1966 6hp johnson

T

texaslefty

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Apr 7, 2008
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my 6hp is flooding bad on top cylinder only the bottom cylinder is dry runs great.i pulled pluges out used a drill for a starter and the top cylinder poured gas out.could it be fuel pump or reeds . coils fire good carb been cleaned two times. another problem is water in gear case i think it the bushing on the main shaft under the water pump is it hard to rreplace. please any help
 
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Xcusme

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Apr 21, 2003
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Re: 1966 6hp johnson

Welcome to iboats!

Easiest way to check fuel pump, remove it's 2 mounting screws, seperate from powerhead, pump primer bulb. If fuel runs out back side of pump, it points to a hole in the pump diaphram. Replace or re-build pump. I'm not sure if your pump is driven from the top cylinder....
I doubt you have a problem with the reeds. Both cylinders are fed from one carb.
I would drop lower unit and run a pressure test on it (8-12 psi). Put lower unit in a bucket of water, you'll see in a flash where the leak is. No that drive seal isn't hard to replace.
BTW, are you sure it's fuel in the top cylinder? Could you have a blown head gasket? Compression test will tell.
 
T

texaslefty

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Apr 7, 2008
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Re: 1966 6hp johnson

i am about 99% sure it gas. could the fuel pump flood one cylinder.the gasket behind the pump looked wet and the return oil hose on the side that goes from top to bottom is cracked will that hurt. thank for your help checking fuel pump first thang in morning
 
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Xcusme

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2,888
Re: 1966 6hp johnson

The fuel pump operates on the pressure/vacuum cycle in the crankcase for one cylinder. The vacuum cycle can pull fuel into the crankcase through the broken fuel pump diaphram.
 
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