| Also known as | E12877 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 27 |
| Subsystem | engine bottom |
| Listed in parts books | 1974, 1976–1980, 1983, 1985 |
NUT,CRANKSHAFT PINION
Crankshaft pinion nut that retains the timing pinion gear on the timing side of the crankshaft, 3/4 in. x 20 TPI.
This is the crankshaft pinion nut, part number 71-2877, also carried under the older number E12877. It sits on the timing side of the crankshaft and holds the timing pinion gear in place. The catalog shows it appearing across crankshaft and camshaft assembly figures, so it's a factory-listed piece rather than an aftermarket substitute.
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The nut is small but it's doing an important job, keeping that pinion seated and running true so the timing gears stay in mesh the way they should. If you're pulling the timing cover for any reason, it's worth having one of these on hand in case the old one shows wear on the threads or the flats.
Our records show this number showing up in catalogs from the mid-1970s through the mid-1980s, so it belongs to the unit-construction twin family that spans those years. Measures 3/4 inch by 20 TPI. Confirm fitment against your own engine before you order.
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