| Also known as | E4058 |
| Diagram | Fig. 1 — CRANKSHAFT, PISTON AND TIMING GEARS · ref 38 |
| Subsystem | engine bottom |
| Listed in parts books | 1963–1964 |
Tab washer
A tab washer used in the crankshaft and timing gear assembly to lock a retaining nut in place.
70-4058 is a tab washer that shows up in the crankshaft, piston, and timing gears section of the parts book. It carries the older E4058 number in catalogs from the early '60s. This is a lock washer with a bent-over tab, the kind of part used to keep a nut from backing off once it's torqued down.
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On a crankshaft and timing gear assembly, a tab washer like this sits under a retaining nut and gets folded against a flat or a lug once the nut is tight, so vibration and running clearance can't work the nut loose over time. It's a small part but an important one to replace whenever it's been bent over once already - a used tab washer that's been folded and straightened rarely locks as well the second time.
We don't have more detail on this one beyond its place in the crankshaft/timing gear figure. If you're chasing a specific nut or rotor fitment on your engine, call the shop and we'll confirm before you order.
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