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Reuse or replace clutch


Mike G

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I’m putting together a list of parts I need but I’m unsure of a few things. Getrag 245/tii engine. My clutch visibly looks fine, has worn about 1mm compared to a measurement from a new clutch I found here. It has 1.5mm remaining before the rivets. Is it worth replacing now while I’m in there? How many miles can I expect from the current clutch if I reuse it? 

 

My clutch fork has some wear, should I smooth the rough spots and run it or replace? IE has a replacement for $20 which seems like a no brainer but my parts list is already into the thousands so I’d like to save a couple bucks where I can. 

 

I plan on doing seals and pilot bearing, anything else I should do while it’s apart? It shifted ok, second is notchy and I have to hold the clutch a few seconds for reverse which apparently is normal for the 245. The master, slave, and hose are new last spring. 

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My rebuild regret was not using a new fork and new slave push rod. Result is a pop sound as I release the clutch and it jumps a bit as the friction catches

 

Other posts indicate a wear pattern in fork hole and rod end cause this. Easy to understand after 100k+ miles of mechanical friction

 

Randy

1975 - 2366762 Born 7/75

See the whole restoration at:

http://www.rwwbmw2002.shutterfly.com

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1 hour ago, Mike G said:

Is it worth replacing now while I’m in there? How many miles can I expect from the current clutch if I reuse it?

 

How many miles are on this unit? How many miles do you drive in a year? Could you get 10-20-30-thousand miles? Sure, depending on how well your shifting skills are. FWIW my Tii has over 200K on the clutch, mostly highway though, and I always "double clutch" and rev match on downshifting, its second nature..All bets are off if you live and drive in San Francisco.

 

You could choose to just replace the disc if there are no offending grooves in either the flywheel or PP.

 

If you do choose to replace the PP, I would advise against purchasing a "heavy duty" or "sport" clutch. With the stock Tii Hp, the "regular" is fine to handle that. The problem is that the HD PP, aside from giving your leg a workout in traffic (BTDT) it tends to make the center thrust bearing in the block to wear unnecessarily, allowing the crank to move forward and aft out of specification. A compromise is the PP from the E30 M3, good for up to at least 235 Hp.

 

The overarching decision is what is your time worth if you have to do this again in a short period of time rather than just drive?

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Then sure, why not "while you are in there".

 

But, depending on the person and the usage it might be best to keep that in your parts hoard, because there may come a time when they are NLA, like Turbo PPs and you have to spend dozens and dozens of hours researching to find a suitable replacement.

 

Me personally? I'd reuse it because now I only drive maybe a few thousand miles a year at most, so it may last 10 years. I used to drive 15-30K miles per year; weekends roaring around in the mountains for 350 miles. But back then, I maintained 4 cars, and couldn't afford the time to jack up the car, pull the exhaust and driveline, transmission et al., then back together during the week. Having to do that service twice in a short time would make having the car more of a chore and no longer fun.

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It's not the miles, it's the slippage.  If you're not using the clutch to drag the thing up to 

speed, it will last just about forever.  It's pretty robust for what it is.

 

But if you need to launch at 4k rpms, shift flat all the time, blah de blah, it will last a lot less.

 

Looking at the friction surface, you will get a lot of moderate to easy use out of it.  But show

us a picture of the flywheel and pressure plate surface, and the fingers of the spring diaphragm,

and that'll tell more.  

I would reuse that on a 'few year' car, but I don't mind dropping transmissions on these cars...

 

t

 

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Based on the (lack of) wear on the flywheel, I'd run that clutch.  That still looks good,

no major signs of abuse.  If the other side of the pressure plate doesn't show major wear

where the throwout bearing hits the fingers, I'd run the plate, too.

 

Waste not, want not!

 

t

 

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"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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