QUOTE(Brad Roberts @ Jul 29 2003, 01:39 PM)
MarkH..
Lets chat about this endplay game.
Are you saying that it could be different per flywheel ??
I dont do a whole bunch of clutch jobs (unless its a 9146).. and I have normally just turn the customers flywheel..so not much issue there.
Talk to me.. talk to the BBS. Are they playing with fire here ??
B
Yep, you/they are!
Factory endplay spec is.003 to .005 for the /4 engine. No two flywheels are exactly the same and if you get an asshole like me, I true (regrind) the shim surface all the time. The tool to check this dimension is cheap and can be bought at any bug shop.
If you have a bunch of old shims in a drawer go measure them, you’ll find from .007 to .015 in .001 increments. There is a reason for this, in the manufacturing process from flywheel #1 (or/plus the crank, case, bearing etc.) to flywheel # 1000, the tooling wears therefore changing dimensions.
Never assume, measure it!
If you run too much endplay, your crank can actually hit the bearing saddles as it spins, resulting in certain early death. I can’t remember if the /6 engine endplay is set the same (I think it is, but ’97 was my last 911 full rebuild) but if it is it should be checked.
Every /4 engine will have 3 shims, anymore (never less) and you have big f’in problems.
If it’s the same fly that was on the engine to start with, your OK as long as the other guy did his job right. I don’t chance it, I always check. You would not believe the shit I’ve seen.
Does anyone have the PP tech link (sorry, I’m really too busy to look) I’d like to see what they say about this.