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AFM DOD Lifter Bucket Kit Holden VE VF V8 6.0L L77
$700
This is a full kit of lifters and buckets for the AFM motors!Kit includes: 8 DOD/AFM GM Lifters, 8 Standard GM LS7 Lifters, and 4 Lifter Guide Trays
Replaces: ****9256, ****1595, ****9820, ****9516, HL177, HL178No Warranty: These lifters do not come with any kind of warranty due to the fact that the DOD/AFM system often fails which in return causes the lifters to fail. We highly recommend switching to a traditional Lifter with one of our complete DOD/AFM Lifter Delete Kits
AFM DOD Lifters Technical Bulletin: GM LS AFM Deactivation Lifter Issues. We have noticed an increase in the issues surrounding the replacement of deactivation lifters in GM LS engines with Active Fuel Management or AFM. After installing new lifters, the original issue may not have been corrected. We have found that most lifter faults are caused by oil pressure issues, or control issues. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters. 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. At higher engine speeds the high side of this operating range is controlled by the AFM oil pressure relief valve. At low engine speeds the low side of the operating range will depend on the engines ability to produce oil pressure using the flow of oil from the oil pump. The AFM lifter bores in these engines have a spec of .843-.844, and the deactivation lifters require 22 PSI of pressure to release the locking pins. Taking these two things into consideration a lifter bore that is even slightly worn could bleed off enough oil pressure to prevent the lifter from unlocking. In addition, it has been reported that it is common to find the VLOM oil filter plugged and needing replacement on high mileage engines with miss-fire fault codes. We have seen lifters that has been stuck compressed, this condition can be caused by the VLOM commanding activation or deactivation at the wrong point in the cam’s rotation, either in the ramp, or at the lobe peak. Any time an engine has failed AFM lifters the lifter guides must be replaced, the lifter bores must be measured, and the VLOM must also be tested for proper operation, or replaced. In addition the VLOM oil filter must be replaced as well.
Replaces: ****9256, ****1595, ****9820, ****9516, HL177, HL178No Warranty: These lifters do not come with any kind of warranty due to the fact that the DOD/AFM system often fails which in return causes the lifters to fail. We highly recommend switching to a traditional Lifter with one of our complete DOD/AFM Lifter Delete Kits
AFM DOD Lifters Technical Bulletin: GM LS AFM Deactivation Lifter Issues. We have noticed an increase in the issues surrounding the replacement of deactivation lifters in GM LS engines with Active Fuel Management or AFM. After installing new lifters, the original issue may not have been corrected. We have found that most lifter faults are caused by oil pressure issues, or control issues. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters. 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. At higher engine speeds the high side of this operating range is controlled by the AFM oil pressure relief valve. At low engine speeds the low side of the operating range will depend on the engines ability to produce oil pressure using the flow of oil from the oil pump. The AFM lifter bores in these engines have a spec of .843-.844, and the deactivation lifters require 22 PSI of pressure to release the locking pins. Taking these two things into consideration a lifter bore that is even slightly worn could bleed off enough oil pressure to prevent the lifter from unlocking. In addition, it has been reported that it is common to find the VLOM oil filter plugged and needing replacement on high mileage engines with miss-fire fault codes. We have seen lifters that has been stuck compressed, this condition can be caused by the VLOM commanding activation or deactivation at the wrong point in the cam’s rotation, either in the ramp, or at the lobe peak. Any time an engine has failed AFM lifters the lifter guides must be replaced, the lifter bores must be measured, and the VLOM must also be tested for proper operation, or replaced. In addition the VLOM oil filter must be replaced as well.
- Date Listed:05/07/2022
- Last Edited:05/07/2022
- Condition:New
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