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      03-15-2014, 10:46 AM   #1
yousefnjr
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Replace output shaft seal - bolt questions

I was changing my oil a few weeks ago and noticed my passenger side output shaft seal is leaking a bit and it's a little moist around the output flange. I ordered a new seal, and in my quest to find a torque spec for the output shaft bolts (6x E12), I read that the bolts cannot be reused .

Realoem says the bolt I need is 33211227664, however I recall finding a different PN (26111229536) from an E46 thread. Anybody know which is correct? Looks like one is M10x45, and the other is M10x23.

Regarding tightening torque, I'm finding lots of different specs. 100 nm from TIS, which I tend to trust. Also seen 64 nm? 59 ft-lbs?

Anybody have any input on this? Thanks
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      03-15-2014, 02:10 PM   #2
GuidoK
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Torque spec is 100Nm.
64Nm is a spec from an e46 with small engine (316 or so; m8 bolts).

Tis says not to reuse bolts+platelets, but I've reused mine maybe 4 times.
With a lot of things I find not reusing bolts a bit exaggerated. (like the bolts from the front aluminium support frame etc).
But that's my personal opinion.

However I always use the (tis) torque specs. With used bolts mostly with a (ceramic) antiseize (lightly).
For some support frames (for example the (hollow) rear aluminium support bars) I use 10% less torque with the anti seize.
Anti seize (and oil) have a slight effect that the torque friction is lower (about 10%), so it is easy to crush things.
I use the anti seize because most bolts are (passified) zinc plated. Using them a second time means that the threads can be partially zincless as tightening them the first time will cause fretting on the zinc.

Be sure not to damage the E head (inverse torx) on het bolts. You don't want to strip those...
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Last edited by GuidoK; 03-15-2014 at 02:18 PM..
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      03-16-2014, 10:36 AM   #3
yousefnjr
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Thanks there aren't many posts around for this repair on a z4m, so I think a lot of the e46 threads I read were confusing me. I ended up ordering the m10x45 bolts anyway, but it's good to know that if they're the wrong size I can still use the originals.
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