Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

[LS1] Valve tip & rocker wear cause

MiKExAUS

Member
Joined
Jul 13, 2011
Messages
288
Reaction score
10
Points
18
Location
Sydney NSW
Members Ride
VX SS A4 Series II
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
 

Attachments

shane_3800

Well-Known Member
Joined
Aug 13, 2011
Messages
3,237
Reaction score
1,061
Points
113
Age
33
Location
places
Members Ride
vr commo
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

Member
Joined
Jul 13, 2011
Messages
288
Reaction score
10
Points
18
Location
Sydney NSW
Members Ride
VX SS A4 Series II
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

Well-Known Member
Joined
Jan 15, 2012
Messages
4,515
Reaction score
11,114
Points
113
Location
Sunbury Vic.
Members Ride
MY12.5 Maloo R8, MY12 Redline ute, Magnum 224
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!
Staff member
Joined
Apr 15, 2006
Messages
17,934
Reaction score
7,055
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX s2 Calais S/C
Lovely shade of brown inside that motor. Possibly a lifter issue if it was soft.
 
Top