Author Topic: M42 Lower exhaust manifold flange- studs or what? (Read 3662 times)

jimc2 · « **on:** May 30, 2010, 05:00:23 PM »

Anybody know if the M42 lower exhaust manifold studs are threaded into the manifold flange or a headed press fit bolt? I see different pictures on parts suppliers and oem type diagrams.
Nice to know before I light up the torch and get the BFH out..
Thanks
Jim

jimc2 · « **Reply #1 on:** May 30, 2010, 08:04:38 PM »

clarification:
post refers to item #2, does it thread or press into the manifold flange?
Thanks

colin86325 · « **Reply #2 on:** May 31, 2010, 05:35:50 PM »

I'm pretty sure they are of the press-fit type. They are easily replaced with high-quality metric bolts.

BlueBMW · « **Reply #3 on:** May 31, 2010, 07:33:55 PM »

Last ones I saw were on a 95 318ti with an M42. The oem studs were strange. They were not press fit but rather had a round head with a side cut off at an angle. They looked like they were intended to be welded on. I just used some nuts and bolts instead.

DesertEagle · « **Reply #4 on:** June 07, 2010, 07:01:41 PM »

On my 1991 318is, those "bolts" were tack welded onto the flange. I used a dremel with the gyros cut-off wheels (i think 1.5"). The gyros wheels work so much better than the standard stuff. I then replaced them with grade 8 bolts with lock washers.

Slick92GS-R · « **Reply #5 on:** June 16, 2010, 08:29:09 PM »

Quote from: deserteagle;93344

on my 1991 318is, those "bolts" were tack welded onto the flange. I used a dremel with the gyros cut-off wheels (i think 1.5"). The gyros wheels work so much better than the standard stuff. I then replaced them with grade 8 bolts with lock washers.

^^^ this !!!