| Also known as | 68-634 |
| Diagram | Fig. 4 — CRANKSHAFT · ref 5 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
BSA Shim (·005") — crankshaft bearing, left
A .005 inch shim used at the left crankshaft bearing to set running clearance during engine rebuilds.
This is a .005 inch shim used at the crankshaft bearing on the left side of the engine. It's a thin spacer that goes in behind or alongside the bearing to set the correct running clearance and end position of the crank in the cases.
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It shows up in the crankshaft assembly section of the parts books, listed alongside the pistons in the same figure grouping, which is where you'd expect a bearing shim to live. The catalog carries it across appearances from 1969 to 1972, also listed under the alternate form 68-634.
Shims like this one are usually stocked and fitted in sets to dial in the clearance during a rebuild, so if you're doing bottom-end work it's worth having a selection of thicknesses on hand rather than just the one.
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