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MiKExAUS

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Hey gang,

Just some more vague information which I would like your opinion on.. ha ha..
After pulling both heads I have found one valve tip & rocker arm to have gouging. The other 15 had no gouging like this (perfectly flat valve tip/smooth rocker arm tip). Wondering if anyone has a similar previous experience and discovered the cause... I am waiting for a tool to check the valve/guide clearance but other things I could think of are:
-Lack of oil supply
-Faulty rocker bearings (trunion seems ok)
-Faulty lifter causing excessive valve lash (the associated lifter was not hard/filled with oil like some others on removal)
-Bent pushrod (the associated one passes the roll test)
Are these a reasonable possibility?

Edit: car has 200k km
 

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shane_3800

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Could be oil supply to the lifter.
Is it at the end or in the middle?

LS engines can have too much clearance on the cam bearings causing pressure drop to the top end.
I would check the cam bearing clearance first if that is out all sorts of oil issues could happen.
 

MiKExAUS

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Could be oil supply to the lifter.
Is it at the end or in the middle?

LS engines can have too much clearance on the cam bearings causing pressure drop to the top end.
I would check the cam bearing clearance first if that is out all sorts of oil issues could happen.
Cylinder 3 intake valve. So sort of at the end but I would consider cylinder 2 to have the lowest oil pressure at any given time.

Thanks for your suggestion. The lifter pushrod seat and pushrod appears good as well as the pushrod seat in the rocker. just not the valve /rocker tip. Fingers crossed the cam bearings aren't shot.
 

lmoengnr

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Cylinder 3 intake valve. So sort of at the end but I would consider cylinder 2 to have the lowest oil pressure at any given time.

Thanks for your suggestion. The lifter pushrod seat and pushrod appears good as well as the pushrod seat in the rocker. just not the valve /rocker tip. Fingers crossed the cam bearings aren't shot.
The pushrod not blocked or restricted?
 

Immortality

Can't live without smoky bacon!
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Lovely shade of brown inside that motor. Possibly a lifter issue if it was soft.
 
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