| Also known as | E9493 |
| Diagram | Fig. 2 — CRANKCASE · ref 28 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970, 1974 |
T100 MAIN ROLLER BEARING DRIVE SIDE - 1969-74- MADE IN JAPAN
Drive-side main roller bearing for T100-family Triumph unit twins, crankcase-mounted, supports the crankshaft's drive-side journal.
This is the drive-side main roller bearing for the T100 family of Triumph unit twins, part number 70-9493, also cataloged as E9493. It sits in the crankcase and carries the drive-side main journal of the crankshaft, letting the crank spin true inside the case without picking up slop or excess play.
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The crankcase figure is where this one lives in the parts books, and it shows up in catalog listings running 1969-74. It's a roller bearing rather than a plain bush, so it's doing real work keeping the crank located and running quiet under load.
A tired bearing here is usually behind extra rattle or vibration from the bottom end, so if you're already into the cases for another reason it's worth a look. Made in Japan, and worth confirming your crankcase and crank match up before you order, since these are matched to a specific bearing spec.
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