| Also known as | T989 |
| Diagram | Fig. 2 — CRANKCASE · ref 9 |
| Subsystem | engine bottom |
| Listed in parts books | 1960–1974, 1976–1980, 1983, 1985 |
DOWEL HOLLOW 1/4 X 5/16
A hollow locating dowel (1/4 x 5/16), 57-0989, used to align crankcase, gearbox, and cover joints on Triumph engines.
This is a small hollow locating dowel, part number 57-0989, listed in the catalog as 1/4 x 5/16. It shows up across a wide range of figures on Triumph engines and gearboxes - crankcases, timing covers, contact breaker and pulse sensor covers, chaincases, and gearbox inner covers - which tells you it does the same basic job in a lot of different spots: keeping two mating castings or covers registered to each other so they line up the same way every time they're bolted together.
Read more
Because it turns up in so many figures across such a long catalog run, this isn't a part tied to one assembly - it's a general-purpose locating dowel used wherever the factory needed a casting or cover to seat precisely. The older book reference for this part is T989.
It's a cheap item to keep a couple of spares of in a parts drawer, since dowels like this have a habit of getting misplaced or damaged during a strip-down. Check your own parts book figure to confirm which specific joint you need it for before ordering.
Sorry if we got something wrong here. If you think this information isn't correct, .