| Diagram | Fig. 10 — Inner and Outer Chaincase, Hydraulic Tensioner · ref 4 |
| Subsystem | primary |
| Listed in parts books | 1975 |
Norton Plug, Welch or Sealing
A Welch/sealing plug for the chaincase area, PN 06-4727, listed against a 1975 appearance.
This is a Welch plug, also called a sealing plug, that shows up in the chaincase area on the parts diagram covering the inner and outer chaincase along with the hydraulic tensioner. It is a small disc-type plug pressed into a machined hole to seal off an opening in the casting - the kind of thing you find on chaincases and other cast housings where a manufacturing or access hole needs closing off for good.
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Our catalog record only shows this one appearing once, tied to 1975, so we don't have a lot of history on it beyond that single listing. It is a Norton part per our records, not a Triumph piece, so don't try to fit it to a Triumph chaincase.
If you're chasing an oil leak or doing a chaincase rebuild and think this is your part, give us a call and we'll confirm it matches what's on your bike before you order.
Sorry if we got something wrong here. If you think this information isn't correct, .