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Old 04-24-2013, 06:31 PM   #16
Doughnut
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I tightened my head down THE WRONG WAY AROUND!

Intake manifold is now on the exhaust manifold side... Will my m30 run okay like this?

Cheers.
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Old 04-24-2013, 07:07 PM   #17
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Quote:
Originally Posted by Doughnut View Post
I tightened my head down THE WRONG WAY AROUND!

Intake manifold is now on the exhaust manifold side... Will my m30 run okay like this?

Cheers.

Seeing as you're in Aussie land, yes.
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Old 01-29-2014, 04:30 PM   #18
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i'm building up an m30b35 and looking at the manual the torque specifications are slightly different than what you followed OP. is everything still ok on your block/gasket?

any others using this thread's torque procedure able to chime in?

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Old 01-29-2014, 04:37 PM   #19
yert315
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The torque specs I listed are for the s38 engine. I'm unsure why the manual calls for a torque to yield spec as the Head bolts are NOT stretch bolts on the m30.

I've done countless m30 head gaskets using these specs. Not one has failed yet.
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Old 01-29-2014, 04:59 PM   #20
glnr13
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thanks! if it's good enough for an m engine it's good enough for my b35.
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Old 02-25-2014, 04:31 PM   #21
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I just want to Add a few things.... DEFINITELY take your head to a reputable machine shop and have it checked while it's off.... It will most likely need a valve job, some valve stem seals, and maybe even a surface... Keep in mind this is obviously extra money, but well worth it.

Great write up though! Really awesome resource for people.
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Old 03-05-2014, 07:18 PM   #22
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Great write up

This is definitely one of the best write ups I've seen on the M30b35 head. I'm actually about to put a completely different M35 head on mine and was wanting advice on how to make sure the head timing is set correctly before I bolt it on.
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Old 06-21-2014, 12:59 PM   #23
Psygo
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wait what?
it's not stretch bolts on m30s?
so where am i being misinformed, my bmw dealer and the local au2parts store or here?
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Old 06-21-2014, 03:19 PM   #24
Bearmw
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Is that a serious question?
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Old 06-22-2014, 12:47 AM   #25
Psygo
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not really, i'm assuming my bmw dealer and local au2parts knows their shit.
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Old 06-22-2014, 10:06 AM   #26
Bearmw
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After reading a lot on the subject the most consistent info I could find is that M30 headbolts are not torque to yield and can be reused if they pass a good visual inspection whereas M20 and M50 bolts are not to be reused. M30 headblots are hex head wheras m20 are Torx. I suppose if you are building an all out M30 it can't hurt to use new bolts or even studs but for the majority of the headgasket jobs they can be reused without issue. Make sure to chase and clean out the holes in the block, make sure the head is straight , make sure the bolt threads show no deformation, galling, etc. and you should be good to go.
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