Datsunboy's KP510 SSS Bluebird coupe

[510BRE]

haha yeah i got a phone call informing me about that coupe and the guy that rung me is lookin to buy it ....the guy that has it is an importer




ha found these the other day


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[datsunboy]

sweet pics thanks Shane.

Yeah I could stick the L16 sump and pickup on it.....but if im doing all that, I cant be bothered paying for gaskets and oil twice lol
I'lll just rebuild it, and bike lol

[datsunboy]

righto.....the other night I pulled the engine to bits over a few drinks lol.

Dylan took the block for me, and is giving it a few bath's in his bad ass chemical bath at work....cheers man!

anyway....some pics

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[lewishorrell]

what you find was causing the smoking??

[datsunboy]

probably a combination of oil rings and valve stem seals....

Oil rings could rotate, so weren't seized, but they were pretty tight.
Valve stem seals had gone hard and brittle, so definitely would have been helping the smoking.

There was a wet patch of oil across the head gasket from one of the oil galleries to cylinder #4....but I cant be certain if the wet patch was there before I took the head off or not.
pistons #1 and #4 were both wet with oil, #2 and #3 were dry, but had carbon build up much the same as all pistons

[lewishorrell]

hmmmm sounds strange im trying to relate it to my motor judge if it going to be an easy fix or not

[datsunboy]

haha, sweet....I think the valve guide seals are usually the first culprit in these engines, rings will usually last a bit longer

[classicdat]

A wee test you can do while the engine is running is after a down hill run, (on overrun, Throttle closed - engine breaking coming down hill) if it blows blue when you floor it the rings are gone, generally valve stem seals will give smoke after idling or sitting and opening the throttle, I'm hoping this is what is wrong with mine.
If the rings are shot you will often get 'oil wash' on the piston crown, the carbon around the edge looks to have been washed away leaving the piston clean and exposed. Sorry if this is common knowledge and I am preaching to the choir.

[Mikewazowski]

A wee test you can do while the engine is running is after a down hill run, (on overrun, Throttle closed - engine breaking coming down hill) if it blows blue when you floor it the rings are gone, generally valve stem seals will give smoke after idling or sitting and opening the throttle, I'm hoping this is what is wrong with mine.
If the rings are shot you will often get 'oil wash' on the piston crown, the carbon around the edge looks to have been washed away leaving the piston clean and exposed. Sorry if this is common knowledge and I am preaching to the choir.

I didn't know this ^, so you've taught at least one person something

[lewishorrell]

explains why my piston tops were reasonably clean when i pulled head off lol ahhhhhhhh well bit of oil wash never hurt anyone but the environment and the pocket