Pinion key on crankshaft
Key for gear on crankshaft
Woodruff key for timing gear
Essential half-moon shaped steel key for securing and positioning the gear on the crankshaft. This Woodruff key ensures correct alignment and prevents gear slippage, crucial for maintaining proper timing of the valve train.
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Type Woodruff key (half-moon key) |
Material Hardened steel |
|
Application Crankshaft gear fitting |
Function Timing positioning |
Features
- Half-moon construction for optimal fit
- Hardened steel for durability and wear resistance
- Precise dimensions for tight fit in crankshaft groove
- Prevents slippage and incorrect valve timing
- Essential component during engine overhaul
★ Always replace the key when removing the crankshaft gear. A worn or damaged key can lead to timing problems and serious engine damage.
Application
Used on engines with gear-driven valve train. The key fits into a milled slot in the crankshaft and gear, preventing the gear from rotating relative to the crankshaft. Critical component for maintaining correct valve timing.
Installation notes
Place the key fully into the crankshaft groove before fitting the gear. The gear should require light tapping, not slide freely. Check that the key sits correctly in both grooves (crankshaft and gear). Never reuse a damaged or worn key.
Compatibility
Note: dimensions vary by engine. Measure the groove in your crankshaft and gear accurately before ordering. Incorrect size results in poor fit and possible loss of timing. If in doubt: bring your old key as reference.
Historical context
The Woodruff key was patented in the late 19th century and became the standard for timing gears in combustion engines. The half-moon shape provides self-centring effect and easy assembly.
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 |