M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine + Driveline => Topic started by: jimc2 on May 30, 2010, 05:00:23 PM

Title: M42 Lower exhaust manifold flange- studs or what?
Post by: 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
Title: manifold threaded?
Post by: jimc2 on May 30, 2010, 08:04:38 PM
clarification:
post refers to item #2, does it thread or press into the manifold flange?
Thanks

(http://www.realoem.com/bmw/diagrams/b/w/3.png)
Title: M42 Lower exhaust manifold flange- studs or what?
Post by: colin86325 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.
Title: M42 Lower exhaust manifold flange- studs or what?
Post by: BlueBMW 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.
Title: M42 Lower exhaust manifold flange- studs or what?
Post by: DesertEagle 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.
Title: M42 Lower exhaust manifold flange- studs or what?
Post by: Slick92GS-R 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 !!!