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Chevy Gm 5.3l Afm Dod Replacement Kit Gaskets Lifters Trays Head Bolts Vlom

Chevy Gm 5.3l Afm Dod Replacement Kit Gaskets Lifters Trays Head Bolts Vlom

Chevy Gm 5.3l Afm Dod Replacement Kit Gaskets Lifters Trays Head Bolts Vlom
2007 - 2014 Active Fuel management Engines Only 5.3L. Full set of Lifters (including AFM Lifters). Valve Grind Gasket Set including MLS Head Gaskets. Manufacturers 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. All Oil passages to the lifters must be cleaned and blown clear. Any debris or constriction of oil flow will cause lifters to fail again. 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.

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. The item "CHEVY GM 5.3L AFM DOD REPLACEMENT KIT GASKETS LIFTERS TRAYS HEAD BOLTS VLOM" is in sale since Wednesday, September 26, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Camshafts, Lifters & Parts". The seller is "northernautoparts" and is located in Sioux City, Iowa.

This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.

  • Fitment: GM, Hummer, Isuzu, Saab Trucks Vans SUVs
  • Lifter Type: Hydraulic Roller
  • Interchange Part Number: ht2303, ht2281
  • Manufacturer Part Number: NP-GM5.3AFM-Vlom
  • Other Part Number: HB288, L2303-8, L2281-8, C325HS-B
  • Brand: Northern Auto
  • Fitment Type: Direct Replacement
  • Warranty: Unspecified Length
  • California Prop 65 Warning: WARNING: Motor vehicle automotive parts contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm.

    These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


    Chevy Gm 5.3l Afm Dod Replacement Kit Gaskets Lifters Trays Head Bolts Vlom