Crankcase breather
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Crankcase breather
I've done a search, with no results.
Where is the breather located on the model 20 engine?
I have a feeling mine os either blocked, or not working.
Where is the breather located on the model 20 engine?
I have a feeling mine os either blocked, or not working.
Last edited by sunalp2 on Mon Sep 24, 2018 11:26 am, edited 1 time in total.
- petert120r
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- Location: POWYS UK
Re: Crankcase breather
It's a flap valve inside the large nut securing the primary sprocket to the crankshaft
Re: Crankcase breather
On the earlier twin (1950) like yours it would be a timed breather driven by the inlet camshaft. You should be able to see the rubber tube from it behind the barrel at the back of the chaincase. See page 18 of your 1950 owners manual. You may also have the flapvalve on the end of the crank if the crank has been replaced with a later one.
http://archives.jampot.dk/book/Owners_m ... Manual.pdf
Dave.
http://archives.jampot.dk/book/Owners_m ... Manual.pdf
Dave.
Re: Crankcase breather
dave16mct wrote:On the earlier twin (1950) like yours it would be a timed breather driven by the inlet camshaft. You should be able to see the rubber tube from it behind the barrel at the back of the chaincase. See page 18 of your 1950 owners manual. You may also have the flapvalve on the end of the crank if the crank has been replaced with a later one.
http://archives.jampot.dk/book/Owners_m ... Manual.pdf
Dave.
Sorry Dave, my signature is a bit misleading. My 1950 18s frame has a 1954 Model 20 motor and gearbox.
The reason I'm asking this question is that I've recently done the oil seal mod to stop oil going into the probary tank, and all of a sudden the engine is blowing smoke.
- ajscomboman
- Member
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- Posts: 2343
- Joined: Mon Jan 01, 1990 12:00 am
- Location: HAMPSHIRE UK
Re: Crankcase breather
Breather on the crankshaft bolt is the first place to look. It is possible the spring loaded flap has jammed as they are flimsy little buggers! Good news is at least they are serviceable and the parts available.
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