Remove the pressure relief plug-(1),spring-(2), and plunger-(3).
Remove the oil pump gerotor cover-(1) andbolts.Clean all of the parts in cleaning solvent. Remove varnish,sludge and dirt.Inspect the oil pump-(2, 3) for wear and scoring.Ensure that all components are within specifications. Refer toEngine Mechanical Specifications.
Replace the front cover-(4) and oil pump assemblyif it is out of specification or damaged.
Diagnostics
By monitoring and reporting on the
vehicle's key systems, OnStar
Advanced Diagnostics provides a
way to keep up on maintenance.
Capabilities vary by model. See
www.onstar.com for details and
system limitations. Message and
data rates may apply. Advanced
Diagnostics requires an active
OnSt ...