Oil on top of pistons

[spetz]

Hi guys,

I was helping a friend with his 6G72. 361,000km +
Tube seals were leaking, replaced them.
Now, took the spark plugs out and there is oil all over them including the thread and the igniting bit + oil on top of the pistons.

What could this be?
Valve stem seals?
Head gasket?
Piston rings?

[Storm]

Hi guys,

I was helping a friend with his 6G72. 361,000km +
Tube seals were leaking, replaced them.
Now, took the spark plugs out and there is oil all over them including the thread and the igniting bit + oil on top of the pistons.

What could this be?
Valve stem seals?
Head gasket?
Piston rings?

Could be any or all of them I'm afraid, although I reckon you would have seen HG failure before now

[spetz]

Well, if it was piston rings would the oil actually be on top of the piston? Or would it all blow out?
I am thinking it's most likely valve stem seals which are leaking

[Bennoz]

At 361,000kms, agreed, could be all of them. I'd imagine those valve seals would be mighty hard & the bored rather glazed. Does it blow any smoke?

What torque are you nipping up the rocker cover bolts?

[spetz]

From some research it seems that hopefully some oil from the tubes just leaked down.
I did the torque by hand, not too tight. I didn't have a torque wrench to do it accurately

[payaya]

Copped the same thing. Was too lazy to clean the tube and the old oil leaked onto the new plug.