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1996 Seadoo Challenger/ Oil/gasket problem

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jkp0471

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I have oil draining into my crankcase. The dealer said that the crankcase gaskets was gone. The engine will not turn over unless a pull the plugs and blow out the oil. He said I need to replace the engine due to the cost to replase the gaskets.
Can I drain the oil tank and just mix the oil with the gas? Basily by passing the oil tank and oil pump.
 
You could go to a premix setup which would require blocking off the oil pump properly. There are varying opinions about how much of the oil pump parts to abandon or retain (as it is highly integrated to the engine).
 
That's not the problem.

The oil in your gas is not the problem. What the dealer is talking about is your rotary shaft seals. You'll notice on the bottom of your oil tank, there are two lines. One is going to a small oil filter and then on to your injection pump. The other line is going to the port (left) side of your motor, in the center. This is the oil line, supplying your rotary chamber. Then, on the starboard (right), the vent line from that chamber is going to the top of the oil tank.

If you switch to fuel pre-mix, you still have to leave that tank on to lubricate your rotary shaft. This shaft is a worm gear that runs perpendicular to your crankshaft and is what controls the timing of the fuel inlet into the engine.

It's location is in the center of your crank, between the two pistons. There are seals on either side of it to keep the oil in the chamber and out of the crankshaft connecting rod areas. When these seals go bad, the oil will run into the crankcase, hydrolocking your pistons from turning.

The only way to repair it is a crankshaft replacement. You can order a replacement for $275.00, pull the engine and change it out yourself.:cheers:
 
Same problem

I have a 1997 Challenger with the 787 and overnight, out of the blue, the oil reservoir emptied into the crankcase, out the carbs and into the engine compartment. I hope this is not the same problem. It just happened overnight, not after sitting for a long period of time.
 
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