puzzled
Thread Starter
Heel & Toe
Joined: May 2010
Posts: 15
Likes: 0
From: Springdale newfoundland
puzzled
HI,, just did a complete rebuild on my 1985 vette. kept it stock.
broke it in last year , put aprox 3000 km on it then had to park it for the winter,, just taking it out of storage now and it is smoking blue out the exhaust
,,,(must be oil) where is it comming from????
broke it in last year , put aprox 3000 km on it then had to park it for the winter,, just taking it out of storage now and it is smoking blue out the exhaust
,,,(must be oil) where is it comming from????
Racer
Joined: Jul 2010
Posts: 308
Likes: 2
From: Kansas City MO
Is it still smoking after driving for a while or was that just right upon startup?
If it was only right upon startup I'd guess it was oil that leaked past the valve stem seals over the long winter combined with water (condensation) to make the blue-ish smoke you mentioned.
If it's still smoking after getting the engine hot and running it several miles - you'll have to determine when the smoking is worse - when accelerating or when decellerating in gear (or downshifting)? In general smoke under load is rings, smoke when decellerating is valve guides/seals, and smoke most all the time could be something as simple as an intake gasket leak.
If it was only right upon startup I'd guess it was oil that leaked past the valve stem seals over the long winter combined with water (condensation) to make the blue-ish smoke you mentioned.
If it's still smoking after getting the engine hot and running it several miles - you'll have to determine when the smoking is worse - when accelerating or when decellerating in gear (or downshifting)? In general smoke under load is rings, smoke when decellerating is valve guides/seals, and smoke most all the time could be something as simple as an intake gasket leak.
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
HI,, just did a complete rebuild on my 1985 vette. kept it stock.
broke it in last year , put aprox 3000 km on it then had to park it for the winter,, just taking it out of storage now and it is smoking blue out the exhaust,,,(must be oil) where is it comming from????
broke it in last year , put aprox 3000 km on it then had to park it for the winter,, just taking it out of storage now and it is smoking blue out the exhaust
,,,(must be oil) where is it comming from????Did they knurl the valvestem guides instead of replacing them and carefully honing them to size with a SUNNEN P-30 Honing tool & checking Valve Guide ID the with a calibrated small ball dial bore gauge?
Did they maintain factory spec clearances & control guide taper & runout to within .0001" / 1/10,000 of an inch?
That is what clearance tolerance I hone valve guides out to when I rebuild engine cylinder heads for stock or racing use.
The engine rings may not be sealing too.
Or the engine wasn't broken in yet properly.
Gap the piston rings & check each one for proper end gap clearance?
If too tight the ring ends will but together in operation and the broken piston rings will result along with broken piston ring lands.
