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Jeremy R.
Jeremy R., MarineTechnician
Category: Boat
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Experience:  Multiple factory certifications 20+ years of experience.
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98 Sea doo GTX fuel injected 787 hydraulic locking one

Customer Question

98 Sea doo GTX fuel injected 787 hydraulic locking one cylinder with oil
Submitted: 1 year ago.
Category: Boat
Expert:  Jeremy R. replied 1 year ago.

Hi, Sorry for the delay in responding.
My name is ***** ***** I'll help you with your question.

Your problem is a bad crank seal.
In the center of the engine is a brass gear that is driven off of the crankshaft. That brass gear drives the shaft that makes the rotary valve rotate and time your intake into the engine.
That gear in the middle of the engine is surrounded by oil to keep it cool and lubricated.

What happens usually is that gear wears and the brass splinters. Those splinters eat the rubber on the crank seals and then the oil runs into one cylinder or the other sometimes both and floods it out.
The big problem is the only way to fix this is to either rebuild the crank or replace it.

Sorry for the bad news. This is one of Seadoos design issues that sets them apart from other companies. Nobody else uses the gear driven intake. And for good reason.

Let me know if there's anything further I can do for you.

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