| Also known as | E3794, WW27109 |
| Diagram | Fig. 6 — CYLINDER BLOCK AND HEAD · ref 32 |
| Subsystem | engine top |
| Listed in parts books | 1964–1970, 1974 |
Cylinder head bolt (5 7/16 in. U.H.)
Cylinder head bolt, 5 7/16 in. under-head length, for Triumph unit 350/500 twin cylinder heads.
This is a cylinder head bolt, 5 7/16 in. under-head length, used to secure the cylinder head down onto the barrel on Triumph unit-construction twins. It shows up across a long run of catalog years and appears in the cylinder block and head figures for the 3TA, T90, 5TA, T100, T100S, T100C, T100R, T100SS, and T100T listings, so it's a small twin head bolt rather than something for the 650 or 750 range.
Read more
The legacy part number for this one is E3794, and it's also cross-referenced under WW27109 in some records. Head bolts like this one work in sets, and different positions around the head can call for different lengths, so it's worth checking your existing bolt against this one before ordering rather than assuming every hole takes the same length.
If you're doing a head gasket job or a full teardown on one of these smaller twins, it's a good idea to look over the whole set of head bolts for stretch or thread damage rather than just replacing whichever one broke.
Sorry if we got something wrong here. If you think this information isn't correct, .