| Diagram | Fig. 2 — CRANKCASE · ref 55 |
| Subsystem | engine bottom |
| Listed in parts books | 1979 |
CRANKCASE TS/DS
A 1979 Triumph crankcase casting (TS/DS variant) that houses the crankshaft and main bearings.
71-7021 is a crankcase listed in Triumph's crankcase figure for 1979. The description on file marks it TS/DS, which points to a specific bottom-end casting variant, but our record doesn't spell out further detail on bore, stud pattern, or which model line it was cut for.
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The crankcase is the bottom-end housing that carries the crankshaft, camshafts, and main bearings, and forms the foundation the cylinder block and gearbox bolt to. Because it's a casting tied to a narrow production window, matching it correctly matters more than usual.
We only have one catalog listing for this number and no broader fitment notes beyond the 1979 year tag. Call the shop with your frame and engine numbers and we'll confirm before you order.
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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