| Diagram | Fig. 5 — CYLINDER BLOCK AND HEAD TR7RV · ref 45 |
| Subsystem | engine top |
| Listed in parts books | 1974, 1976–1980, 1985 |
SPINDLE,R/BOX-T140 73-89
Rocker spindle for the T140/TR7 750 twin cylinder head, threaded UNF, carries the rocker arms and feeds them oil.
71-3549 is a rocker spindle for the top end of the 750cc unit-construction Triumph twins, the T140 and TR7 family. It sits in the cylinder head and manifold-and-tappets area, carrying the rocker arms and feeding oil up to them, so it's doing double duty as both a pivot shaft and an oil path through the head.
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Our catalog records show this part showing up across cylinder head and manifold figures from 1973 into the later 750 production run. It's threaded for UNF rocker spindle nuts, so when you're sourcing hardware to go with it, make sure you're matching that thread standard.
The rocker spindle wears from years of rocker arm movement and from oilway buildup, so if you're doing head work on a 750 twin from this era, it's worth checking the spindle's condition rather than just reusing whatever's in there.
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