PINION CRANKSHAFT CHAIN 18 TEETH
WO638459
Crankshaft Timing Chain Sprocket 18 Teeth
For L-134 engine with chain drive
Crankshaft sprocket for the L-134 'Go Devil' engine with chain-driven camshaft. This sprocket has 18 teeth and is used in combination with the timing chain. The crankshaft is cross-drilled at the front for oil supply to the crankshaft sprocket.
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Application L-134 chain drive |
Number of teeth 18 teeth |
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Part number WO638459 |
Engine type 4-134 CI L-head flathead |
Features
- 18-tooth crankshaft sprocket for timing chain
- For L-134 engine with chain-driven camshaft
- Crankshaft has oil drilling for sprocket lubrication
- Original Willys part number WO638459
- Fitted with Woodruff key to crankshaft
★ Original-specification replacement part for restoration of chain-driven engines.
Application
This crankshaft sprocket is specific to L-134 engines with chain-driven camshaft. This configuration was used in all Willys MB (1941-1945), Ford GPW (1941-1945), Hotchkiss M201, and early CJ-2A (up to engine serial number 44417, mid-1946). Later, timing gears were introduced. Check that your engine has chain drive before ordering.
Installation notes
When fitting the timing components, the timing mark on the crankshaft sprocket must be opposite the timing mark on the camshaft sprocket. The Woodruff key must be correctly positioned in the crankshaft slot. Check the oil drilling in the crankshaft — this must be present for chain lubrication.
Compatibility
IMPORTANT: This part does NOT fit gear-driven engines. From mid-1946 (engine serial number 44418 onwards), most CJ-2A, all CJ-3A, CJ-3B and M38 engines used direct gear drive without chain. Check your engine configuration: chain drive has engine block casting 638632, gear drive typically has casting 641087.
Historical context
The L-134 'Go Devil' engine with chain drive was standard during WWII production of the ¼-ton 4x4 truck. After the war, Willys switched to direct gear drive for greater reliability and simpler maintenance.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
⚠ Spotted an error in this description? Report it to info@willys.be
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 | 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 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 10-1513 — Maintenance Manual — only for Willys MB / Ford GPW (1942)
