OIL FILTER ASSEMBLY
WOA1230
Oil Filter Complete - Military Junior
Including housing, filter element and mounting hardware
Complete oil filter system in military junior specification. This bypass filtration unit consists of filter housing (canister), filter element, lid gasket, mounting straps and fittings. Suitable for mounting on the cylinder head with the original bracket.
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Type Military Junior canister filter |
Version Complete with housing and element |
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Connection 1/8" NPT fittings |
Kit contents Canister, filter element, gaskets, mounting straps, decals |
Features
- Military Junior standard size (5" diameter housing)
- Bypass filtration system for L-134 engine
- Includes filter element and lid gasket
- Complete with mounting straps and fittings
- Ready for installation on original bracket
★ High-quality reproduction of the original Military Junior filter system. Supplied complete with all necessary parts for direct installation.
Application
Applications by category: Willys MB, Ford GPW (both with L-134 Go Devil engine and bypass filter system), Hotchkiss M201, and early CJ-2A models (1945-1946) with military junior filter. Later CJ-2A sometimes received smaller civilian filter housing. Not suitable for M38 with Cuno filter or F-134 engine.
Installation notes
Mount on cylinder head with original bracket via two C-brackets. Upper hose runs from oil pressure outlet (behind fuel pump) to filter inlet. Lower hose from filter outlet to timing cover (filtered oil return). Use correct 1/8" NPT to 1/4" inverted flare fittings. Tighten lid hand-tight — not too tight, otherwise lid will deform. Filter must be drained manually during service.
Compatibility
PLEASE NOTE: Military Junior filter (5" diameter housing) is larger than civilian CJ filters. Check whether your vehicle still has the original military-size housing. Not compatible with Cuno filter (early production M38) — that is a friction filter with rotary knob. Purolator and Fram Military Junior filters are both correct, differing only in lid shape (Purolator convex, Fram conical). Element (4¾" high, approximately 4¼" wide) also fits Dodge WC-series lorries.
Historical context
WWII Jeeps came standard with a bypass oil filter from the factory, typically Purolator on Ford GPW and predominantly Fram on Willys MB, although both brands were used interchangeably. Military Junior was the standard US Army specification for light vehicles with four-cylinder engine.
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.
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Ford GPW (early) | 1942 |
| Ford GPW | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 (early) | 1956, 1957, 1958, 1959 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
| Willys M38A1 | 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 10-1513 — Maintenance Manual — only for Willys MB / Ford GPW (1942)
