| Also known as | E3857 |
| Diagram | Fig. 6 — CYLINDER BLOCK AND HEAD · ref 31 |
| Subsystem | engine top |
| Listed in parts books | 1964–1970, 1974 |
WASHER ROCKER BOX T100
Rocker box washer for the T100 family, used at the cylinder head/rocker box mounting area.
This is the rocker box washer listed for the T100 family in the cylinder block and head sections of the parts books, part number 70-3857, which shows up under the older E3857 designation in earlier catalogs. It's a small washer that sits under a fastener on the cylinder head area where the rocker box mounts, based on where it appears across the cylinder block and head figures for the 3TA, T90, and T100 variants.
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The catalog entries span several years and cover a handful of related models, so this washer wasn't unique to just one bike in the lineup. If you're pulling the head or rocker box apart for a rebuild, it's the kind of small hardware worth having a few extras of on the bench since they're easy to lose track of or drop into the engine bay.
We don't have detailed spec info on this one beyond its catalog placement, so if you need exact confirmation of size or fit for your particular head, give us a call before you order.
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