Jerky Clutch (new)???

[FoMoCo]

Hey all, my 67's clutch is really getting rough. It's a new Borg warner Brute Force. I noticed backing up that it would jerk/grab hard and shake the truck. Its now starting to jerk going forward. If I let out the clutch quickly it might spin the tires, to slow it jerks. The pedal assembly is part of the problem, but what else might I try?

Nick

[Lee]

Nick,

Hi, did you have the flywheel re-surfaced when you performed the clutch job?

Allot of time a heat streaked flywheel can cause the grabbing you describe.

Lee

[FORDification]

Here are some possibilities:

Clutch chatters when engaging

1. Damper springs in the clutch disc hub or the marcel spring between the facings is fatigued.
Solution: Replace the clutch disc

2. Friction surface on the flywheel or pressure plage is glazed from the heat.
Solution: Resurface or replace as necessary

3. Clutch disc is running out on the input gear (hub problem)
Solution: Replace the clutch disc

4. The flywheel or pressure plate surface is running out.
Solution: Reface or replace as required

5. Oil on friction surfaces.
Solution: Repair the oil leak (typically the engine rear main or oil pan if not the transmission from seal) and replace the disc. Avoid parts contamination upon reassembly

6. Linkage works erratically.
Solution: Inspect the linkage, paying special attention to the holes in each lobe. Repair or change the linkage as required

7. Play in the motor mounts allowing for shifting of the powertrain, relative to the linkage.
Solution: Change or repair the motor mounts

[FoMoCo]

Great ideas. The flywheel was resurfaced and new ring installed. The motor mounts had come lose and were tightend this past weekend. There was an oil leak thanks to a defective valve cover gasket. And the pedal linkage is just crap, soon to be replaced with a 68 version. I made sure to clean the surfaces with body shop prep before closing everything up. I'll play with the links. If there is oil residue on the disk could I remove the fork boot and soak every thing with cleaner? Thanks

Nick

[Pro-Street/StateTk]

All very good suggestions, I would also suggest that you check your (Trans) mount to see if it has play or worn out.

I bought a 74 ford truck years ago I was told that it had all new clutch and
pressure plate, but within the first week of driving it,it would jump and hop
very bad, well this truck was 2wd and had ground hog 44s on the rear I did not need or like them on a 2wd so I found a buyer for them and I put
a stock tire back on it, to my surprise it started to drive just like it had a
brand new clutch! So what I'm getting at is what size tires are you running.



P.S did you check your pilot bearing to make sure it was not worn or even
still in the back of the crank I have saw some trucks that people change
the engine from an auto to standard, and never think to install one?