| Diagram | Fig. 4 — Engine: Crankcases, Crankcase Breather, Tachometer Drive · ref 8 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton Stud, Front, Cylinder
A front cylinder base stud for a Norton engine, part number 06-2639.
This is a cylinder base stud, part number 06-2639, carried in the crankcase and breather section of the engine records. It's a Norton part, not a Triumph piece, so if you're working on a Triumph engine this one isn't for you.
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A stud like this holds the cylinder down onto the crankcase mouth, giving the base nuts something to draw against so the cylinder stays seated under combustion pressure. Front-mounted studs like this one see a particular load path depending on where they sit around the base, which is why the catalog calls this one out specifically as the front stud rather than lumping it in with the others.
Our record on this one is thin - it shows up once in the catalog data we have, tied to 1975. If you're chasing a stud for a rebuild, check the thread and length against what's actually in your case before you order, and give us a call if you want to confirm fitment.
Sorry if we got something wrong here. If you think this information isn't correct, .