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Oil on top of pistons
Posted: Tue Oct 25, 2011 8:53 pm
by 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?
Re: Oil on top of pistons
Posted: Tue Oct 25, 2011 9:45 pm
by Storm
spetz wrote: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
Re: Oil on top of pistons
Posted: Tue Oct 25, 2011 11:01 pm
by 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
Re: Oil on top of pistons
Posted: Wed Oct 26, 2011 7:50 am
by 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?
Re: Oil on top of pistons
Posted: Wed Oct 26, 2011 10:51 am
by 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
Re: Oil on top of pistons
Posted: Fri Nov 04, 2011 1:03 pm
by payaya
Copped the same thing. Was too lazy to clean the tube and the old oil leaked onto the new plug.