m40 exhaust manifold leak?

[Ziggy]

I haven't investigated yet, but my brother's 316i sounds suspiciously like a diesel so I'm guessing there's a leak somewhere round the exhaust manifold... (it still goes very well for a 1.6, so I reckon the cam etc is fine) Is this a common prob on m40s? & are the gaskets difficult to change? Snapped studs likely?

Never had reason to work on one, so I'm just looking for pointers from someone who has really!

Cheers

[Jos]

The exhaust manifold off my M30 was welded in 2 places and cracked in a 3rd place, the cast iron used is very brittle and will crack if hit, they can smash if dropped too. Have a look round the entire manifold for black markings where gas could be escaping.

Exhaust studs are a bugger to get off, always very rusty and very hard to get to, investigate other stuff 1st like the downpipe flange and the manifold body 1st

[Ziggy]

Cheers Jos

Was just wondering if there was anywhere particularly likely to go on the m40 really...?

[Ziggy]

bump

[FlashBastd]

I had to get the gasket replaced on mine as it had torn, and was blowing. Think the most awkward job is removing the nuts without snapping the studs.