Gearbox Breathers, who's got one
- Thread starter auldblue
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Yep mine is sealed and when I installed my dearly loved hydraulic clutch. I put a grommet over the pipe going into the cover, just under the hex head so it is sandwiched between it and the cover to keep moisture out too.. Some day I may machine the cover to take a real seal or O ring.
I had a problem with a gearbox made up of spare parts that had neither a breather or hole in the inspection plate. It performed ok for a while with a screw missing from the inspection plate, but once a replacement was found and refitted it pumped all its oil into the primary when hot. Took a while to realise it had a mk3 inspection cap and drilling a small hole fixed the issue!
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needing said:
Even a garden hose or a rain with a bit or wind will put a few drops of water in there. That is all you need to cause the rust that is commonly seen on the shift levers and springs. Auldblue's fitting with a piece of hose pointing down is a much better idea. Jim
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jaydee75 said:
My Dec 73 850 has that also (but no hose, I will fit one (now)
The 71 with no tube type vent had corrosion on the usual plate and dome head bolts.
Auldblue, if you put the vent at the bottom the rain won't get in.
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All gearboxes and diffs have breathers, and always should. My 850 has a breather fitted just like the one shown except it is screwed in. Probably a good idea to fit a hose to it so long as the end of the hose cant suck in water [ I haven't yet had to and that bike has been ridden through some of the worse rain storms you could imagine ]. point the end of the hose down some where.
Dereck
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needing said:Hi all.
Please note the use of words like Major or Minor / Minimal.
If water does get in from riding in the rain or wetting the bike with a garden hose it should sit 'under' the oil i.e. oil still floats on water.
Just a thought: in a number of bikes I have observed, the standard cap vent hole may tend to plug with polish residue which resolves the ingress problem but will 'blow' out should the internal pressure rise sufficiently due to heat. :idea:
It sits in the bottom until the oil gets hot enough to evaporate it. Then it condenses on the linkage under the cover and makes rust. Common on many Commandos. Jim
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