Distributor Gear and Parts Fabrication

I need to swap the distributor gear to be compatible with the cam gear. After driving the roll pin out, I used the TechShop’s arbor press to press the gear off.

I had to use some scrap metal to shim the bolster plate up high enough to give me clearance to press the shaft down. I also had to remove the rotor and upper housing to allow the distributor to fit between the legs of the press.

With the old gear pressed off, I needed to drill the new gear to match. I set up a duplicating rig on the mill.

Four clamps around the side precisely locate a v-block in the vise.

The shaft of the gear sits in the groove of the v-block and is clamped against the forward face of the vise using a couple of clamping nuts. The critical reference measurement on the gear placement is from the lower face of the gear (the one clamped to the forward face of the vice), so this arrangement will make the hole the exact same distance from that face. I adjusted the table so that the 1/8″ bit would slide all the way through the old hole without any side load. I then loosened the vise and swapped in the new gear.

The new gear is on the right and the hole turned out perfect. All that’s left is to press the new gear onto the shaft and somehow figure out how to align the holes. If I can’t get the holes aligned, I can always press it on 90º off from the existing hole and drill a new hole through the shaft.

Next up is to trim the ignition coil mounting plate. After cutting it to rough size on the band saw, I mounted it in the milling machine vise. I used some shims to mount it at an angle since the mounting legs are asymmetric.

After machining and some finish sanding, I polished it up a bit on the scotchbrite wheel. After I drill the mounting holes and confirm the fit, I’ll polish this until it’s as shiny as the water pump.

Finally, I cut the electric power steering mount apart so that I can reweld it at the proper angle.

I sanded off all of the welds and cleaned up the edges.

The channel hung over the 3/4″ tubing by just over 1/8″, so I machined off the flanges to align with the face of the 3/4″ tubing when welded.

Steering and Ignition Coil

The first step in installing the electric power steering (EPS) system is to cut the steering shaft. I ended up moving the electric motor back almost as far as it could go and then taking some measurements from the engine mount to ensure I’ll have plenty of clearance.

I just started with a single cut in the shaft because this would let me adjust the motor up or down from there, but it looks like this spot will work absolutely perfectly. I really can’t go back any further because I’d hit the steering shaft u-joint and I’d interfere with the exhaust headers which exit just aft of here.

After determining everything will fit nicely, I cut the other end of the shaft and test fit everything.

The bracket that came with the system isn’t welded at the right angle to allow the motor bracket to bolt up to it. I’ll let Erik know, but I’ll probably just cut and reweld this myself.

The motor clears the F panel by over 1/8″. This bracket isn’t used in this application, so I may just cut it off.

After hunting around for a good place to mount the EPS controller, I decided to mount it to the 3/4″ tubing behind the steering shaft. There’s nearly 1/4″ of clearance between the shaft and the controller, and it’s really out of the way here. The challenge is that there are only two threaded bosses on the EPS controller and they’re at an odd angle. I need to be able to access the screws later in case the controller needs to come out. Mounting it here lets me fabricate a simple bent steel bracket and easily access the mounting screws if necessary.

I ended up deciding to mount the ignition coil to a custom bracket that will bolt to the front of the water pump. I had a piece of scrap aluminum angle, so I took some measurements and laid out the shape of the bracket.

Once I cut out the bracket, it will bolt to the front of the water pump using these two bolts. This should clear everything around it and provide a nice, short run from the coil to the distributor.

Turned Spacers for Struts and Alternator

I needed to make custom length spacers for the struts and alternator mount, so I stopped by the TechShop after dinner to turn them on the lathe. I ordered a 2″ spacer from March Performance that is already powdercoated, so I wrapped it with some tape to protect the finish. I turned this down to 1.745″

I need spacers of a bunch of different lengths for the struts. I picked up some 0.509″ ID tubing with 0.058″ wall thickness from McMaster Carr and rough cut them on the chop saw about 0.100″ long. I then turned down each end to make them perfectly square and the right length.

Trimming the spacers leaves a burr on the inner edge, so I repositioned the cutter and trimmed it off of each end of all of the spacers.

Here are the finished spacers. I’ll powdercoat these when the car comes completely apart for chassis finishing, but for now I’m going to install these bare.

Afer I got home, I installed the alternator spacer.

I installed it along with the oil dipstick tube. The bottom of the tube is installed with a little bit of black RTV to prevent oil leaks.

Installed Pedal Box

Jenn’s been sick since we got back from vacation. She’s disappointed to not be able to work on the car, but she wants to see some progress, so she’s been fine with me working on the car alone the last few days.

Next up is to install the pedal box. The complete kit comes with the Wilwood pedal box that contains the brake and clutch pedals. The brake pedal is set up to depress two master cylinders (one for the front brakes and one for the rear). The clutch pedal can use a master cylinder for those (like us) who are using a hydraulic clutch, or it can be configured to use a clutch cable for those running a manual clutch.

Both the clutch and brake pedals have switches installed so that systems can know when they’re depressed. The switches are mounted to tabs that need to be installed on the pedal box. To drill the holes, I clamped the tabs to the opposite side of the mounting flange since there is no room to drill from the other side. If you do this, don’t push the tab all the way down against the adjacent side flanges since they slope up toward the pedal and the hole won’t be aligned when you move the tab to the other side of the mounting flange. I just eyeballed it and it worked out great. You can see the right tab is already mounted and the left is ready to be drilled.

Once the tabs are in place, the switches can be installed. I’ll adjust the offset for these once all the systems are hooked up.

When I tried to install the pedal box in the car, two of the screws that I installed yesterday interfered. I removed them, installed the pedal box and then drilled through this flange. After removing the pedal box, I enlarged these holes to provide clearance for the screws (and eventually the rivet shop heads).

After fitting the rear mounting plate, I marked and drilled holes through the lower 3/4″ square tubing. Initially, they landed almost flush with the edge of the tubing. I couldn’t drill the holes there since that would compromise the side of the tubing. I ended up shifting the holes over about 1/16″. There is enough flex in all of the components that they can absorb some offset. You just need to make sure all of the bolts are installed loosely before tightening everything down.

You can see that the clutch reservoir (closest in the picture) has a larger bore than the brake cylinders. After installing everything, I realized that the brake balance bar was misadjusted from the factory. I ended up removing one of the brake cylinders so that I could adjust the side-to-side clearance of the balance bar. After adjusting the balance bar, I threaded in the master cylinder shafts until the cylinders open all the way up when the pedals are released.

Plated Fittings and Received New Bolts

The water pump came with a couple of brass fittings for the heater hoses. We’re trying to keep the engine all black and polished metal though, so I decided to try plating the fittings. I picked up the tin-zinc plating kit from Eastwood a few weeks ago, but haven’t had a chance to try it out.

The kit is pretty easy to use and took only a few minutes per part to plate. As you can see, the parts look much nicer now.

The parts come out of the plating solution like you see on the left. A minute or so with a dab of the metal polish that comes in the kit shines it up nicely.

The valve cover bolts that came with the ARP engine bolt kit weren’t long enough. Apparently they’re intended for use with a stamped valve cover and cork gaskets. We’re using cast valve covers with thicker rubber gaskets, so we needed longer bolts. ARP was nice enough to exchange them for me and they arrived today.

The engine is all sealed up now and looks much better too.

We also got an order from Summit with some 2″ 3/8″-16 bolts, so I swapped out the hardware store bolts for them. We also got a longer spacer from March Performance, but I need to trim it down to the right length.

March Performance Pulley Kit

I ordered the March Performance 30380 pulley and bracket kit along with a 140A polished alternator. I probably don’t need anywhere near 140A of power, but the cost delta between the 100A and the 140A was small. These are really nicely machined pieces and everything except the alternator has been powder coated with clear. They don’t match exactly, but they all look good together.

The combination of the water pump we’re using and the Ford harmonic balancer necessitated a 0.875″ spacer between the harmonic balancer and crankshaft pulley. I made this determination without any of the parts on hand and happily it was exactly right. I bought a couple of hardware store bolts to attach this for now, but I have some 2″ ARP 3/8-16 12pt stainless hardware on the way.

When I first tried to mount the alternator, the output stud contacted the side of the cylinder head.

Fortunately, Tuff Stuff alternators can easily be reclocked. I removed the four bolts holding the case halves together and rotated the front case 180º and reassembled it.

Now the output stud has plenty of clearance. I’ll see if this puts it in an optimum location as the build progresses. I can always reclock it if another location makes more sense.

The tensioning arm attaches to a small bracket that bolts to the lower mounting lug. The other end of the tensioning arms bolts behind the alternator mounting bracket.

The spacer that March Performance ships is too short. I have a longer one on the way.

To ensure everything is lined up correctly, I installed the belt and tightened the tensioner a bit. It looks like it’s basically perfect. I really like this mid-mount position for the alternator (as opposed to the top-mount which has the alternator sitting on top of the pivot bolt instead of hanging below it). This leaves the water neck completely unobstructed and is totally out of the way of the timing chain cover mounted oil dipstick. It also leaves the ends of the cylinder heads exposed. Since we went to the trouble of painting the engravings, I really wanted these to be visible.

As you can see, there is a straight shot down to the hold in the timing chain cover for the oil dipstick tube.

It looks like a really convenient mounting spot for the upper end of the dipstick tube is the pivot bolt for the alternator. I’ll confirm with Jenn, but these doesn’t block anything else and leaves the tube about as close to straight as you can get it. I’ll install this with some RTV on the bottom once Jenn’s back in town.

Engine Off Assembly Stand

I assembled the storage stand and used the cherry picker to move the engine from the assembly stand to the storage stand. It’s unfortunate that we can’t bolt the bell housing and transmission in place while it’s on this stand since the rear supports bolt to the same flange the bell housing will bolt to, but it’s safer to store and transport the engine on this stand.

Work is going to slow down on the car for a bit. July is fairly packed with other things on the schedule, so updates won’t be as frequent for the next few weeks.

Engine Build

My aunt and uncle are in town this week at least in part so that my uncle could help us with building the engine for our Cobra. He’s done far more engine work than either my dad or I have and we thought it would be fun to all work on this together. We also scheduled this so that Jenn would be done with work and could assist with the build.

I put together a little video of the build, but I’ll also describe the process with pictures below.

 

First up was to install the front seal in the timing chain cover. I put a thin film of RTV around the flange to ensure a leak free installation.

I then used a seal driver to seat the seal in the cover. This was a surprisingly tight fit and required a fair amount of force to seat.

Next up is to install the water pump on the timing chain cover. We applied a thin film of RTV to the mating surface.

We installed the gasket and then applied a thin film on the other side of the gasket.

The water pump cover is installed and the upper and lower bolts are torqued.

We then applied RTV to the timing chain cover and gasket before mating it with the water pump.

There are a few bolts that attach the water pump to the timing chain cover. The rest go all the way through the timing chain cover and into the block.

My uncle applied some high-tack sealant to the timing chain cover seal.

The mating surface on the block gets another coat.

This stuff works like contact cement, so you have to let it tack up on both surfaces before sticking them together.

A second coat was then applied to the other side of the gasket and the mating surface on the timing chain cover.

My dad and uncle installed the timing chain cover and water pump on the engine and held it in place until I could get a couple of bolts installed.

Jenn installed the remaining bolts…

… and then torqued them in three steps up to final torque.

We then flipped the engine and installed the oil pump and pickup.

Before installing the oil pan seal, I applied a thin film of RTV over the end seals.

I also installed a small blob of RTV at the intersection between the arch and flat section. I also put a thin layer at the joint between the timing chain cover and the block.

We then dropped the oil pan seal in place. I applied a thin film of RTV along the sides of the arches to act as a lubricant to allow the oil pan to slide into place without distorting the seals.

We then installed the oil pan and torqued the bolts to spec.

With the bottom end of the engine done, we flipped the engine over and installed the head studs. These get lightly torqued into the block (about 3-5 ft-lb). Jenn also dumped 7qts of oil into the lifter valley where it will drain down into the pan.

We then dropped the head gaskets into place. I had previously trimmed these to exactly follow the edge of the heads so that they don’t hang out.

With help from my dad and uncle, I installed the first head and Jenn installed the second.

We took turns torquing the head bolts in three steps up to final torque.

My uncle dropped in the lifters…

… and I dropped in the pushrods.

We pulled all of the rocker studs to install the adjustable guide plates. After visually lining up the pushrod, rocker stud and valve stem, we torqued the rocker studs back to 65 ft-lb. All of the intake studs need to be installed with thread sealant since they go into the intake port.

The visual approach lined up most of the rockers, but we had to pull a few and adjust the guide plates. After ensuring everything was lined up, we put 0.075″ of preload on the rockers and then tightened the set screws.

We didn’t get any pictures of the process of installing the intake manifold, but we installed RTV on both sides of the intake manifold gaskets around the water jacket and then some high-tack to hold the gasket in place. We then put a heavy bead of RTV on the end rails of the lifter valley and set the intake manifold in place. We then torqued the manifold to final torque.

Finally, we installed the lifting plate to seal up the manifold and then installed the valve covers.

Here’s the result of our long day of work. After this picture was taken, I taped up all of the open holes to keep dust out of the engine.

Ordered Struts and Painted Cylinder Head Lettering

I talked to FFR this morning and they confirmed that I could use either the upper or lower strut mounting positions. They offer two because the single and double adjustable shocks they include in the kit aren’t the same length. With the chassis at ride height, I measured the resting length for the front and rear struts using both the upper and lower mounting positions. I also measured the strut and spindle mounting distances on the lower control arms to compute the motion ratio. This gives me all of the information I need to compute the correct strut length, but I still need to decide on spring rates. FFR recommends 500lbs in the front and 350lbs in the rear, but from what I can tell, part of the reason for such high rates is that the Koni struts they include in the kit have very little remaining travel at the normal ride height and the high spring rates help prevent the struts from bottoming out. The QA1 struts have a greater range of travel, so I shouldn’t need quite as high spring rates. After a bunch of research, we decided that we’d start with 400lbs in the front and 250lbs in the rear. I’m assuming we’ll end up ordering additional springs when we’re dialing in the suspension down the road.

I spoke with one of the engineers at QA1 and gave him the dimensions I measured and spring rates. He recommended the following items:

  • D4501 quad-adjustable shocks, front and back. These have a travel of 11.625” – 16.875”.
  • 10HT400 springs, front. These are 10″ long; 12″ long springs would work, but they would put the ride height adjustment nut at the very bottom.
  • 10HT250 springs, rear.

He also recommended using the lower mounting holes on the front and the upper on the back which only have a 1/8″ difference in resting length. These items are all on order, so I should be able to confirm they fit some time next week.

With the measurements complete, I put the chassis back on the dolly.

One last thing I’ve been wanted to do before engine assembly is to paint the engravings at the end of the cylinder heads. I tried this earlier and ended up wiping off the paint because it wasn’t looking great. I tried a new technique tonight which worked much better. I cleaned the engravings thoroughly and then used a q-tip to apply paint over the engravings thick enough that I couldn’t see them. I then let the paint set up for a couple of hours and then used some solvent to remove everything on the surface. You can still see a haze of paint around the engravings, but that should come off with some more solvent. I didn’t want to go further tonight though since it would be easy to go too far and have the solvent remove the paint from the engravings. I made sure I did opposite ends on the cylinder heads so that if this doesn’t turn out well, I can just put these at the back of the engine and no one will ever see them.

Installed Front Brakes and Filled Differential

I got started this morning on the front brakes which are a little more of a pain than the rears. The bracket that holds the caliper on doesn’t fit the FFR spindles without some modification. After searching the forums, the consensus is to grind the spindle until the bracket fits. The only interference is with the upper mounting hole on the bracket, but that part of the spindle is super thick. I only needed to remove about 1/16″ of material, so strength is not compromised.

With the Big Brake kit from Levy Racing, there is very little clearance between the wheel and the caliper, so the caliper needs to be biased inboard a bit. The instructions from Gordon are to shim the caliper inboard enough that the outboard pad can just barely be inserted. I ended up using about 0.150″ thick shim to space the mounting bracket inboard which lets me insert the the outboard pad with about 0.012″ of clearance. Even though the gap is greater on the inboard side, this will even out the first time the brakes are applied. Since there are pistons on both sides, the inboard pistons will just extend a little more.

Wheel spacers are used to shim the wheels outboard about 0.090″, but that still only leaves about 0.040″ between the back of the spokes and the face of the caliper.  Since the calipers are rigidly mounted and don’t float like most OEM calipers, this is more than sufficient clearance.

The reason I wanted to get the wheels on now is that I need to measure for the struts. The manual says the chassis ride height should be 4.5″ from the ground to the bottom of the 4″ main tubes. I laid down three 2x4s and then set the chassis down on them.

I did the same thing in the front and then adjusted all four control arms to put the wheels at zero camber.

I put a couple of bolts in the upper and lower mounting brackets and measured for the ride height distance. It’s a little unclear whether the upper end of the shocks should bolt into the upper or lower hole.

I drained the differential in preparation for filling it with new fluid.

I was pleasantly surprised to see that both the fill and drain plugs both included magnets to catch any loose metallic particles floating around in the oil.

My dad brought over this contraption he made to fill transmissions and differentials. It hooks up to a compressed air source and then has a needle valve to control the air pressure in the canister. There is a pickup in the bottom of the canister that connects through a fitting to the tubing on the top. When pressurized, fluid is forced up the tube. The plastic canister can’t take much pressure, so it takes awhile to pump 2.5L of fluid up into the diff.