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Have a 40 hp 2 stroke. One cylinder has milky stuff in it.

Have a Johnson 40...

Have a Johnson 40 hp 2 stroke. One cylinder has milky stuff in it. It won't let motor turn over with plugs in it.

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40 HP 2 stoke Johnson one cylinder has a milky substance it won't let the motor even turn over

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Answered in 2 minutes by:
3/21/2018
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,746
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello, my name is***** will assist you.

Is this happening to you on the hose or in the water?

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Customer reply replied 4 months ago
Charles, on both it won't even try to start it pegs compression gauge and and won't turn over but once with plugs out and gauge hooked up. it turns over fine with both cylinders open

With no water in the cylinder, are you able to get a good compression reading?

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Do you also have the full model number for the engine so I can get the diagrams pulled up?

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Customer reply replied 4 months ago
no sir

Do you know the year of the engine?

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Customer reply replied 4 months ago
no maybe 90s
Customer reply replied 4 months ago
I will have to find the title the tag is gone.

Ok, you have 2 areas that will need to be checked that can allow water to enter the cylinder. Those are the head gasket and the exhaust plate. I would lean more toward a blown head gasket.

http://www.boats.net/parts/search/BRP/JOHNSON/1993/J40EETB/CYLINDER%20&%20CRANKCASE/parts.html

Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,746
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Customer reply replied 4 months ago
Ok thank you.

If you go to pull the exhaust plate 16 in the diagram. Be careful on the bolts. They may break on you. Had that happen to several on these older engines.

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