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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Jul-09-2018, 04:32:54 AM   #1
haus
So anal, my torque wrench has a torque wrench up its ****
 
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Default Clutch master cylinder bolt snapped

I'm replacing my clutch hydraulics, and while tightening the bolts on the master cylinder the lower bolt snapped. (I was reusing the old bolts, going for 17 ft lbs per Bentley.)

I'll order new hardware, but I wondered if there's anything I should be looking at in terms of lining up the CMC that might have caused the bolt to snap. Everything looks lined up to me.
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Old Mon, Jul-09-2018, 04:46:29 AM   #2
Braymond141
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Default Re: Clutch master cylinder bolt snapped

They are M6 bolts. Max torque is 10 ft lbs for a 10.9 bolt. The Bentley is wrong and this isn't the place that is necessary to be fitting a torque wrench in. Just tighten till it is snug.

I can't find the E36 bolt torque pdf, but the E46 pdf lists them as 9nm or 6.6 ft lbs.
http://sawashie.free.fr/M3/TorqueSpe...SPECS%20LR.pdf
Page 70

Last edited by Braymond141; Mon, Jul-09-2018 at 04:53:24 AM.
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Old Mon, Jul-09-2018, 01:21:30 PM   #3
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Default Re: Clutch master cylinder bolt snapped

Well that certainly explains it. Thank you Brett. I hope the MC is okay. I'm pretty sore from doing that job, wouldn't mind not doing it again for awhile.
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Old Tue, Jul-10-2018, 12:40:51 AM   #4
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Default Re: Clutch master cylinder bolt snapped

It surely sucks when one snaps a bolt...I just did the clutch master cylinder...found it much easier doing it upside down however, my problem is a stuck bleed nipple in the passenger rear caliper...so I can't even start the car as the brake fluid reservoir is completely empty (the rubber cover for the hard brake line when changing to SS worked itself off overnight letting out all).
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Old Wed, Jul-11-2018, 04:46:38 PM   #5
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Default Re: Clutch master cylinder bolt snapped

My front DS bleed screw gave me some trouble last time I bled, but I got it free eventually.

In case this helps someone, on the older style clutch master, people talk about having to pull the hard line through the firewall into the footwell to connect the new master. It's much easier to do that if you disconnect the other end of that hard line from the bracket under the car (where it meets the hose). Then you can easily pull the hard line into the footwell without putting any pressure on it or having to lock it in place with vise grips.
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Discussing Clutch master cylinder bolt snapped in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)