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![High Volume Standard Pressure Oil Pump with Screen for Jeep 3.8L, 4.2L [Cast Iron]](https://www.jegs.com/images/mini_750/600/689/689-m-81ahv-s3.jpg)
Vehicle Info NeededMELLINGPART NUMBER: 689-M-81AHV-S3
High Volume Standard Pressure Oil Pump with Screen for Jeep 3.8L, 4.2L [Cast Iron]
$20350
Ships on 09/14/2026
Lowest Price GuaranteeHigh volume gear type oil pump supplied with pickup screen and gasket for an inline six rebuild.Fits Jeep 3.8L and 4.2L engines High volume, standard pressure 0.630 in. pickup tube diameter Cast iron housing and cover
Oil pressure that sags at idle on a high mileage inline six is usually a clearance problem the pump has to work around. A high volume pump moves more oil per revolution to hold pressure at low engine speed, which is why it is a common choice on a Jeep 4.2L rebuild.
Melling M-81AHV-S3 Pump Specifications
- Gear type pump, high volume with standard pressure, driven by a drive shaft.
- 4.75 in. width and 3.56 in. height with a cast iron housing and cover.
- 0.630 in. pickup tube diameter with two 0.315 in. mounting holes.
- Pickup screen, pump cover, gears and gasket included; intermediate shaft and drive shaft are not.
Part TypeOil Pump
BrandMELLING
Package Height3.56 in.
Package Width4.75 in.
Weight5.04 PG
Part CategoryReplacement Parts
Drive Shaft IncludedNo
Housing MaterialCast Iron
Mounting Hole Quantity2
Adjustable Bypass PressureNo
Bolts IncludedNo
Spacer IncludedNo
Alternate Pressure Springs IncludedNo
O-Ring IncludedNo
Washers IncludedNo
Mounting Hole Diameter0.315 in.
Oil Pump Pressure TypeStandard Pressure
Bushing IncludedNo
Oil Pump TypeGear
Cover MaterialCast Iron
Shaft MaterialNot Applicable
Pickup Screen IncludedYes
Gear MaterialSteel
Pickup Tube Diameter0.630 in.
FinishRust Preventative
Gasket Or Seal IncludedYes
Cotter Pin IncludedNo
Drive TypeDrive Shaft
Oil Pump Volume TypeHigh Volume
Part FitmentDirect Fit
Grade TypeImproved Design
Timing Cover IncludedNo
Additional Volume Over Stock Percentage25%
Vendor Part NumberM-81AHV-S3
Package Qty1
Package TypeEA
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