what would cause an engine to smoke after about 5 to 10 minutes of running smoke bellows out of the exhaust. new turbo fitted, valve stem oil seals done. there is no smoke on start up at all. any help would be great

 

What colour is the smoke?

 

Think is grey/white.

 

sounds like turbo seal. mine has been doing exactly the same thing. does it go away after a run?

 

No mate once it's warm it's constant smoke. It had a new turbo from cr turbo and did not change.

 

Did you drain/flush out the intercooler when you fitted the new turbo? Could be full of oil from the old turbo if the seals had gone on it.

 

Yes all was taken off when fitting the turbo and checked. Cleaned feed and drain also.
It's had a new felpro head gasket.

 

Does the grey/white smoke smell like oil or burning antifreeze?

How did you clean the intercooler and all air pipes/hoses?

Possibly be unburnt oil in the exhaust system? Could take a while to burn it off.

 

what modifications were done to accomodate a breather system when the zvh conversion was done??

 

All parts washed in parts cleaner the rinsed with water and dried. But to be fair not to contaminated in the first place.
It's bailey oil breather. Breather in back of block.
It does smell but not like oil though.

 

Are you loosing any fluids ie antifreeze or oil or are they all stable?

 

Grey/white is most likely water (steam), turbo oil seal would be very obviously blue (oil)..... Water will be head gasket, cracked head/block.