PI0969

Bulletin No.: PI0969
Date: May-2013
Subject:
High Oil Pressure on Startup After Engine Replacement
Models:
1996-2002 Chevrolet Pickups and Vans
1996-2002 GMC Pickups and Vans
5.7L Engine (RPO L31)
5.7L Engine (RPO ZZ4 – GM Performance Parts Engine Only)
with Package Date Between 13058 and 13066
Condition/Concern
Some customers and/or technicians may comment on high oil pressure on initial startup. Oil pressure may exceed 100 psi. This high oil pressure can swell the
oil filter can.
The oil pump to pickup tube attachment may have been made with the wrong locking material. The material can get into the oil pressure relief valve and cause
it to stick shut, driving the oil pressure high.
Recommendation/Instructions
Example of Package date:
(1) Year – 13
(2) Day – 087
Technicians should replace the oil pump when servicing these engines either installed in vehicles or prior to engine installation.
Replace the oil pump on the following engines:
Engine Part Number
Description
24502609
L31 Engine
12530282
L31 Engine
12530283
ZZ4 Engine
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Parts Information
Part Number
Description
93442037
PUMP, OIL
12550042
SCREEN, ASO/PMP
10046007
BOLT, PUMP & SC
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
4066078
Oil Pump Replacement (Engine Not Installed in Vehicle)
1.5 hrs
4066070
Oil Pump Replacement (Engine Installed in Vehicle)
Use Published Labor
Operation Time
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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