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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3341
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a 2003 seadoo gtx 4tec supercharged. Ski ran perfect

Customer Question

I have a 2003 seadoo gtx 4tec supercharged. Ski ran perfect at the lake last week. Had it at the house a few day later and i turned on the garden hose before i started the engine. I didnt realize at the time you shouldn't do that. Any how i ended up with a hydro locked motor. Pulled the plugs and cranked it over. Started it up it ran a few seconds and died. I happened to check the oil (which used to be perfectly clean) and it was milky from the garden hose water i assume. I changed the oil, filter and spark plugs. Ski started up, i let run about 30 seconds. Turned garden hose on. And with endine running i pulled dipstick to take a look and oily water shot out like a fountain from the dipstick hole. Any ideas?
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Submitted: 5 months ago.
Category: Boat
Expert:  Charles replied 4 months ago.

Hello, my name is***** will assist you.

The exhaust on the ski is water cooled. when the ski is running, normally there is enough combustion pressure in the exhaust to keep the water out of the cylinders. When you started the water before the ski, you filled the cylinders with water through the exhaust valves. When the engine hydro locked, it could have bent a valve or two and now, there is nothing to stop the water from entering the cylinders. You are going to need to do both a compression test and a leakdown test on the engine. Just to see if the cylinders can make and then hold pressure. If they cannot, you will need to rebuild the upper end of the engine.

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