Project-Zero: Ignition Barrel Replacement

GBS sent along a new ignition barrel to replace the one that came from the donor steering column. Replacing it is pretty easy if you have the original keys, I didn't.

Barrel removal if you have the original keys:

1. Insert key into the ignition, turn to position "II".
2. Press down on the small brass pin with a pick or a punch.
3. Gently pull & wriggle the barrel out of the steering column.

Barrel removal if you don't have the original keys:

1. Research "Tibbe lock picking" on Google, watch YouTube videos on the topic.
2. Order a Tibbe lock picking tool and wait for it to arrive.
3. Fail to pick the lock with the Tibbe lock picking tool.
4. Drill out the brass pin with a 5/32" drill bit, then go to town with a hammer and screw driver.

Installing the new barrel:

1. Insert key into the new barrel, align it so that the key is on "II".
2. Insert the barrel into the steering column while pressing down on the brass pin.
3. Have a cocktail.

Project-Zero: Sorting out diff mounting.

Some notes:

• The installation Order of Operations for the diff are
• Loosely install lower rear cross-bolt and spacers in the differential.
• Lift differential in to cat nose/flange first, loosely bolt-in the nose.
• Lift differential rear, insert the upper rear bolt.
• Torque everything to spec.
• Spacers are required:
• After a little trial and error I found that I need 15mm spacers.
• A stack of 6 M12 washers pack out to ~14.5MM.
• McMaster-Carr sell M12x15mm aluminum spacers

Project-Zero: Proportioning Valve Installed

Future proofing the build a little bit, I've installed a Wilwood proportioning valve between the master cylinder and the rear brakes. This will include a remote adjustment knob somewhere on the dashboard or center console.

In the process of installation I replaced the whole front-to-rear line which I'd completely mangled.  Made a small notch in a body panel for brake line clearance. Installed a 6" strip of clear door edge trim to keep from abrading the remote reservoir supply line to the master cylinder's rear circuit.

Project-Zero: Figured out what was wrong with the right rear suspension.

I've been having some issues getting the right rear suspension put together. The upper and lower control arms just wouldn't line up correctly with the upright. It was a very perplexing issue to encounter but it's getting sorted out now.

I after shooting photos back and forth with Richard at GBS we're pretty sure we know what's going on. First, there's nothing wrong with the mounts on the chassis. That's a huge relief. Second, there's nothing actually wrong with the dimensions of the upper control arm. It turns out I was sent two left upper arms, one of which has an incorrect shock mount bracket denoting it as a right side control arm.

GBS's Ford-style upper rear control arms are the same part left and right, just flipped over with a different shock mount bracket welded on; right-and arms have a notch on the shock mount. Flipping my right-hand arm over proved a notched bracket had been welded to an arm jigged up in left-hand orientation.

I've got a hypothesis for what happened. When GBS produced a set of Ford-style upper rear control arms, a notched shock mount was accidentally welded onto a left-hand arm. After powder coating, the arm was placed into inventory as a right-hand arm because of the notched bracket. It was just dumb luck that the wonky arm was pulled from inventory for my Zero kit.

I'll consider the issue closed as soon as I've got a new actual right-hand arm bolted up to the chassis. (GBS should be shipping it out to me on Monday.)

Project-Zero: Brakes, Differential Test Fitment

Brakes/Clutch Plumbing

The brakes and clutch use a common dual-outlet reservoir, which I kind of like. The front/rear brake circuits need to be plumbed into one of the outlets with a T or Y adapter, the clutch master cylinder requires a 7/16" to barb adapter and plumbs into the other reservoir outlet.

I've chosen to plumb the brakes to the side of the reservoir where the fluid level sensor is located.  I also decided that I wasn't happy with the routing required by the use of the GBS supplied 'Y' fitting so I bought a 5/16" nylon T fitting at OSH.

Presently waiting for a proportioning valve to arrive before I commit to remaking the rear brake line. More on that later.

Clutch Fitting

It's not easy finding a 7/16" UNF to 5/16" barb fitting, GBS supplied one in the inventory of parts for my car but I've misplaced it.  I sourced a replacement from Pegasus Racing. They also have a banjo style fitting that I may swap to if the vertical fitting doesn't work as well as I would like. (I don't think that'll be a problem, however.)

Differential

The differential is a 3.6:1 LSD from a Ford Sierra, it fits in the chassis well enough but I'm going to need to fabricate some spacers.  The mounts on the diff case are 7" wide, the chassis brackets are 8.25" wide.  This means I'm going to need 15.5-16mm spacers to center it up in the chassis mount.  I'm going to see if I can get away with printing them in ASA with 100% infill.

Project-Zero: Brake nuts, rear studs.

Front Brakes

I found that the threads of the tube nuts installed on the front brake lines at the GBS workshop were garbage, wouldn't thread on to the GBS supplied ATR braided flexible brake lines. Some other owners have run into the same issue, they've resolved it using an M10x1 tap to clean up the threads. I opted to replace the tube nuts, I was able to steal a good set from a friend's build. 

Rear Brakes

Rear brakes were zero dramas, everything there was fine.

Rear Hub Studs

With the use of a 20-ton press, I installed a set of ARP wheel studs in the Sierra rear hubs. I wanted to use ARP studs to match the style of studs in the front hubs. Turns out that ARP's NA/NB Miata/MX-5 extended wheels as almost a perfect, especially with the use of a 20-ton press.

Project-Zero: Steering column is in.

The steering column is in the car, for now. I don't think it's going to need to come out again any time soon. A bunch of tubes of torque seal arrive this week so hopefully I can start torquing things down this weekend.

The sierra column is, in theory, height adjustable but in application for this car might as well not be. In its highest possible position there's only a few millimeters of clearance between the triangular section of the steering column and one of the under-scuttle frame rails.

I've mounted the steering column in place with Class 12.9 M10x1.50x30mm (x2) socket head cap screws and Class 8.8 M10x1.50 nylock nuts.  To help spread out clamping force, I have used 30mm OD M10 washers on front face of the column mounting bracket. These fasteners are absolute over-kill and shouldn't be torqued to more than Class 8.8 M10 threadlock/lubricated spec.

The battery location is great! The Odyssey PC680 fits [almost] perfectly. This battery was damaged in shipping, a new one is on its way. Which reminds me, I should print some terminal protectors.