Roojai

As I have mentioned in my post
http://bbs.scoobynet.co.uk/showthread.php?t=395674
I am getting a bit of oil burning and therefore smoke coming from my exhaust. I am getting it checked tomorrow. The place I am getting it checked at changed my cambelt and cambelt tensioner very recently, and it's just occurred to me that that work may be the cause of the problem.


I am not just assuming they did something wrong, I know these type of things are usually unrelated coincidences, but just want to prepare myself with info.

Could a poorly done cambelt change (including tensioner) result in a smokey exhaust, but otherwise nicely running engine?

RichA

No it can't. If the timing was out(you'd almost certainly know if it was though!) then you'd probably have lots of nasty noises as valves and pistons meet up.

Burning oil - worn valve stem seats, worn rings or bores, or turbo seals.

--Rich

mart360

hmm... when i had the wifes twin cam in for a belt change, the dealer said it was possible to be one tooth out on a change and not have a valve to piston incedant

mind you the power delivery wouldnt be spot on

M

Trashman

I think this has been discussed before - it depends on engine design and if it is an "interference" (IIRC) engine - i.e the valves enter the space that the piston does during normal operation, but at different times. Seem to recall that the scoob was either non-interference or semi-interference. But this was more related to if a belt slipped or snapped. Can't see it would cause oil burning and definitely performance would be off.

scoobfan

Just a thought, did the garage change the oil?

If so check the level, they may have overfilled it causing increased pressure, enough to breech the seals.

It's been known to happen.

RichA

Depends on the engine - sometimes they can get away with being a tooth out, but you generally lose performance. It won't lead to oil being burnt though...

For oil to be burnt, it needs to slip through somewhere - piston rings, valve seals/guides, etc. Makes no odds when the cam rotates regarding the crank in such instances, it'll either have oil leaking past or it won't .

--Rich

--Rich

Roojai

I thought perhaps that the valve stems could have been bent a bit during the installation of the cambelt, resulting in a bad seal.

Oil is fine on engine, it looks like it is a turbo oil seal issue now.