Are exhaust studs press fit or threaded? [Archive] - Bimmerforums

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diablodude64

11-01-2011, 05:15 PM

I thought the exhaust threads were press fit in the manifolds but then I heard that the studs in earlier e36 were threaded in. Mine is a 1993 325is. What should mine be?

Thanks, Kyle

Spyke

11-01-2011, 06:00 PM

I've had 92 & 94, both US and German build. Everything I've seen has been threaded no matter what.

JDStrickland

11-01-2011, 06:01 PM

I always found these studs to be threaded in.

You can find them on penskeparts.com or realoem.com.

drummerboi

11-01-2011, 06:06 PM

I believe obd1 headers are threaded in.... opposed to obd2 headers, which are pressed in...

flyfishvt

11-01-2011, 06:47 PM

My 92 318 and 95 325 had threaded studs. I don't believe OBDII engines have pressed studs.

coolpizzadude

11-01-2011, 07:10 PM

I beleve they are threaded.

95M3032679

11-01-2011, 07:54 PM

Threaded
Just did an OBD II exhaust gasket yesterday.

epmedia

11-01-2011, 08:06 PM

'94 325i are all threaded from the head to the down pipe, I don't know about the rest.

choffa

11-01-2011, 08:57 PM

A quick search of RealOem or other part database is all that's needed to eliminate the misinformation and conjecture.

M50 engines OBD1 use a double threaded stud threaded into the manifold. The manifold does not have threads, the unthreaded shoulder is a press fit into the manifold flange:
Stud bolt M10X35 11621708999

M52 engines OBD2 use a shoulder bolt pressed into the manifold:

Hex bolt M10X40 11621427586