blown 87

I should be ready to install my dual disk clutch and do the 5 speed conversion soon and have a few questions.

Lets start with the clutch parts that came out of a 80.

Will a GTS clutch arm, tube, release bearing, ball and other goodies work with the 80 parts?

I had my engine balanced when I built it, should there be any problems when changing the flywheel? (I know, I know)
Is there any place that any one can recommend the can balance the flywheels to the same specs?

How much lip is ok on the intermediate plate?
Mine has a lip on it, not sure if it can or should be ground or who could do it, suggestions?
How about getting new friction surfaces?
There is still some meat left on them.

I also need the brackets that hold the line from the Master cylinder to the Slave if any one has a set for sale.

I think I have everything else coming except for the cylinders, I do have the short push rod, 5 speed condenser, 5 speed pod, trans crossmember from a 88 5 speed, superbearings, etc.

I am sure there will be more, but I AM going to make time to do this THIS year.

Lizard928

Take the flywheel and clutch assembly to the shop that balanced your motor and they should still have the information regarding it.

No idea about the GTS arm, guide tube etc.

GlenL

The 928 engine is internally balanced so the flywheel is balanced separately.

Zero lip on the flywheel. Get it surfaced.

Check the P/Ns of what you've got versus what goes into an '80 to see if that stuff will work.

Lizard928

Actually Glen the early flywheels used that lip to hold the intermediate plate. The later ones without a lip uses 3 dowel pins.

I think I may have an 80 euro release arm....

GlenL

Sure. I know that. Those "early" flywheels are pre-80. Mine doesn't have the centering lip.

So ya got the three dowels, or holes for them, or does the pressure plate fit inside the lip? Hopefully you don't have the lip style as it's hard to machine a new surface and the replacement kits are more expensive.

blown 87

I took the flywheel and intermediate plate to the machine shop, I have not heard back from them, but from looking at the flywheel off of the 80 it appears to be externally balanced, due to the drilled holes in one part.

The flywheel I have does not have any lip on it, the intermediate plate has a wear lip on it.
It is not like the flywheel that has the lip from the factory, this one is smooth.

I know the answer to the lip on the intermediate plate, just wishfull thinking I guess, it is worn.

Rob Edwards

Greg-

I don't think you can use a GTS throwout bearing or guide tube with the DD pressure plate, though the intermediate shafts are all the same.

I'm not sure about using the '09' GTS release arm, but I have an early TOB and a GTS release arm at home, will test fit the 2 together.

Can't recall seeing a spec on the intermediate plates, and I'm not sure how you'd surface it, since it's recessed below the surrounding support plate. Page 30-24 discusses 'deflection' limits on the plate, but I don't understand WTH they're talking about.

This gets a little messy with a late clutch master, an early slave cylinder, and an S4 starter. I think you need the S4 hardline from slave to the swaybar bracket, then the slave hose from the swaybar bracket to the slave cylinder (928.423.077.07 is solid gold ($$$), AND if you're going to use the early slave cylinder, I'm not sure whether the S4 hardline will line up. For comparable money Greg's got one that removes the need for the bracket on the oil pan and goes all the way from the swaybar to the early slave.

Do you have a 78-82 lower bellhousing cover?

ROG100

You do not need the later clutch parts on the earlier dual disk setup.
If it was an 87 up single disc clutch then yes you would.
Hope that helps.

blown 87

So I can just use the inside parts of a new release bearing and be done with it, at least for the arm part?

I have the complete clutch out of the 80, but it has some wear on it and i would rather just do this once.

You know me Roger, I replace stuff that most call great, but I know it is new when I put it in, and if it last a week it is gonna go the distance in most cases.

Any options on the intermediate plate?

blown 87

I have got the late model clutch master and slave cylinder and early DD clutch worked out, all you need it the short push rod from a early car.

Yes, I have the early lower cover.

I will look at the WSM on the wear limits, but it needs to be done i am willing to bet.

jcorenman

Correct on the short push rod (grinder works also), you may also need to modify the master (shorten the internal stop pin) for a bit more travel.

My understanding is that the release bearing and guide-tube are different for the 86-prior DD-clutch, with a smaller ID on the release-bearing and smaller-OD on the guide guide tube. At least that's what I used, with the later arms, and it all worked.

I've got an extra clutch-hose bracket (the one that attaches to the oil-pan bolts) if you an use it, and an extra hose and hard-line from frame-bracket to slave. I replaced those parts with a trick hose from Greg B. that routes around the front (bow-end) of the starter instead of threading between starter and OP. Makes life simpler-- upper starter bolt is accessible and the slave can be removed without loosening anything else.

SharkSkin

Greg, my clutch assembly including flywheel was off by about 10 grams when I had it balanced. The starter ring was the worst, off by 10 grams. More info on my clutch page. I did a lot of other work at the same time, including TT and trans rebuild but the car revved MUCH smoother after all the work.