| Also known as | E4148 |
| Diagram | Fig. 11 — CHAINCASE AND CHAINS · ref 11 |
| Subsystem | primary |
| Listed in parts books | 1964–1965, 1968–1970, 1974 |
TRUNION PRIMARY TENSIONER
Trunion for the primary chain tensioner, pivots the tensioner blade inside the chaincase.
The 70-4148 trunion is part of the primary chain tensioner setup, living inside the chaincase where it works with the adjuster to take slack out of the primary chain. This part has shown up in the parts books under the earlier E4148 form as well, so if you're cross-checking against an older book don't be surprised to see it listed that way.
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It's a small piece but it does real work, letting the tensioner blade pivot and seat properly as it bears against the chain. Catalog listings for this trunion span a wide stretch of years, so it's been a long-running fitment across the primary chain tensioner design.
If you're doing chaincase work and pulling the tensioner assembly, it's worth having a look at this trunion for wear since it's a small, easy piece to overlook while you're focused on the blade and chain.
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