| Also known as | E3691 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 13 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1966 |
Plain compression ring
A plain compression ring for the piston, listed under 70-3691 (also E3691) in the crankshaft and connecting rods section of the parts book.
This is a plain compression ring, listed in the crankshaft and connecting rods section of the parts book under 70-3691, also found in older catalogs as E3691. Compression rings of this type sit in the piston grooves and help seal the combustion chamber against blow-by while the piston travels up and down the bore.
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The catalog entry here doesn't spell out bore size, ring thickness, or which specific engine it was fitted to beyond placing it in the crankshaft and connecting rods figure. If you're matching this up to a rebuild, check your piston and bore size against what you're ordering, and call the shop if you want to confirm fitment before you buy.
We don't have more detail on this one beyond what's in the catalog record. It shows up across a handful of parts-book listings from the mid-1960s, but nothing in our records ties it to a specific model.
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