| Also known as | AA92, E3809 |
| Diagram | Fig. 6 — CYLINDER BLOCK AND HEAD · ref 34 |
| Subsystem | engine top |
| Listed in parts books | 1964–1970, 1974 |
ROCKER FEED BOLT T100 UNIT
Rocker oil feed line bolt for Triumph 350/500 unit twins, part number 70-3809.
This is the rocker feed bolt used on the 350/500 unit-construction twins, the fastener that secures the rocker oil feed line where it connects at the cylinder head. It's a small part but it does an important job, keeping oil moving up to the rocker gear so the top end stays lubricated. Leaky or stripped feed bolts here are a common cause of an oil-starved rocker box, so it's worth checking this fastener whenever the head is off.
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The part shows up across a long run of cylinder block and head figures spanning the 3TA, 5TA, T90, and the various T100 variants (T100S, T100C, T100R, T100T, T100SS) with both single and twin carburetor heads. Old parts books may list it under the AA92 or E3809 numbers, which are the same physical bolt under earlier catalog forms.
Given how many head configurations this bolt appears in, it's a good idea to have your parts book open and confirm which feed bolt your particular head calls for before ordering.
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