| Also known as | E4579 |
| Diagram | Fig. 2 — CRANKCASE · ref 40 |
| Subsystem | engine bottom |
| Listed in parts books | 1964 |
Blanking plug
A crankcase blanking plug for sealing an unused casting hole, catalog number 70-4579.
This is a blanking plug that lives in the crankcase, catalog number 70-4579, also listed under the earlier E4579 form. A blanking plug's job is simple: it seals off a hole in the casting that isn't used for anything else on this particular engine configuration, so oil stays where it belongs and nothing weeps out.
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Our catalog record only ties this one to the crankcase figure, so beyond that we're not going to guess at exactly which bore or passage it seals. If you're chasing an oil leak or rebuilding a bottom end and need to know precisely where this one threads in, give us a call and we'll walk through it with your parts book or the actual casting in front of you.
It's a small, inexpensive item to keep on hand if you're doing crankcase work, since a stripped or missing plug is an easy way to lose oil pressure or make a mess.
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