PISTONS SIZE 040 (SET OF 4)
0.040“ (1,016mm) → 80,391mm (3.164“)
Set of 4 engine pistons dimension 0.040" (Ø=80.39mm), delivered with their pins.
Suitable for Jeep Willys MB, M38, M38A1, CJ2A, CJ3A, CJ3B, CJ5, CJ6, Hotchkiss M201 and Ford GPW
Pistons size 040 (set of 4)
Oversize pistons with piston pins
Complete set of four oversize pistons (0.040") with corresponding piston pins for engine overhaul. These pistons are used when reboring cylinders during an engine rebuild when the standard size is no longer adequate due to wear.
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Oversize 040" (1.016 mm) |
Piston diameter Ø 80.39 mm (3.165") |
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Application L-134 & F-134 engines |
Set contents 4 pistons + 4 piston pins |
Features
- Oversize 0.040" for rebored cylinders
- Complete with piston pins
- Suitable for both L-head (flathead) and F-head engines
- For 134 ci (2,199cc) four-cylinder engines
- Standard bore 3.125" + 0.040" oversize
★ High-quality oversize pistons for professional engine overhaul of 134 ci four-cylinder engines. Set supplied complete with piston pins.
Application
For engines with cylinder blocks bored 0.040" (1.016 mm) oversize. The standard piston diameter of 79.375 mm (3.125") is thereby increased to 80.39 mm (3.165"). Suitable for both the L-134 flathead engine (with side valves) and the F-134 overhead valve engine.
Installation notes
Cylinder blocks must be bored and honed to exactly 0.040" oversize by a specialist engine workshop. The workshop must have the pistons in hand beforehand to verify correct fitting with a pull gauge. Piston clearance in cylinder: 0.0015 to 0.0020 inch (0.038 to 0.051 mm) according to TM specifications. Piston rings are not included and must be ordered separately in 0.040" oversize.
Compatibility
These pistons fit both the L-134 'Go Devil' flathead engine and the F-134 'Hurricane' overhead valve engine. Both engines share the same bore and stroke (3.125" x 4.375"). Note: always verify the exact bore of your cylinder block before ordering pistons. Other oversize dimensions (.010,.020,.030,.060) are also available.
Historical context
The 134 ci four-cylinder engine was the reliable powerplant of countless military and civilian jeeps from 1941 onwards. The L-134 flathead version initially powered the Willys MB and Ford GPW during WWII, whilst the improved F-134 overhead valve version was adopted from the 1950s.
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 : Piston,Rings & Bearings CJ2A, Pistons And Sleeve CJ3A, Piston,Rings & Bearings M38, Pistons And Sleeve - M38, Pistons And Sleeve CJ3B
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 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
| Willys M38 | 1950, 1951, 1952 |
| 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 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
| Jeep CJ-5 | 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983 |
📐 Diagrams & technical drawings
From the original Technical Manual CJ2A_PL_1949 — Parts List — only for Willys CJ-2A / CJ-3A (1949)
From the original Technical Manual TM 10-1513 — Maintenance Manual — only for Willys MB / Ford GPW (1942)
