| Also known as | 14 6218 |
| Diagram | Fig. 2 — CRANKCASES · ref 16 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1974 |
BOLT 5/16X18X1 3/8
Crankcase bolt, 5/16-18 UNC x 1 3/8 inch, used in crankcase and timing gear assembly.
This is a 5/16-18 x 1 3/8 bolt used in the crankcase assembly, showing up across the crankcase and timing gear/oil filter figures in the parts books. It's one of the fasteners that holds the crankcase halves and related covers together on the bottom end of the motor.
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The catalog lists it appearing repeatedly from 1969 through 1974, so it's a bolt that stuck around across several seasons of production without a running change. If you're rebuilding a bottom end and need to replace a stripped or rusted bolt, this is the part number to match up against your parts book listing.
Thread callout is 5/16-18 UNC, length 1 3/8 inch. Worth checking your existing bolt against this spec before ordering, since crankcase bolt lengths can vary by location on the case.
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