| Also known as | E6523 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 33 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1974, 1976–1980, 1983, 1985 |
Exhaust camshaft nut
Left-hand-thread nut that secures the exhaust camshaft pinion onto the camshaft.
The 70-6523 is the exhaust camshaft nut, the piece that holds the camshaft pinion onto the exhaust camshaft on the unit-construction engines. It's a small part but it does an important job keeping that gear locked down where it drives the timing gear train off the crank.
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Older parts books list this same nut as E6523, so if you're working from a pre-decimal catalog and see that number, it's the same physical part. Our records show it turning up across engine appearances from 1970 into the late '70s.
This nut carries a left-hand thread, so it's cut and installed backwards from what most people expect on a standard fastener. Worth keeping that in mind when you're pulling the camshaft assembly apart or reassembling it — don't force it the wrong way thinking it's stuck.
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