Enclave FWD V6-3.6L (2008)
3. When the location is determined, the technician should remove the valve cover and inspect the lifters for aeration. Remove the stationary hydraulic
lifter assemblies (SHLA) for the suspect location / cylinder. For Example; Bank 2 Cylinder # 1 A & B exhaust lifters are making noise. Inspect the
lifters for the presence of oil. If oil is present, SHLA will be pumped and hard to compress. If aeration is present, the lifter will be spongy. Test by
trying to compress with your fingers or a suitable tool.
4. Spongy SHLA (lifters) mean aeration and obstruction to flow oil to SHLA is present. Reference the oil lubrication description document in SI for
details of system operation.
5. (A) Bank 1 (2, 4, 6) Reference 1-Intake oil galley for lifters, Reference 2-Camshaft Actuator (Phaser) Oil Galley, Reference 3- Exhaust Oil Galley
for Lifters.
(B) Bank 2 ( 1, 3, 5) Reference 1-Intake oil galley for lifters, Reference 2-Camshaft Actuator (Phaser) Oil Galley, Reference 3- Exhaust Oil Galley
for Lifters.
An obstruction to oil flow is present at the engine block deck passage under the head gasket for lifter oil pressure. The passage is the location in
the front engine block deck. The oiling passage can be identified as a hole with eye brows cut to each side. See figures above.
6. One example of obstruction is shown above. Filter media material plugging the 2 mm lubrication passage hole creating aeration in the exhaust
lifter oil galley. The obstruction can be filter media material or an orange silicone rubber material. The above example is filter media.
7. Engine oil passages will have to be cleaned of aftermarket filter media debris or orange silicone rubber.
Engine Knocking / Piston Skirt Knock-Topic 2
1. Follow the procedures in SI for the source of a knock condition. Additional diagnosis is required by removal of the oil pan for main and rod
bearing inspection. Further inspection for the source of bearing failure is required. Recent failed engine analysis reviews reveal the bearings are
