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Mar 29, 2017 - 9:44AM

Re: Valve chest cover/ crank case venting

Thanks Nick,
You may well be right. Have now done four miles on the new engine but am loathed to disturb the valve chest cover to have a look.

Location: Oakley , hants

Mar 29th, 2017 - 9:44 AM

Jim Holyoake

Mar 29, 2017 - 11:21AM

Re: Valve chest cover/ crank case venting

I strongly suspect that oil mist will not get into the valve chest if there are no ventilation holes on the cover. If there is no outlet then the valve chest will just be at the same pressure as the crankcase so there will be no incentive for it to flow into the valves.
The same thing happens I believe with the rear main bearing on 1-1/8" cranks. There is no outlet on the gearbox side of the bearing so no incentive for oil to find its way through the bearing.
The inside of a splash lubricated engine must be a very oily place indeed. The oil from the jets hitting the fast moving crank will create a great deal of oil mist. The main reason why the engines leak oil at the slightest excuse.

Mar 29th, 2017 - 11:21 AM

Nick

Mar 29, 2017 - 1:08PM

Re: Valve chest cover/ crank case venting

Derek Sheldon

Thanks Nick,
You may well be right. Have now done four miles on the new engine but am loathed to disturb the valve chest cover to have a look.

I'm pretty sure that's what cotton buds were invented for.