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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3866
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have 2003 225 4 stoke yamaha has water in oil ,cyl,1 has

Customer Question

i have 2003 225 4 stoke yamaha has water in oil ,cyl,1 has 155,2 has 140,3 150,4 150,5 155, 6 has 89 compression.possible causes
Submitted: 2 years ago.
Category: Boat
Expert:  Charles replied 2 years ago.
Hello, this is Charles, thank you for requesting me today.Well, was there any aluminum of the number 6 plug?Do you know the maintenance history of the engine?
Customer: replied 2 years ago.
Did not see any . No history was acquired in trade .it runs
Expert:  Charles replied 2 years ago.
I cant imagine that it will run well or for very long. With compression that low, it could be the rings, or the valves. Do you have access to the tools to do a leakdown test?
Customer: replied 2 years ago.
No I don't. Was trying to figure if new power head was the way to go.
Expert:  Charles replied 2 years ago.
I would remove the cylinder head and inspect everything before ordering a powerhead. You may only need a valve job to replace a bent valve. Tearing things apart your self is sort of free and fun at the same time. If you get the head off and see that the cylinder walls are really scored, then you will need the powerhead.
Customer: replied 2 years ago.
Would this account for the water in oil
Expert:  Charles replied 2 years ago.
A failed head gasket would. That would also account for low compression. Still have to remove the head to inspect that.
Customer: replied 2 years ago.
Ok thank you
Expert:  Charles replied 2 years ago.
Your welcome. Let me know what you find. Charles
Customer: replied 2 years ago.
I will
Expert:  Charles replied 2 years ago.
sounds good

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