Slight engine rattle

[Pistol968]

I get a slight engine rattle when switching off after a run. Is this normal? its on a 2.8 Pre facelift.

[Mike Fishwick]

It's not normal, but could be something as simple as a worn viscous fan coupling - check it for play, or remove it and see what happens.

If you have air con, also check the compressor clutch for play.

Are you sure the rattle is not present all the time the engine is running?

[Pistol968]

Thanks Mike, I will check but pretty sure engine runs as sweet as a nut with no oil loss etc and temps all fine. It just happens when I switch it off and its "closes down" literally for one second after the key is turned off.

[veef13]

I have this too, try shutting down engine with clutch depressed, is it quiet now?

Sent from my Desire S using Tapatalk 2

[Pistol968]

Thanks- will give it a go today and report back.

[Pistol968]

Yep - just tried it with the clutch depressed after a spirited run and no noise at all- what does this mean??

[veef13]

I'll get exact name for the part making the noise for you on Friday, my Indy said its the lay shaft?, well I think that's what he said Either way, nothing to worry about, apparently common issue on these he's seen loads, and I've heard a few M's with same noise on YouTube vid too

Will write down the exact name of issue when I'm at Indy Friday for new brakes

Sent from my Desire S using Tapatalk 2

[walrus5668]

could be the timing chain tensioners too...its a common problem on m52 engines. Most make the mistake of thinking this rattle is the vanos but most of the time its just the tensioners. Its still a bitch of a job

[Andyboy]

Yep - just tried it with the clutch depressed after a spirited run and no noise at all- what does this mean??

No problem - the noise when you shut down is the gearbox layshaft bearings having a rattle. They do that when they have some miles on the clock and all you do is depress the clutch as you shut if off. Even if you don't, it won't do any harm.

[Pistol968]

Thanks good to know its nothing serious! Its only done 53000 miles so I guess these can start to rattle even at relatively low miles.

[veef13]

Glad to read that too and confirms what I wrote above that my Indy suggested

Sent from my Desire S using Tapatalk 2