Enclave FWD V6-3.6L (2008)
not removed and oil passages are not being checked in many cases. Technicians need to inspect for oil galley obtrusion, which is a source for oil
starvation and bearing life in some cases.
2. One source for oil starvation is due to aftermarket oil filter anti-drain back valves deterioration. Orange silicone rubber material has been found in
many cases of oil starvation underneath the main and rod bearings, with material contained in the oil lubrication galley in both blocks and
crankshaft lubrication holes. The orange silicone rubber is from aftermarket oil filters anti drain back valve assembly, which is located under the
filter media and above the screw on the base. Orange silicone rubber is not used in the assembly of the High Feature V6 as well as most GM
engine applications. Examples are below.
Rod bearing welded to crankshaft (1).
Orange silicone rubber obstructing the oil flow to the main and rod bearings in the engine block webbing (1).
Silicone rubber found in main and rod bearing and in the piston skirt squirters (sprayers) (1).
Sprayer is removed to show obstruction material.
3. Such related failures as shown in the examples above are not considered to be warranty by General Motors.
Example of Aftermarket Filter Failures
First do a general inspection for possible source. With the metal can cut off, you can see detail of media failure.
