| Diagram | Fig. 11 — OIL TANK, SIDECOVERS, SILENCER · ref 16 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA Fibre washer, oil pipe union
A fibre sealing washer used at oil pipe unions, fitted at oil tank and related joint fittings.
This is a fibre washer used at an oil pipe union, part number 29-7971. It's a small sealing washer that sits where an oil line joins its fitting, keeping the joint from seeping under engine pressure. The catalog places it in the oil tank and sidecover area, and it also turns up listed alongside silencer figures in the same books, which tells you it's a general-purpose sealing washer used at more than one union point on the bike.
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Our catalog entries for this one run 1969 to 1970, and it shows up across four separate listings, which is typical for a small fibre washer that gets reused at different joints in the oiling and exhaust hardware. It's cheap insurance in the sense that a tired, hardened fibre washer is a common source of a slow oil weep at a union fitting, so if you're chasing a leak at a pipe joint this is worth checking.
We don't have more detail tying this specific washer to one exact model in our records, so if you're matching it against a parts book for a particular machine, give us a call and we'll confirm before you order.
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