SPRING OIL PUMP
The correct style and specification for the WWII MB Ford GPW Spring Oil Pump.
Oil pump spring
Pressure regulating spring
Pressure regulating spring for the oil pump of Willys MB, Ford GPW and Hotchkiss M201 with chain-driven L-134 engine. This spring regulates the oil pressure relief valve and ensures proper lubrication of engine and timing components. Essential part during oil pump overhaul.
|
Function Oil pump pressure relief valve |
Engine type L-134 chain drive |
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Vehicle Willys MB, Ford GPW, Hotchkiss M201 |
Application Oil pump pressure relief valve |
Features
- Pressure regulating spring for oil pump pressure relief valve
- Suitable for chain-driven oil pump (chain driven)
- For L-134 Go Devil engine
- Original specification for WWII MB/GPW
- Critical component for correct oil pressure regulation
★ Replacement of this spring is essential during oil pump overhaul. A weakened or incorrectly adjusted spring causes low or fluctuating oil pressure.
Application
Willys MB (1941-1945), Ford GPW (1942-1945) and Hotchkiss M201 (1955-1966) with chain-driven oil pump. NOT suitable for late CJ-2A, CJ-3A, CJ-3B, M38 or M38A1 with gear-driven oil pump.
Installation notes
The spring sits beneath the adjusting screw of the pressure relief valve in the oil pump. During installation: check correct tension — oil pressure must reach 6 psi at idle and 35-45 psi at 2000 rpm (warm). Shimming with thinner/thicker copper washers adjusts the tension.
Compatibility
ONLY for chain-driven oil pump (chain driven oil pump). The early L-134 engines (WWII MB/GPW, early CJ-2A, M201) use chain drive. Late CJ-2A (from approx. 1948), CJ-3A, CJ-3B, M38, M38A1 have gear-driven oil pump with different pressure relief spring specification.
Historical context
The L-134 Go Devil engine in WWII jeeps used a chain-driven oil pump with floating oil pickup. The pressure relief valve with this spring regulated pressure to engine, camshaft chain and oil filter — crucial for reliability in field conditions.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
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This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
ALL_CATEGORIES : Oil Pump Drive Gear Willys MB Ford GPW M201
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 10-1513 — Maintenance Manual — only for Willys MB / Ford GPW (1942)
