1930 Sidevalve - Using a Lot of Oil

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tony.barnett
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1930 Sidevalve - Using a Lot of Oil

Postby tony.barnett » Sat Feb 16, 2013 1:27 pm

I have a 1930 Model B - sidevalve. It goes great, doesn't leak any oil, doesn't appear to smoke but it will consume a pint of oil or more per 100 miles. Clearly this causes some difficulty if you want to go anywhere.

Has anyone had this problem and managed to sort it out?

I've had suggestions such as putting an oil ring in (I assume it has the original two compression ring piston) - would I need to remove the baffles in the crankcase throat if I do this? Or checking the oil pump is returning properly. Or even valve guides but I struggle to see how it can be that for a sidevalve.

Are piston rings for this bike readily available?

Any suggestions or comments welcomed.

Ta.

Tony
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Postby robin.parker » Sat Feb 16, 2013 1:36 pm

Tony, Are you certain it's not smoking? I would get someone to follow me for a few miles to make sure , if it ain't leaking or smoking it's a mystery to me. 100 miles per pint usually equates to more smoke than any two-stroke!--or very full crankcases.
Good luck.
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Postby tony.barnett » Sat Feb 16, 2013 2:07 pm

People have followed me and told me its not smoking. It must be going somewhere and I reckon it must be into the combustion chamber. It certainly likes a drink.
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Postby john.mitchell » Sat Feb 16, 2013 2:26 pm

What oil pump have you got, Tony? I thought I would be clever and put a more efficient 1950s pump in my Model G when I built it. I had exactly the same problem. When I reverted to one of the earlier narrower gauge pumps the problem went away. My piston had no oil ring either.
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Re: 1930 Sidevalve - Using a Lot of Oil

Postby adrie.degraaff » Sat Feb 16, 2013 2:58 pm

Hi Tony,
there is more than one way of solving this.

First check if the barrel is round.

Two small rings in one gap is the easiest, slots oppesit.

Buy new rings, make a clamp to give them an angle in the lathe so they scrape better.

Give it an oilscraperring if there is room for it.

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Postby admin » Sat Feb 16, 2013 8:46 pm

If the oil is going into the combustion chamber, in that quantity, then the plug would get shitty really quick ?

Is it chucking it out of the breather when running ?
My CJ750, when it has too much oil in it, shoves it ALL out of the breather (which routes into the air filter housing and fills that up; so I know it's doing it)
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Postby nevhunter » Sun Feb 17, 2013 1:01 am

If you are burning that much oil it will show smoke and oil the plug and build up a lot of carbon. Take the filterplate off anyhow and see how much oil is down the bottom of the crankcase. There is no seal on the drive side and some could be going out there. Has the engine got good compression? If the rings are not sealing well the crankcase will be pressurised and force oil out of the engine anywhere it can.
As Adrie says you can fit two thin rings in each groove and they work well. Nev

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Postby Dave.Barkshire » Sun Feb 17, 2013 10:32 am

I've had an oil pump which was not scavenging properly so the crank case level increased but this did cause a smoke screen. If the oil is dissappearing then is is either being burnt (in which case you'll have a smokefest) or its escaping onto the road somewhere. If there is no smoke then I wonder if it is escaping from somewhere? Many people do use pistons with an oil ring when they do a rebuild and I'm told that the early skinny pumps are just fine on these motors. You can sometimes improve the oil pumps by tapping the balls into their seats to make them sit better and new springs are good.
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Re: 1930 Sidevalve - Using a Lot of Oil

Postby Wali.Badger.Taylor » Sun Feb 17, 2013 11:17 am

If there is no smoke it is not being lost via the combustion chamber so that means it is coming out either by the drive side bearings or the breather. Make sure that the non-return in the elbow on the breather is not jammed open with crud and the pump is scavenging well.

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Postby huw.parsons » Tue Feb 19, 2013 9:48 pm

get a sidecar to carry your replacement oil in.
you know it makes sense!

H


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