| Also known as | 40-157 |
| Diagram | Fig. 2 — CYLINDER AND CRANKSHAFT · ref 5 |
| Subsystem | engine top |
| Listed in parts books | 1969–1972 |
BSA Thrust washer, rocker spindle (3/8" I/D)
A 3/8 inch I/D thrust washer that locates the rocker arm on its spindle in the cylinder head.
This is a thrust washer that sits on the rocker spindle up in the cylinder head, with a 3/8 inch inside diameter to match the spindle it rides on. It's a small part but it does real work, keeping the rocker arm located side to side on its spindle so it doesn't wander and rub where it shouldn't.
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You'll find it referenced in the cylinder head and rocker figures in the parts books, and it shows up across catalog listings from 1969 through 1972. The older alias form, 40-157, is the same part under the pre-dash numbering some earlier books used.
If you're doing a top end rebuild and pulling the rocker spindles out, it's worth checking this washer for wear along with the spindle and rocker bushes. Give the shop a call if you're not sure which rocker assembly on your engine takes this one.
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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