| Listed in parts books | Not catalogued by year yet |
BIG END SHELL SET,A10.020
Big end bearing shell set, .020 oversize, for a BSA A10 twin crankshaft.
This is a big end shell set listed in our records as 67-0322, described in the parts book as A10 .020 - meaning it's ground .020 over standard size for a rebuilt or reground crankshaft. The description names the A10, which is a BSA model, not a Triumph, so despite how this part number is filed in our system, it belongs on a BSA A10 twin, not a Triumph engine.
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Big end shells are the bearing inserts that sit between the connecting rod and the crank journal, taking the load every time that piston fires. The .020 oversize marking means this set is meant to be fitted after the crank pins have been reground .020 undersize to clean up wear - it is not a standard-size replacement.
We don't have much more on file for this one beyond what's in the description. If you're rebuilding a BSA A10 bottom end, give us a call and we'll confirm this is the right oversize for your reground crank before you order.
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