| Diagram | Fig. 2 — CRANKCASES · ref 17 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1974 |
CASE BOLT T150 5/16-18UNC X 3.25 UH (Replaces 21-1850)
Crankcase case bolt for the T150 Trident, 5/16-18 UNC x 3.25 inches, replacing the earlier 21-1850.
This is a crankcase bolt for the Trident triple, listed in the catalog under the CRANKCASE figure. It's a case bolt sized 5/16-18 UNC by 3.25 inches under the head, the kind of fastener that clamps the crankcase halves together and needs to be right for torque and length to keep the joint sealed. The catalog notes this part replaces the earlier 21-1850, so if your parts book or an old bolt in hand is marked with that number, this is the current equivalent.
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Because it only shows up once in our records, tied to the 1974 model year for the T150, we don't have a lot of extra history to add beyond what's on the part itself. If you're rebuilding a case and need to know how many of these go in or which position they take, bring the old bolt or the manual page in and we'll match it up.
Sorry if we got something wrong here. If you think this information isn't correct, .