The EAZ Oil Pump Worm Nut is a replacement engine component designed for Royal Enfield Old Model Bullet motorcycles with Cast Iron (CI) engines.
The worm nut works as part of the mechanical oil pump drive mechanism inside the timing chest. It engages with the oil pump drive system and plays an important role in maintaining proper oil circulation within the engine.
This product is suitable for restoration, engine rebuilding and replacement of a worn or damaged original worm nut on compatible old-model Royal Enfield Bullet engines.
Important: Old Royal Enfield Bullet worm nuts can vary according to engine/model and production period. Please match the existing part and engine configuration before ordering. The worm nut uses a left-hand thread, so correct installation direction is important.
Key Features
- EAZ aftermarket replacement part
- Oil Pump Worm Nut
- Designed for Old Model Royal Enfield Bullet
- Suitable for Cast Iron / CI engine applications
- Used in the oil pump drive/timing assembly
- Ideal for engine restoration and repair
- Replacement for worn or damaged worm nut
- Precision-machined replacement component
- Left-hand thread design as applicable to the original assembly
Compatibility
Suitable for compatible Royal Enfield Old Model Cast Iron Bullet applications, including:
- Bullet 350 Cast Iron
- Bullet 500 Cast Iron
- Bullet Standard
- Other compatible old-model CI Bullet variants
Not suitable for modern UCE/J-Series Bullet or Classic engines. Always match the existing worm nut, oil pump spindle and engine configuration before ordering.
Application
- Oil pump drive assembly
- Timing chest / timing gear assembly
- Old Bullet engine rebuilding
- Oil pump worm nut replacement
- Vintage Royal Enfield restoration
Package Contents
- 1 × EAZ Oil Pump Worm Nut
Installation
Professional engine mechanic installation is strongly recommended. The oil pump worm nut is an internal engine/timing assembly component and requires correct removal, thread engagement and tightening.
Important: The worm nut has a left-hand thread on applicable old-model Bullet assemblies. Incorrect removal or installation direction can damage the component or engine threads.











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