Pilot / Throw Out Bearing Cost
01-27-2010, 02:23 PM
#16
Three Wheelin'
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Pilot bearing vs clutch throwout bearing is a big difference.
What is your plan? If you want to take it from fl to ny, buy the parts and you can stop at my place in VA for a break and we can do the clutch. We'll have a gtg and it won't take more than an afternoon/evening. I've done it on my car and have the tools necessary. You can even crash in the spare bedroom if you don't creep out my wife.
I'm sure it would last that long on the freeway anyway.
If it's a pilot bearing, I haven't done one before and can't make any promises, though I do have a press to push the pilot out and install the new one. That said it doesn't sound too much worse than a clutch job Given it isn't welded to the crank. I suppose we wouldn't know until we pulled it all apart, aye?
What is your plan? If you want to take it from fl to ny, buy the parts and you can stop at my place in VA for a break and we can do the clutch. We'll have a gtg and it won't take more than an afternoon/evening. I've done it on my car and have the tools necessary. You can even crash in the spare bedroom if you don't creep out my wife.
I'm sure it would last that long on the freeway anyway.
If it's a pilot bearing, I haven't done one before and can't make any promises, though I do have a press to push the pilot out and install the new one. That said it doesn't sound too much worse than a clutch job Given it isn't welded to the crank. I suppose we wouldn't know until we pulled it all apart, aye?
Dave
01-27-2010, 02:25 PM
#17
Three Wheelin'
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Wow thanks for the memories, I think. I can intimately remember each and every step including fabbing my own puller to get the pilot bearing out - the grease/dowel method didn't work for me. If you're digging in this far, go ahead and replace both bearings, install new clutch discs, and give everything else a thorough checkup. With an '87 first choice would be to backdate to the much better dual clutch setup 
but GTS items are a good second choice.
but GTS items are a good second choice.Dave
01-27-2010, 03:15 PM
#19
Race Car
- DD pressure plate
- DD clutch discs (the two are different, the front one has a 20mm hub and the rear one has a 25/29mm hub)
- DD release bearing
- Six M8x40mm grade 12.9 allen bolts with lock-washers
- DD clutch arm
- DD guide tube
- DD intermediate plate
- Grind 15mm off the clutch slave cylinder rod
- DD flywheel that has the timing ring from an S4 automatic flywheel pressed on to it in the correct orientation
The first three come in a standard DD clutch kit. The others have to be sourced separately. I wish this list was already somewhere on rennlist before I started this
Dan
'91 928GT S/C
475hp/460lb.ft
Last edited by dprantl; 01-27-2010 at 03:35 PM.
01-27-2010, 04:08 PM
#20
Three Wheelin'
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Timely question, this is what I'm doing right now. You will need:
- DD pressure plate
- DD clutch discs (the two are different, the front one has a 20mm hub and the rear one has a 25/29mm hub)
- DD release bearing
- Six M8x40mm grade 12.9 allen bolts with lock-washers
- DD clutch arm
- DD guide tube
- DD intermediate plate
- Grind 15mm off the clutch slave cylinder rod
- DD flywheel that has the timing ring from an S4 automatic flywheel pressed on to it in the correct orientation
The first three come in a standard DD clutch kit. The others have to be sourced separately. I wish this list was already somewhere on rennlist before I started this
Dan
'91 928GT S/C 475hp/460lb.ft
- DD pressure plate
- DD clutch discs (the two are different, the front one has a 20mm hub and the rear one has a 25/29mm hub)
- DD release bearing
- Six M8x40mm grade 12.9 allen bolts with lock-washers
- DD clutch arm
- DD guide tube
- DD intermediate plate
- Grind 15mm off the clutch slave cylinder rod
- DD flywheel that has the timing ring from an S4 automatic flywheel pressed on to it in the correct orientation
The first three come in a standard DD clutch kit. The others have to be sourced separately. I wish this list was already somewhere on rennlist before I started this
Dan
'91 928GT S/C
475hp/460lb.ftDave
01-27-2010, 04:13 PM
#21
Race Car
Dan
'91 928GT S/C
475hp/460lb.ft
01-27-2010, 06:20 PM
#22
Rennlist Member
Actually, its the 85 flywheel, and the timing gear/ring from an S4 automatic. 928Intl. pressed it on for me in the proper position and gave it a few spot welds as well. other than a possible lower bell housing rub, in areas of the timing ring, you should be ok. (thats just a dremel mod , if there is an issue there. There was with mine, because I used the OB lower bell housing and slave, which has a threaded bolt area in the casting, on the inside, that is oriented differently and it had to be filed down to clear the timing ring)
mk
mk
I don't have any photos, but there really isn't anything special that you have to do, it's just a standard clutch job. If you search for clutch replacement you will get lots of info and pictures of the process. Sharkskin also has a page dedicated to clutch replacement on an old car: http://members.rennlist.com/sharkski...R30-Clutch.htm. The workshop manual also has ok instructions and pictures. Cutting the rod is easy, just mark 15mm from the end and chop it off, then grind around to make the end rounded. The flywheel I already got assembled from another lister, but all you need to do is get an '85-'86 US flywheel, press the old timing ring off it and press the new one on.
Dan
'91 928GT S/C 475hp/460lb.ft
Dan
'91 928GT S/C
475hp/460lb.ft
01-27-2010, 07:22 PM
#23
Race Car
I thought US '85 and '86 5-speed flywheels were the same? Both years used engine M28.43 and flywheel part number 928 102 078 01. In fact, now that I'm looking at it, it's the same as the '84-'86 EuroS 5-speeds as well (engine M28.21). You do not need to change to the earlier bellhousing. Mine fits just fine with the later starter bracket and no modifications except for the slave cylinder rod.
Dan
'91 928GT S/C 475hp/460lb.ft
Dan
'91 928GT S/C
475hp/460lb.ft
01-27-2010, 08:15 PM
#24
Burning Brakes
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One piece of advice I have for you is to get some dry ice. When I pulled mine, I crushed it into a fine powder (use a ziploc bag) and packed it in there. Repeat several times. The cold seemed to loosen up the bearing and with a mighty tug, she came right out. I tried before the dry ice and it was a real SOB. Also, I made my own puller, which was very easy to do and I found to be quite rewarding 
01-27-2010, 08:43 PM
#25
Rennlist Member
Yes, the lower bell housing change was a choice to get rid of the starter bracket . yes, the 85 86 flywheels I think are the the same as well. the only point was to use the automatic S4 timing ring, that would press on the slightly earlier flywheel to make all the stuff work.
mk
mk
I thought US '85 and '86 5-speed flywheels were the same? Both years used engine M28.43 and flywheel part number 928 102 078 01. In fact, now that I'm looking at it, it's the same as the '84-'86 EuroS 5-speeds as well (engine M28.21). You do not need to change to the earlier bellhousing. Mine fits just fine with the later starter bracket and no modifications except for the slave cylinder rod.
Dan
'91 928GT S/C 475hp/460lb.ft
Dan
'91 928GT S/C
475hp/460lb.ft