| Diagram | Fig. 14 — OIL TANK, SIDECOVERS, SILENCER · ref 7 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA Fibre washer, filler cap
Fibre sealing washer for the oil tank filler cap, catalog number 67-0042.
This is a fibre washer that seals the filler cap on the oil tank, catalog number 67-0042 (also shown as 67-42 in older records). It's a simple sealing washer meant to sit between the cap and the tank opening to keep oil from seeping out around the threads.
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It shows up in the parts books under the oil tank and sidecover/toolbox and silencer figures, which is where you'd expect a filler cap seal to live. The catalog entries we have span 1969 to 1970, so that's the window this part number is documented in.
It's a small, easy-to-overlook item, but a worn or hardened fibre washer here is a common reason for oil seeping around the filler cap. Worth checking if you're chasing a weep at the top of the tank.
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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