| Also known as | E3711 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 4 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1968 |
Screwed plug
Screwed plug that seals the crankshaft sludge trap, keeping debris out of the oil feed to the connecting rod journals.
This is the screwed plug that seals the sludge trap in the crankshaft, sitting in the crank assembly per the catalog's crankshaft and connecting rods section. The sludge trap is the drilled cavity in the crank that collects debris flung off by centrifugal force as the crank spins, keeping that grit out of the oil feed to the con rod journals. The plug threads into the end of the crank to keep the trap closed up once it's cleaned out.
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This one is listed under 70-3711 with the older E3711 form also on file, and the factory record shows it was later superseded by 70-9492. If your parts book or a prior rebuild references either of those numbers, they point to the same physical plug.
When you're in there for a rebuild, this is the kind of plug worth pulling and cleaning the trap behind it rather than just leaving it be. Confirm which crank you've got before ordering, since crank and sludge trap details can vary across the range this catalog covers.
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