[Z06] Oil Consumption
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Drifting
Joined: Nov 2001
Posts: 1,684
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From: Jacksonville Florida
Oil Consumption
Forwarded without comment but for your information:
Subject: Higher Than Expected Oil Consumption
Models: 1999-2001 Camaro, Firebird
1999-2002 Corvette
Condition: Some owners may comment on higher than expected oil consumption. when checked, the oil consumption coould be in the range of 400-600 miles per quart.
On the LS6 engines only, the technician may find oil behind the engine throttle plate and in the intake manifold.
Cause: The cause for this condition may be an interaction between the piston rings and the cylinder bore in vehicles that are operated at higher RPMs - typically manual transmission vehicles driven in a manner where the engine is frequently or consistently operating at greater than 3200 RPM.
On the LS6 engine only, the engine has a unique aluminum valley cover that has composite oil separating baffles and PCV plumbing incorporated. In some cases, the PCV baffle may not be properly sealed to the valley cover, causing oil to enter the PCV system.
Correction: On the LS6 engine only, replace the engine valley cover if oil is found behind the throttle body or in the intake manifold before replacing the piston ring.
A new set of piston rings is currently available through GMSPO. The new rings are part of a complete piston ring kit. Install only the #2 compression ring and the oil expander ring from the piston ring kit. All other tings in the ring kit should be discarded. The #1 compression ring and the oi ring rails shoud be re-used in thier original positions on the pistion. All pistons should be used in the same cylinder bore.
Important: Do not dress or hone the cylinder bore. Notthing should be done to change the bore finish for this condition. Changing bore finish may aggravate the conditon.
The #1 compression ring and the upper lower oil expander rails are re-used because they are already broken in for the bore that they are in. The new #2 compression ring is made with a very sharp edge that will break in quickly.
Changing only the piston rings noted, with no change in driving style, should change oil consumption to an acceptable level. Changes indriving style that reduce the amount of time spent at higher RPMs will also positivley affect oil comsumption.
In addition to the standard size piston ring kit, a 0.25mm oversized piston kit is available. the oversized piston ring kit should only be used in those rare instances where the cylinder bore size has been machined larger to accommodate the 0.25mm oversized piston rings.
Les
Subject: Higher Than Expected Oil Consumption
Models: 1999-2001 Camaro, Firebird
1999-2002 Corvette
Condition: Some owners may comment on higher than expected oil consumption. when checked, the oil consumption coould be in the range of 400-600 miles per quart.
On the LS6 engines only, the technician may find oil behind the engine throttle plate and in the intake manifold.
Cause: The cause for this condition may be an interaction between the piston rings and the cylinder bore in vehicles that are operated at higher RPMs - typically manual transmission vehicles driven in a manner where the engine is frequently or consistently operating at greater than 3200 RPM.
On the LS6 engine only, the engine has a unique aluminum valley cover that has composite oil separating baffles and PCV plumbing incorporated. In some cases, the PCV baffle may not be properly sealed to the valley cover, causing oil to enter the PCV system.
Correction: On the LS6 engine only, replace the engine valley cover if oil is found behind the throttle body or in the intake manifold before replacing the piston ring.
A new set of piston rings is currently available through GMSPO. The new rings are part of a complete piston ring kit. Install only the #2 compression ring and the oil expander ring from the piston ring kit. All other tings in the ring kit should be discarded. The #1 compression ring and the oi ring rails shoud be re-used in thier original positions on the pistion. All pistons should be used in the same cylinder bore.
Important: Do not dress or hone the cylinder bore. Notthing should be done to change the bore finish for this condition. Changing bore finish may aggravate the conditon.
The #1 compression ring and the upper lower oil expander rails are re-used because they are already broken in for the bore that they are in. The new #2 compression ring is made with a very sharp edge that will break in quickly.
Changing only the piston rings noted, with no change in driving style, should change oil consumption to an acceptable level. Changes indriving style that reduce the amount of time spent at higher RPMs will also positivley affect oil comsumption.
In addition to the standard size piston ring kit, a 0.25mm oversized piston kit is available. the oversized piston ring kit should only be used in those rare instances where the cylinder bore size has been machined larger to accommodate the 0.25mm oversized piston rings.
Les
Drifting
Joined: Jul 2000
Posts: 1,912
Likes: 0
From: South Florida
