| Diagram | Fig. 20 — Oil Tank and Fittings, Oils, Lines, Cartridge Filter · ref 32 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton Pipe, Breather (Separator to Tank)
Breather pipe running from the oil separator to the oil tank on the Norton, part of the crankcase venting setup.
This is the breather pipe that runs from the oil separator to the oil tank on the Norton, listed in the catalog under Oil Tank and Fittings, Oils, Lines, Cartridge Filter. It's part of the crankcase breathing arrangement, carrying blow-by vapor away from the engine and back to the tank rather than venting it to atmosphere or letting it pool up as pressure in the crankcase.
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Our catalog record shows this one appearing for the 1975 model year only, with one entry on file. The grounding data we have ties it to Mk2A and MkIII variants, but beyond that we don't have more detail on exact fitment.
If you're replacing this line, check the condition of the fittings at both ends - the separator and the tank spigot - since a perished or cracked breather pipe here is a common source of oil misting or a wet-looking engine bay that isn't really a leak from anywhere else.
Sorry if we got something wrong here. If you think this information isn't correct, .