Rattly M30 Engine

[gareth]

the only thing i havent tried yet is brians suggestion of turning off the ignition while moving in gear to see if it is the injectors....ill get round to it if i remember one day

just remember the steering lock!!!!!

[Demlotcrew]

the only thing i havent tried yet is brians suggestion of turning off the ignition while moving in gear to see if it is the injectors....ill get round to it if i remember one day

You dont need to do that, just lift off the accelerator the ECU will cut fuel to the engine. (over run)

Andrew

[DRIFTBOY]

I used the new style hollow spray bar bolts and checked them a few times since.
I used a brand new Schrick camshaft - not to say it isn't damaged by now somehow though, but the lobes all look like new.

I tried another set of injectors, no difference!

Thanks for all suggestions though, any more ideas most welcome!

[Andy335Touring]

"M30 engines can suffer from oil starvation on the camshaft resulting in damage. This is preventable with a new design of hollow bolt for the oil feed bar."

Taken of the unix nerds BMW site?

These bolts often losen themselves which causes problems!

Yep, thats why i got these, the lock wire isn't on right in this pic but it's sorted now, unfortunately i didn't back up my favourites so i lost the link the last time i formated my HD

Easy to replicate with a decent drill though

[Andy335Touring]

The other thing whilst i remember is i read a post on another forum about a chap who thought he was missing his little "ball" in his chain tensioner, i don't remember seeing one on mine but it might sit in the metal slider(#27) type thing normally ?

But it is so small that if you didn't know it was there it could fall out when you take the spring out and not notice ?

Here's the ETK picy, unless you zoom the picture you might not see it, oh and it's not going to break the bank if you need to get one as the ETK is showing it costs 13p !

Part # 07 11 9 986 250

[DRIFTBOY]

Ooh, that's intersting!

I've had my chain tensioner out and apart a few times and never seen that part!

Nice one Andy!

[nickso]

lol gareth....that nightmare did cross my mind.

andrew...ill try that instead....is much easier

[Andyboy]

Another thing to try is to set the valve clearances wider than normal. Some have found that using the feeler gauge between the cam lobe and rocker makes the enfine quieter than the normal way. Run through them this way and you may find one that's a lot wider between the cam and rocker than the others even though the rocker to valve clearances are fine.
It could be light valve to piston contact as the piston expands with heat. The way around this is either a thick head gasket or fot the time being open up the valve clerances by 5 thou.

[DRIFTBOY]

Yeah, Schrick recommend 0.25mm clearance against 0.35mm of the standard camshaft, worth a try I reckon!

I didn't realise a thicker head gasket was available until I'd already got my engine going! Might be the proper answer though I feel.

Cheers guys!

[Andy335Touring]

I didn't realise a thicker head gasket was available until I'd already got my engine going! Might be the proper answer though I feel.

Cheers guys!

It's +0.3mm for the thicker gasket, about £80 for a genuin BMW gasket, thats just the gasket not a head gasket set or £45 from ECP.

But check the prices first because they might have changed since.

[DRIFTBOY]

It's +0.3mm for the thicker gasket, about £80 for a genuin BMW gasket, thats just the gasket not a head gasket set or £45 from ECP.

But check the prices first because they might have changed since.

Thanks Andy, I think I'll start planning my head removal soon. And I think I'll go genuine for peice of mind!

I can't bear listening to the typewriter under my bonnet much longer!

[Andy335Touring]

at least it's a fairly straight forward kind of job plus it's not long been apart so it should come apart with out to many siezed nuts/bolts/etc.

When you remove/lower the down pipes you can get to the block drain plug to drop the coolant, droping the coolant will save you a bit of time.

Buy plenty of tins of carb cleaner and a tub of cotton buds.

Shame your not closer or i'd give you a hand.

[DRIFTBOY]

Thanks for the kind thoughts!

I already have cotton buds, carb cleaner and everything else I can think of in my garage 'stock' !

I'm not worried about doing the actual work, just worried that I'll find something that needs parts ordering or machine work doing and that my only car that I own will be out of action, and that I won't be able to get to work!
If it just needs a head gasket change and nothing else though, should be done in a day no problem.

[Andy335Touring]

just worried that I'll find something that needs parts ordering or machine work doing and that my only car that I own will be out of action, and that I won't be able to get to work!

yeah, i know what you mean

[gareth]

i have read somewhere that the ECP gaskets are useless... i can't vouch for this personally as i've only ever used GSF ones but having a head gasket fail just after you've fitted it is a real pain in the arse! i had this once on my RS2000... that may have been something to do with the +1.5mm bore and 14:1 compression that i wasn't aware of at the time!!!

[Andy335Touring]

I hope not, mines from ECP

[gareth]

[nickso]

Another thing to try is to set the valve clearances wider than normal. Some have found that using the feeler gauge between the cam lobe and rocker makes the enfine quieter than the normal way. Run through them this way and you may find one that's a lot wider between the cam and rocker than the others even though the rocker to valve clearances are fine.
It could be light valve to piston contact as the piston expands with heat. The way around this is either a thick head gasket or fot the time being open up the valve clerances by 5 thou.

ive tried it wider and tighter..made no difference.

i always do it between rocker and cam because i reckon the eccentric makes a small dent in the valve meaning you are not setting it to what you think you are....if that makes sense

surely even light touching of valve and piston is going to be either catastrophic or quiet very soon after it starts because the valves will make their own wee pockets in the piston?