Right, mate has just got a cossie but its smoking quite badly when you come off the throttle. There is no smoke at all on start up or normal driving ......when youve been on boost and lift off only then does it start to smoke a lot then when you go back on the throttle you get a puff too.
I think i can eliminate rings coz it would smoke all the time but not sure if its turbo or valve guides.

Any advice welcome before he spends money on the wrong bits

 

Turbo would be my guess, but hard to tell without looking.

Especially when backing off, do you get smoke on idle at all after a good run

 

Might be overfueling on the overrun ?

Steve.

 

True

Is it blue or black smoke

 

sorry....forgot to mention its blue smoke

 

I would go with turbo, possible rebuild time i am affraid, Blue points to oil related, take of the filter pipe and see how much play there is in the shaft if there is definate up and down movement (you will prob feel a little click), thiswould point out itsworn, it also could be rear oil seals in the turbo

Sorry

 

ive already checked for play in shaft and theres pretty much none at all.

I thought worn valve guides had the same effect but i dont think this would cause the excessive amount of smoke which is being produced

 

How much can i expect to pay for a good rebuild on a T34 and where is a good place to get it done in the south

 

you need to do a bit more investigation maybe, before sending your turbo off etc,

 

yeah i know....im gonna make some enquires in the morning .....like i said i dont want my mate to spend big bucks on a new turbo if its not that causing the problem.

 

If its happening under vacuum conditions only, it sounds like it could well be stem seals IMHO