thread, Project "Serpente"
Build Plan
- MKIV Roadster, no donor car
- Coyote Gen 3 with Tremec TKX and Hydraulic Clutch
- IRS
- Power Steering
My Canadian base kit has been ordered and will be arriving by end of March 2021. Still sorting-out details for balance of parts needed within Canada.
Let the madness begin.
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Uncrating, Removing the Shell, and Positioning the Frame
This is my first ever build so forgive me if this old hat to the experienced folks, but I'd thought I'd share a few things I've learned so far:
1) If your kit comes in a crate, save yourself a $100 and reuse the OSB sheet and lumber to build your body buck.
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2) The manual is good, but not 100% accurate. You'll need a lot more than a just 5/8 socket to remove the shell.
3) If crated, the frame rests directly on the deck. You'll likely have to jack-up in order to fit a socket underneath and have enough room to remove the screws holding the shell to the frame.
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4) Manual doesn't mention this, but the front body mounts are attached to the frame with front quick jack bolts, but also mounted to the shell by the holes for the turn lights. Be sure to remove them from the shell as well, before lifting the body off the frame. Otherwise you may ding the frame or the powder coating.
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5) Wear gloves when handling the fiberglass. I did most of the time, and the one time I didn't a glass fiber stabbed my index finger like a needle.
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6) If you have a floor jack, an engine stand, strapping or slings, and some rolling platforms, you should be able to maneuver the frame off the crate deck. (Or, if you have 3 strong buddies just hanging around...)
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7) If you have wheel dollies, you can temporarily put your jack stands on them, and then lower the frame off your hoist. You can then roll the frame to your desired spot.
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8) Inventory all the boxes and parts, open every bag and little box, inspect, and count everything down to the washer and butt connectors. If you're new to this like me, it's a great way to start getting familiar with all the parts. If you come across something that you can't reconcile to a parts description, take a photo. Also cross-reference against the Parts Order (backorder) List, as not everything that is missing is necessarily captured on that list. As I verified every part, I highlighted the part and quantity in yellow on the parts list. If something was missing and not on the POL, I put a red dot beside it. And if it was something that I want to eventually powder coat, I put a blue dot against it so that I could quickly find it in the pile of boxes when the time comes. Once you inventory everything send a message to FFR (including pics of unidentified parts) and they're really good about getting back to you quick with answers and confirmation.
Whew! What fun weekend that was! Next step is to start removing the mounted panels.
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Cheers,
32J
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Installing IRS Differential
Whether you want to or you have to, it is possible to install the IRS differential yourself. You'll need an engine hoist, a chain fall, a floor jack or dolly, and at least 3 winch straps. With engine hoist, chain fall, and a winch strap, lift the IRS up from the front mounting arms. You may want to use a small chain or solid core wire to cinch the strapping to keep it from slipping off accidentally. Once the shaft end is high enough, use a second strap tied to the transmission tunnel bracing, to slowly pull the shaft coupling end down. Then use the 3rd winch strap to create a basket under the differential, and tied against the back trunk frame. You can use this strap to slowly lift the back end of the differential. From this point, it's just a slow dance of pulling the front down and lifting the back up, while also using the chain fall and engine hoist to adjust vertical position. The chain fall (and a dead blow hammer) is absolutely needed for fine adjustments in order to get the mounting bolts in.
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IRS Toe, Lower, and Upper Control Arms, and Spindle Installation
Whew! I thought installing the IRS was a challenge. Every single mounting IRS mounting bracket on the frame, or the spindle-end brackets, were too tight for the corresponding bushings. Even if the bushings are tight into the tubes, the metal pivot sleeves may be proud. In some instances the clearance in the brackets were up to 1/8" smaller than the width of the bushing/sleeve. Is this interference caused by the powder coating? Probably doesn't explain all of the interference. Maybe the distance between the mounting tabs shrunk after welding? Perhaps. Anyway, I'm not sure if there is an easier or smarter way, but I had to work with what I had.
With a machinists ruler or some locking calipers, measure the bushing/sleeve and then compare to the mounting bracket. Then use some 5/8" bolts and nuts, or some 1/2" threaded rod and some nuts, and thread them through the mounting brackets to create a power-screw to spread the tabs. If using 1/2" threaded rod you'll need a metal plate on one side of the bracket to keep the rod from going through the hole. Spread the tabs maybe a 1/16" to 1/8" to allow for spring-back after you remove the bolts or rod. You can then mount the arms to either the IRS frame or onto the spindles.
Does spreading the mounting brackets mess-up alignment long-term? I don't know. Everything looked pretty square and tight after I torqued the bolts to spec. I'm going to trust that alignment of the IRS arms can be adjusted and locked.
I admit that it took me a while to figure out the first one, and find the bolts, and cut some threaded rod to size, etc. This "nuance" (or "nuisance?" :p) added about 10 minutes to each end of the bracket. Overall it probably added an hour to the IRS assembly. Should this be added as a note in the manual?
Some photos:
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12.88" Wilwood Brakes and Safety Wire
Got around to installing the 12.88 Wilwood brakes. Some thoughts for newbies preparing to do this for the first time:
1) You'll need 12 point sockets for the hat to rotor bolts as well as the caliper mounting nuts. Start shopping to buy or borrow. My local hardware and home stores had very limited selection, and if they carry anything it's usually on the larger sizes and only one socket at a time... which is expensive. I ended up getting a set through Amazon.
2) Safety wire
- Debur / Chamfer
I was about to abandon the whole idea because the hat to rotor bolts are very close to the rotor ID, and it was very difficult to pull the wire through without nicks. I found a solution somewhere on the internet (may have been one of the forums... can't remember as it was late at night). The holes for the lock wire are very sharp, which is what catches the 0.032" SS wire. Use a Dremel tool with a small deburring bit or sharp-pointed sanding bit. For each rotor, go around all 12 bolts and de-bur or chamfer each hole for 2-3 seconds. A total of 48 holes per rotor. This made a HUGE difference in me being able to pull the safety wire through, especially if the hole was towards the ID of of the rotor. - Safety Wire Pliers
In addition to saving a lot of time, they also ensure tight and consistent twisting of the wire. For the 12.88" rotors, I found that 4 1/2 pulls of the wire gave the target range of 8-10 twists per inch. - Getting it tight
As you pull one end of the twisted wire through the 2nd bolt of the pair, getting it tight to the head of the bolt can be a challenge. I didn't have my rotors clamped down, so maybe that could have helped. But if you have small, NON-SERRATED HAMMER, gently tap the wire into the hole after you've pulled it as far as you can (tap and pull at same time). This slight impact action will get the wire snug into the bolt. - Length
For the 12.88" Wilwoods, I found that 10" of the 0.032 SS wire was about the ideal length to lock a pair of the bolts. So, 12 bolts per rotor / 2 bolts per pair x 10" per pair = 60" or 5 feet of safety wire per rotor. So you'll need at least 20 ft for a complete set of brakes. Give yourself some extra for practicing! I went through about 5' until I figured out the deburring / chamfering and tap method.
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Caliper Mounting
You'll have to mount and remove the caliper bracket, brake rotor/hat, and the caliper several times as you check for alignment and centering. I don't know if there is a better way to center the calipers, but this is what I did:
1) I used my digital caliper to measure the distance from the inside of the caliper to each side of the rotor.
2) Subtract the distance between those two measurements.
4) If the distance is MORE than the 0.029" shims used on the caliper mounting bracket to the spindle, then adding or removing a shim will make things better (depending on which side of the rotor the caliper was offset). If the difference between the two offset measurements is LESS than 0.029", then that's as good as it's going to get and the calipers are 'centered.'
5) I used the same method for installing the brake pads into the caliper, but using my digital caliper depth gauge to make sure the top of the pods were flush with the OD of the rotor. You can add or remove the 0.035" caliper bracket shims as needed.
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For the rear-end only, it took me about 8 hours for mounting the hats to the discs, safety wire, then mounting the calipers and parking brake calipers. Should go quicker for the front brakes when the time comes.
E-Brake Cables
I wasn't comfortable with how the recommended routing of the e-brake cables, under the 4" frame tube, came too close the bracket for the passenger seat-belt lug. Over time I could see the sheathing around the cables starting to wear through, especially on the sharp edge of the steel. See photos:
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So what I ended up doing was to take some spare 5/16" hose slit it down the axes, and slide it around the brake lines. Secured with zip ties on either end. There may be better ways to handle this, but I think this will work in the short term at least. I'll see how it holds up.
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Steering Rack and All Hell Brakes Loose - Steering Arms Upside Down!
Installing the steering rack went okay, at first. Had to use a strap to get the passenger side bolt into place. Had trouble getting the tie-rods into the steering arms. Turns out, I put them upside down. (I'm now part of the Steering Arm Club, apparently :p.) They may look symmetrical, but they are not. There should be an extra note in the manual, to indicate that the holes for the tie rod ends are tapered, and the larger hole should face down, so that the tie rod end can be inserted from the bottom. Manual only mentions the insertion from the bottom. For newbies like me, hard to tell with the naked eye that the holes are tapered. Live and learn, right?
Quickly learned that that there's no way to switch the steering arms without either a) separating the lower ball joint from the spindle, or b) pulling the bearing hub off the spindle. I tried the "just hammer the spindle on the side method" a few times, but that didn't work. And I was nervous about putting all that impact shock on the spindle castings and the front bearings. I tried a "universal" ball joint separator from Canadian Tire, but the max opening of the jaws was about 3/8" too small. And I really didn't want to take off the hub nuts, mostly because I believe you can only torque those things once (one and done). I would have to buy some new ones.
I'll skip all the stuff about removing the calipers, rotors, and front shocks. To separate the lower ball joint, this is what I did:
1) Loosen the lower castle nut, but don't take it off! When she brakes loose you want the nut to hold everything. I also sprayed a little Liquid Wrench down the stud and into the spindle casting, for extra juice.
2) Make a power screw using a bolt and nut. Cut it a bit short so that you can insert some steel plates or shims between the screw and the ball joint studs.
3) You'll need something like a vise grip wrench to hold the head of the bolt, while you use a crescent wrench to turn the nut up and slowly start to put opposing pressure on the top ball joint stud and the lower ball joint stud.
4) If it doesn't come apart after a few turns, (you may hear small creak as it breaks loose a bit), take a mallet or hammer and tap the side of the spindle a few times. If it still doesn't come loose, turn the nut of the power screw a bit more.
BANG! (Well, that's the sound mine made when they finally came loose.) What an ordeal. Anyway, switched the arms and got everything bolted back up, threadlocked, and torqued back to spec. The whole incident probably cost me about 8 hours. LEARN FROM MY STUPIDNESS! Test-fit the tie-rod ends in the steering arms before you bolt them to the spindles! ;)
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32J
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Wilwood Pedal Box Installation
Installed the Wilwood pedal box this weekend. I left about an 3/16" clearance between the brake lever and the cross member, and I set the clutch pedal to be flush or in the same plane as the brake pedal. I only really had two issues that I eventually fixed:
1) The total gap along the balance bar is supposed to be 0.20 to 0.25", while mine started at about 0.355". Took me a while to figure out how to get it down, to around 0.225". The master cylinder threaded rods now look parallel and operation is smooth and free of any obstructions or binding.
2) The brake switch plunger was not activated at all, even with the PAL nuts threaded all the way to the switch housing. Both PAL nuts are 0.175" thick, so I filed down the one between the switch and the mounting tab to 0.100". That did the trick. I checked the brake activation with my multimeter continuity, and the switch is activated on very slight press on the brake pedal, like about 1/16".
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Steering Shaft - Trimmed 0.193" Off Lower Shaft
Loose-fitted the steering shaft assembly. While keeping the lower shaft flush with the inside of the upper u-joint, the shaft stuck-out or was 'proud' of the lower u-joint bore by 0.193." At first I thought it would be okay, but I rotated the steering shafts through 360° and there was contact.
Others have said that they just mounted the foot box flanged bearing on the inside of the front wall, rather than on the engine-bay side as in the instruction manual. This wasn't an option for me, though, because the mount plate for the Wilwood pedal box would interfere with the flange and cause it to not sit flat against the wall.
So, I just took a cut-off wheel and removed 0.193" from the end of the shaft, filed it down smooth, and assembled it back into the u-joint. Tightened everything up and it all works fine.
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32J
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Footboxes and Cockpit Aluminum
Put the fuel tank on hold while I wait for the engine package to arrive. Started on the footboxes and cockpit aluminum.
For the passenger side transmission tunnel, I had to notch and file a bit more of the panel to fit the emergency brake bracket. I had opened the mounting tabs a bit so that I could get more clearance between the tunnel and the handle. As a result of these modifications, the factory panel was interfering in a few spots so I had to make some adjustments.
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I also put asphalt undercoating on the underside of the floor pans. I may yet do another full coating when it's done, but it's easier to do it before I put the tins down. I put the coating on first, then I removed the masking tape and finished with a coat of VFT Chassis paint.
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For the floors, I put the seat in each side and marked where the seat frame and cross bars would sit on the floor. I was sure to space the rivets so that the frame would not sit on the rivets.
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For the drivers footbox, it helps to cleco everything and then double-check your foot clearance. I tried with my regular hikers and with my skinnier Skechers. I ended up moving the Wilwood brake and and clutch foot plates to the left, to give my foot more clearance at the gas pedal. Overall, being 5'10 1/2" with 10.5 feet, the standard panel kick-outs by FFR that came with the MKIV will suit me just fine.
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One tip is for the drivers front footbox tin. If you're following the sequence in the manual, the front footbox tin goes in before the manual gets to the cockpit aluminum. When looking from the front of the car towards the footbox, don't rivet the top left (diagonal) part of the the front panel. Eventually (page 325 of the e-manual), you'll have to place the top of the footbox, and the flange tucks inside of the footbox front panel. I actually had to drill these two rivets out so that I could dry-fit and drill all the footbox panels.
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In the end, I think I did an okay job.
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