Where is the AFM on a GM LS lifter?
To control contamination a small replaceable oil filter is located in the VLOM inlet oil passageway. The AFM oil pressure relief valve regulates the oil supplied to the VLOM and is located in the oil pan near the oil filter housing. The AFM system has an operating range from 27 PSI to 66 PSI of oil pressure.
Can a poor quality oil cause an AFM lifter to fail?
It’s been seen that putting poor quality oil has led to the failure of AFM lifters. In such situations, you’ll have no other option but to get the lifters replaced. Lack of adequate oil will cause nothing but damage to the lifters, and it’ll ultimately end up in failure.
Where is the oil deflector valve on a GMC ACM?
This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. The original version sprayed oil on the cylinder walls and increased oil consumption. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan.
Where does the VLOM deactivate the AFM lifter?
VLOM applies pressurized oil to the AFM lifters when cylinder deactivation is requested, and shuts off that supply of oil to reactivate those cylinders. Cylinder activation and deactivation are both supposed to occur on the base circle of the cam lobe, making the transition from four to eight cylinder mode unnoticeable to the driver.
To control contamination a small replaceable oil filter is located in the VLOM inlet oil passageway. The AFM oil pressure relief valve regulates the oil supplied to the VLOM and is located in the oil pan near the oil filter housing. The AFM system has an operating range from 27 PSI to 66 PSI of oil pressure.
What is the filter screen on a GM valve lifter?
The screen (see illustration) is actually a filter for the valve lifters on those GM applications equipped with AFM. The purpose of the filter screen is to help control contamination that can affect the AFM hydraulic system by filtering the oil that flows through the valve lifter oil manifold and its related solenoids.
This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. The original version sprayed oil on the cylinder walls and increased oil consumption. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan.
VLOM applies pressurized oil to the AFM lifters when cylinder deactivation is requested, and shuts off that supply of oil to reactivate those cylinders. Cylinder activation and deactivation are both supposed to occur on the base circle of the cam lobe, making the transition from four to eight cylinder mode unnoticeable to the driver.