| Also known as | T3620 |
| Diagram | Fig. 12 — INNER AND OUTER CHAINCASE · ref 19 |
| Subsystem | primary |
| Listed in parts books | 1969 |
"O" ring
An O-ring seal used at the inner and outer primary chaincase joint, catalogued for 1969.
This is an O-ring listed against the inner and outer chaincase on the primary side, catalogued for 1969 under part number 57-3620, with T3620 as the older-style alias for the same piece. An O-ring in this location does the simple job any O-ring does: seals a joint so oil stays where it belongs instead of leaking out at a mating surface between chaincase parts.
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Our record on this one is brief. Beyond the figure title placing it at the inner and outer chaincase, we don't have more detail to add on size or fitment. If you're matching up a primary chaincase rebuild and need to know this one fits your particular case halves, give us a call and we'll confirm before you order.
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