| Diagram | Fig. 3 — Engine: Contact Breaker, Timing Cover, Oil Pump, Oil Pressure Relief Valve · ref 34 |
| Subsystem | engine bottom |
| Listed in parts books | 1971–1973 |
Norton Oil Pressure Relief Union Nut Washer
A washer that seals the oil pressure relief union nut in the engine's bottom end lubrication system.
NMT2057 is a washer that seats under the oil pressure relief union nut in the engine's bottom end. It shows up in the parts-book figures covering the contact breaker, timing cover, oil pump, and oil pressure relief valve area, which places it right in the lubrication system where the relief valve assembly threads into the crankcase.
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This washer's job is to seal that union nut so oil pressure doesn't leak past the joint. It's a small part but if it's flattened, cracked, or missing, you can end up with an oil leak or a pressure reading that doesn't look right.
Our catalog record ties this one to appearances across 1971 to 1973, but we don't have more detail on which specific models beyond that. Give us a call and we'll help confirm fitment before you order.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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