5 replies to this topic

[schw84]

I have a 2010 Cooper S. It's been knocking for some time now in the enigne, but over the past week when i started it in the morning when cold, it has died as though the automatic choke was dying. The car drinks oil through the turbo, so it could relate to that. Today i changed the timing chains and the knocks still there. If you press your ear to the sump when its running it sounds like the knock is coming from inside. Is there an oil pump in there which is likely to be broken? The car now sounds worse with the new timing chains in it. The car starts ok now, and the chains were fairly bowed when I took them out, so i think that the starting issue was because it keeps running low on oil as i dont always check it (every week) and it drinks oil like its going out of fashion so the tensioner became loose through lack of oil.

 

I have only changed the chains, not the top sprockets someone has suggested that the larger of the sprockets could be worn?

 

Has anyone else had this issue?

 

Thanks

 

Rob

[Durknp]

Stop spamming Durknp..

 

We have rules on Bini-bashing, if this continues a warning will be given.

 

Regards

TMF Team

Edited by myredmini, 14 October 2013 - 06:45 PM.
Spam

[Spud_133]

If it has run low on oil, it may be a bearing noise, which is big bucks.

This forum is predominantly a classic mini forum, however there a few BMW mini owners so may be able to assist. You could try, totalmini.com or mini2

[Durknp]

I'm sorry I was mearley pointing out that this is a classic mini forum as spud says.
With regards to the original op I'm afraid that a knocking noise coming from the bottom of the engine is not normally good news. If the engine has been run low on oil, because it is knowingly leaking through the turbo and the levels in the sump haven't been topped up, then I would suggest its probably dropped a big end bearing which has run dry. This would require a full engine rebuild and crank grind to repair.

As a general rule if you are replacing chains then new sprockets should be renewed at the same time since the teeth will be slightly fish hooked and will wear out the new chain sooner back to the sloppiness of the old one. You say it is sounding worse since the new chains have been put on. Are they properly tensioned so the slack doesn't knock against the cover? If the old chains were so badly worn due to lack of oil that it affected the valve timing slightly then with a new chain on it could possible be experiencing higher compression in the engine due to the valves sealing correctly with respect to the crank timing. If it has dropped a big end bearing then the higher compression will make a louder knock.

I would suggest that the oil pump is ok since it sounds like this has been going on for some time and the turbo and engine would of seized a long time ago if there was no pressure. Has the oil light ever come up on the dash in the car? If so by the time this light comes on its normally too late I'm afraid.

Hope this makes sense
Nick

[myredmini]

As above any fault with the oil pump the turbo will fail quick due to high RPM. I would say knocking is bottom end bearings.

[Durknp]

I'd also suggest dropping the oil and looking what metal is in it. You can take a hacksaw to the filter and spreading out the paper to see what you have