98 GTS 720 Leak From Oil Pump Gasket?

[Seadoo Tuner]

Seadoo is a 98 GTS with the 720, leaked all its oil over fall/winter into the bottom of hull. Not the oil tank grommets or lines, engine is hoisted out and filled with oil to find leak and its coming from the allen key head bolt on bottom of oil pump. Bleeder screw above not leaking. Is there an O-ring or gasket for the oil pump when you remove the 4 bolts?

 

[etemplet]

You're not going to be able to remove the oil pump unnless you pull the rotary valve cover. You shouldn't be getting a lot of oil right there.

 

[Legacy37]

Mine did the exact same thing, turned out the engine was full of oil from bad rotary valve and crank seals. Sorry.

 

[etemplet]

I own a 787 that has a leak on the inner crank seals. My first Seadoo engine I did and saved money by buying a used crank. Not sure if itis the crank or that I didn't use sealant on the outside of the inner seals (I do that now everytime) . LOL Ski runs great otherwise. I just installed a valve on the oil line VIOLA.... works great and I don't need to fog this one. LOL Good Luck !!

 

[mikidymac]

That is your intake manifold leaking oil. Yes, there is an o-ring but as others said it is probably leaking inner crank seals or rotary shaft seal that is causing the excessive oil.

 

[Seadoo Tuner]

So if the rotary valve cover has to be pulled to remove the intake manifold will the rotary valve need to be re-timed or will it stay in place with just the cover removed?

 

[AKnarrowback]

Gently remove the cover and give it a slight twist as you do. If the valve is sticking to the cover giving it a slight twist will break the oil surface holding the two together since the valve will still be locked into the rv shaft splines. Break the tension then slide a pick tip between the two, push the valve towards the motor and pull the plate off. It's easier than it sounds. As long as that rotary disk stays on the splines you won't have to retime anything.

 

[mikidymac]

The intake manifold is a separate piece than the rotary cover and uses a separate o-ring so you don't need to worry about the rotary valve.

 

[KyleW2]

I fought the same battle 2 seasons ago.
Mine ended up being that gasket (part #6 in above picture). Replaced that and no more leak. I had read that it was generally caused by other issues but that wasn’t the case for mine as far as I can tell.