| Also known as | E656 |
| Diagram | Fig. 1 — CRANKSHAFT, PISTON AND TIMING GEARS · ref 12 |
| Subsystem | engine bottom |
| Listed in parts books | 1963–1964 |
Compression ring
A compression ring (Triumph PN 70-0656, formerly E656) for the piston, shown in the crankshaft and piston timing gears section of the parts book.
This is the compression ring listed under Triumph part number 70-0656, also known by its older factory code E656. It shows up in the parts-book section covering the crankshaft, piston, and timing gears, so it's a piston ring rather than anything to do with the gearbox or valve train.
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A compression ring's job is straightforward: it seals the combustion chamber above the piston so pressure stays where it belongs instead of leaking past into the crankcase. Wear here shows up as lost power, harder starting, and blue-tinged smoke or oil consumption creeping in over time.
Our records tie this one to catalog appearances from 1963 to 1964, but we don't have enough here to pin it to one specific model. Give us a call with your engine details and we'll confirm it's the right ring 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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