| Also known as | E3690 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 14 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1966 |
Taper compression ring
A taper-faced compression ring for Triumph engines, listed under both 70-3690 and the older E3690 part number.
This is a taper compression ring listed under Triumph's crankshaft and connecting rods figure, and it shows up in the parts books under the legacy number E3690 as well as the current 70-3690. Compression rings of this type seal the piston against the cylinder wall to keep combustion pressure up top where it belongs and out of the crankcase.
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Our catalog record ties this one to appearances spanning 1964 through 1966, but we don't have enough detail here to pin it to a specific model or engine size, so check it against your piston and bore before ordering.
If you're rebuilding a top end from this era, it's worth pulling your old rings and comparing profiles before assuming this is a straight swap - ring sets can vary by bore and by year even within the same general engine family.
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