| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 14 |
| Subsystem | engine bottom |
| Listed in parts books | 1974, 1976–1980, 1985 |
Taper compression ring
A taper compression piston ring for Triumph engines, part of the crankshaft and connecting rod assembly.
71-3690 is a taper compression ring for the crankshaft and connecting rod assembly on Triumph engines, listed in the parts book under the CRANKSHAFT AND CONNECTING RODS and CRANKSHAFT, CAMSHAFTS AND CONNECTING RODS figures. This is a piston ring, part of the ring set that seals the combustion chamber and keeps compression up and oil consumption down.
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The alias GRANT on this part points to a common aftermarket ring supplier, so you may see this number cross-referenced under that name in some supply chains. Catalog appearances for this part run from 1974 to 1985, which lines up with the later unit-construction 750 twins in Triumph's lineup, though you'll want to confirm against your own engine specs before ordering since bore size and oversize needs vary.
Rings like this one are typically sold as part of a full ring set rather than individually, so check what you need for a complete rebuild rather than ordering just the one ring. If you're not sure what size or oversize your bore calls for, give us a call before you order.
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