| Diagram | Fig. 11 — ENGINE FITTINGS AND EXHAUST SYSTEM · ref 13 |
| Listed in parts books | Not catalogued by year yet |
EX CAM NUT/P.U.TACH DRIVE
Exhaust cam nut for the pre-unit tachometer drive setup, left-hand thread with a slotted head.
This is the nut that secures onto the exhaust camshaft where the tachometer drive picks up its rotation. The catalog description ties it directly to the exhaust cam and the tach drive setup, so it's a small but specific fastener rather than a generic nut off the shelf.
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Other catalogs list this same part number with a note that it's a left-hand thread and has a slotted head, which lines up with what you'd expect on a rotating cam-end fastener that needs to stay put under running vibration.
We don't have much more detail on this one beyond that. If you're replacing it, match up the thread and slot profile against what comes off your cam before you order, and call the shop if anything looks off.
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