| Diagram | Fig. 6 — CYLINDER BLOCK AND HEAD, T100C SINGLE CARBURETOR · ref 18 |
| Subsystem | engine top |
| Listed in parts books | 1969–1974 |
Split cotter
Split cotter that locks the valve spring cap onto the valve stem in the cylinder head.
This is the split cotter that seats in the top of a valve stem to retain the spring cap and hold the whole valve assembly together under spring pressure. It shows up in the cylinder head figures across a wide run of catalog listings, from single and twin carb top ends through several head variants, which tells you it is a common small part used wherever a valve spring cap needs locking in place.
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Our records show this number, 99-0062, was later superseded by 71-3748, so if your parts book or an older stack of cores turns up either number, they are the same physical piece under two different factory identities.
It is a small item but not one to guess on. If you are rebuilding a head, check your engine's actual valve gear against the figure your parts book shows before ordering, and grab a spare or two while you are in there since these tend to get lost or damaged during valve spring compression.
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