PISTONS SIZE 010 (SET OF 4)
Set of 4 engine pistons dimension 0.010" (Ø=79.62mm), delivered with their pins.
Suitable for Jeep Willys MB, M38, M38A1, CJ2A, CJ3A, CJ3B, CJ5, CJ6, Hotchkiss M201 and Ford GPW
Pistons size.010 oversized
Set of 4 pieces with piston pins
Set of four oversized pistons for engine overhaul of the L-134 engine. These pistons have a diameter of 79.629 mm (3.135"), which is 0.010" (0.254 mm) larger than standard. Supplied including piston pins.
|
Oversize 010" (0.254 mm) |
Diameter 629 mm (3.135") |
|
Engine L-134 Go Devil |
Set contents 4 pistons + 4 piston pins |
Features
- Oversized pistons for engine overhaul
- 0.010" (0.254 mm) larger than standard
- Standard piston diameter: 79.375 mm (3.125")
- Complete with piston pins
- Suitable after boring cylinders to +0.010"
★ Quality pistons for professional engine overhaul. Essential component during engine rebuild when cylinders are bored to first oversized dimension.
Application
These oversized pistons are used during engine overhaul when the cylinders have been bored or honed to 0.010" oversized. Important: cylinder diameter must be precisely matched to piston size. Piston-to-cylinder clearance must be between 0.0015" and 0.0020" (0.038-0.051 mm). Have a skilled engine machinist bore the cylinders with the pistons available to guarantee correct fitting.
Installation notes
CRITICAL: provide these pistons to the engine machinist before the cylinders are bored. The cylinders must be bored and honed with the pistons available to ensure correct piston clearance of 0.0015-0.0020". Piston pins are press fit in the piston. Check piston pin clearance in connecting rod: 0.0003-0.0010".
Compatibility
Note: the L-134 engine has different variants. Early models (MB, GPW, early CJ-2A) have chain-driven camshaft, later models (late CJ-2A, CJ-3A, M38, CJ-3B) have gear-driven camshaft. These pistons fit both variants. Not compatible with F-134 Hurricane engine (higher cylinder heads). Available oversizes for overhaul: standard, +0.010", +0.020", +0.030", +0.040", +0.060".
Historical context
The Willys L-134 'Go Devil' engine was the powerful four-cylinder flathead engine that powered nearly all American and Allied jeeps during WWII. Developed by chief engineer Delmar 'Barney' Roos, this robust engine remained in production until the early 1950s across various jeep models.
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 |
| 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)
