308 Clutch Adjustment? Help me please.

Hi
All GT4's and the early GTS/GTB's had the over-center helper style mechanism. But there is a Tech Bulletin that describes conversion to constant contact operation (referring to the throwout bearing). It can be difficult to tell which setup you have since in some cases people have done a partial conversion. It matters when making the adjustments.
The Tech Bulletins can be viewed at http://dino308gt4.com as can the service manual for carbed 308's (Same manual for GT4, early GTS and early GTB, this should help to dispel those vicious rumours that GT4's are not real Ferrari's. )
For QuasiMotor sepcifically, there is a QV service manual on Steve Jenkins site, http://ferrari.jenkins.org

Gerrit

 

Don, good to see you back, how's the car?

On the GT4, you :

1. Disconnect the cable at the tranny
2. Line up the 2 6mm holes on the clutch actuating arms and the tranny, then put a screw driver through the holes to keep them there.
3. Adjust the cable adjuster link so that the cable can be connected just right.

Remove the screw driver, you are done.

 

Mitchell, car should be in my hands sometime within the next few days!

Which two 6mm holes are you referring to in reference to the diagram I am posting here?

From the diagram, it appears that there is a 6mm alignment hole near fulcrum 3 on the lever 1 and another 6 mm alignment hole on the bell housing itself probably near the fulcrum 3 as shown. I am suspecting that this alignment is an eyeball alignment or do I insert a pencil or something straight to insure that the two holes are perfectly aligned and not cocked?

Thanks in advance.

 

Them's the ones. Stick a mid-size screw driver through them and then adjust.

 

A clevis is a fork shaped linkage connector, the clevis pin connects the cable fork to the arm....with a split pin through the hole to stop it falling back out again....many cars end up with bolts in their place...this is wrong

you funny americans may call it a cotter pin, or you may call the split pin the cotter pin, I'm a mechanic, not a linguist!!

and yelcab....

strictly speaking you are slightly incorrect

to set up the remote helper type you FIRST set free play to be about 10-15mm at the pedal using the 11 and 8 mm main clutch adjuster, THEN you CHECK that a 6mm drill bit slides through the alignment holes, and THEN if it doesn't you adjust the cable length 10mm spanner part to get it right...if you were to put a drill/pin in the holes FIRST is it quite possible to have no idea what the free play is.

Chances are, like a QV, if you're just taking up a bit of wear, and the cable was correctly set when installed, then the cable will not need adjusting...ever.

And using a screwdriver that is say 5mm, not 6mm makes a surprising amount of inaccuracy to the helper device.

 

Stricly speaking, F-Fixer, we are both slightly incorrect. The WSM says (refer to the pix above posted by Don) to disconnect item 4, line up the two holes, and adjust the linkage number 4 so that it just fits over the arm.

Done this way, the pressure plate has zero loading at rest, thereby saving your thrust bearing. And the pedal freeplay is given by the 5-6mm flex in the spring-arm.

There, you go Don.

 

BTW, a Craftsman #2 phillips screwdriver seems to be just the right size for these holes. It's a snug fit which is what you want.

The best writeup including drawings for setting up the old style clutch linkage is in the 308GT4 workshop manual. A PDF is available at:

http://ferrari.jenkins.org/books/

 

NO.

The release point and grab points should be fairly close to the top of
the pedal's travel.

It's supposed to be that way.
The 308s with the new style (late '70s forward) clutch linkage are designed so that the throwout bearing is ALWAYS slightly touching the pressure plate. Thus the pedal spring is always pulling down enough so that the linkage has no slack in it, and the throwout bearing is slightly riding against the pressure plate. Thus as soon as the pedal starts to move, the pressure plate starts to reducee pressure on the driven disc.

The purpose of the clutch adjustment is to keep the pressure from the pedal spring low enough so that the spring isn't starting to release the clutch.

 

bump, so i can find this.