93 Seadoo SPX running hot

[rad1026]

at the lake this last weekend the Seadoo was running really hot. I'm sure it is getting good water flow but it doesn't seem to be pulling oil from the oil tank. It seems like the oil pump is going bad. I took it over to my tech last night and he pulled the head and said it looks really good. No water flow restrictions. He recommended just pre-mixing the oil in to the gas which from what I have read here is a good idea. He said he is going to pre-mix some oil and gas and run the ski today to see if it still gets hot. If not, that would increase the probability of the oil pump going out. He says in order to run without the oil tank he has to order a oil pump bypass kit and basically disassemble down to the oil pump in order to install the kit. Pretty much the same cost to either install the bypass or install a new oil pump since he has to tear it down that far anyway. Does this make sense? Thanks for the help!

 

[Rob454]

Re: 93 Seadoo SPX running hot

Pulling the head wont tell you anything as far as why its hot unless you have a bunch of sand in there. Look for a obstruction either at the exhaust or. I woudl check the incoming water supply hose and look for a obstruction there. ( the exhaust pipe has a small 90* fitting right where it turns up. that fitting may have some sand or a rock in it. I woudl also do a compression test which will tell you if you lost compression. the oil losss will show up as scars on the cylinder walls.


All you need to do is take off the carbs and then the rotary valve cover/intake. if you can I try to remove the whole thing as one piece but its a PITA thats why I remove the carbs and lay them off to the side.Remove the oil pump and the plastic gear that drives the oil pump. If youre careful when removing the intake try to not pull the rotary valve when you remove the cover otherwise youll need to retime the rotary valve if you pull it off. I usually leave two bolts in about 1/3 of the way screwed in.and pull the cover away then stick a small thin screwdriver and hold the rotary valve against the cases. it will stick because of the fuel and oil residue. then I jsut take off the last two bolts.
after you remove the oil pump and gear youll need a oil pump block off plate. that bolts into the old oil pump location ( there will be a hole there which you dont want make sure you seal the back of the block off plate with a little silicone). NOW the incoming oil line FROM the oil tank ( right side as sitting on ski) NEEDs to be tied in to the oil line going back to the tank ( Line on the LEFT side of the ski going back to the oil tank). i usually use a t fitting and a piece of a flush kit that has the hose fitting with the cap.
the reason for this is the brass gear that sits between the cilinders inside the cases has a oil bath design which needs to remain. The gear is on a shaft which in turn has a splined end where the rotary valve sits. Thats what drives the rotary valve. the brass gear is turned by the crank shaft. Fill the lines through the T fitting but leave a little room for expansion of the oil.

if you want to change the oil I just disconnect the tee and then blow some compressed air to get the oil out You wont get all of it. then I reconnect the tee and then refill the lines.

The oil block off is about 12-16$ but if you have a machinist friend he can probably make you one. the tee maybe 1$ and the flush couple of bucks.
Rob

 

[Jeff Walkowiak]

Re: 93 Seadoo SPX running hot

is it running hot or is the alarm going off?? if you can put your hand on the engine and it feels warm buy not really hot or if the paint isn't discoloring on the head I can tell you that those engines have really bad heat sensors and they usually just go bad, I bet you can replace the sensor on the head and your alarm will stop going off.

 

[rad1026]

Re: 93 Seadoo SPX running hot

thanks for the replies. Rob, the head was removed just to look for obstructions. None were found. Water seems to be flowing fine out the back holes. The compression is on the low end of the scale, I don't remember what it was. Its an old ski and we are trying to keep it going for this season without spending too much money on it. I think we'll try the oil bypass and see how that goes.

Hey Rob, I grew up in Westminster, off of Trask and Chestnut St. over by Ray Schmitt Elementary School. Lived there till I was 14 then we moved over to Huntington. I still went to Westminster High. That whole place has changed so much.

Jeff, I have not heard the alarm go off, unless it is a squealing sound like something is too hot. The engine gets pretty hot. Too hot to touch, but not hot enough to boil water or peel paint. Do these old things just run that hot? I'm thinking the old girl is just getting tired and its probably time to drop a new engine in there, just hope I can keep it going for a little while. It definitely isn't pumping oil though and I think that's the first thing to address. Thanks again guys.

 

[Rob454]

Re: 93 Seadoo SPX running hot

jet ski motors run hot at WOT if youre just idling it shoudl be pretty cool.
The pee holes in the back are to show you that water is circulating.
Look inside the ski right where the driveshaft is. in the fiberglass area ( transom) youl see two small hoses and one big hose. the big hose is the incoming water hose. Take it off and back flush it from the motor to the pump.
If you ride in sandy water or beach it sometimes sand gets clogged up in the hose and the pump doesnt provide enough pressure to clean the sand out.

Rob