| Also known as | 99-9945, E3706 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 10 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1970, 1974 |
Big end bearing (available in ·010 and ·020 undersizes)
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70-3706 is the big end bearing for the crankshaft/connecting rod assembly, listed in the CRANKSHAFT AND CONNECTING RODS section of the parts books. This is the shell bearing that sits between the connecting rod and the crankpin, taking the load every time the piston fires down the bore. It's sold in .010 and .020 undersizes for regrinding work on a crank that's been machined down from standard.
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Older parts books list this same piece under 99-9945 and E3706, so if you're cross-checking a rebuild kit or an old invoice against a different number, those are the same physical bearing. The catalog shows this part across a run of years from the mid-60s into the mid-70s, so it's worth having your crank in hand or your engine number ready when you order to make sure you get the right undersize.
Big end bearings wear as a set with the crankpin surface, so when you're replacing these check the crank for scoring or out-of-round before bolting things back together. If the crank has already been reground, match the undersize stamped on the pin to what you order here.
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