| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 23 |
| Subsystem | engine bottom |
| Listed in parts books | 1978–1980, 1983, 1985 |
Fan disc lock washer
Lock washer for the alternator rotor nut on the crankshaft, PN 21-7024.
This is the lock washer that sits behind the alternator rotor nut on the crankshaft, part number 21-7024, also listed under 6.7894 in older references. It shows up in the crankshaft and camshaft figures of the parts books, which places it right at the front of the crank where the rotor is secured.
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Its job is to keep that rotor nut from backing off once it's torqued down. It's a small, cheap-to-replace item, but it's the kind of thing you want on hand when you're pulling the rotor for any reason - alternator work, crank seal jobs, or a general bottom end rebuild.
Our catalog record for this one spans appearances from 1978 into the mid-1980s. If you want to confirm it's right for your specific engine, give us a call before you order.
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