Buying 2002 GTX DI - White Smoke

[mikidymac]

I think that check valve has something to do with the air compressor for the fuel injection but don't remember exactly.

 

[val-e-vue]

I think that check valve has something to do with the air compressor for the fuel injection but don't remember exactly.

After posting this morning, started doing some searching on other posts. I found a good one by @etemplet and another member. He had just had his engine out for rebuild and had a chance to study all the routings. My take-away from that was the following:
Oil Pump has three outputs. Two of them go to the crankcase, one for each cylinder. The third line goes to the compressor to provide lubrication.

The oil tank filler neck has two ports on the side. One goes to the PTO throttle body and the second goes to the bottom of the compressor (oil return). If the check valve was in place, nothing broken, it seems the oil would return from the compressor and would dribble on top of the ring and have to flow through the check valve to get back in the tank. If it built up at all it would reach the hose that goes to the PTO throttle body.

I had assumed that the throttle body was helping remove fumes from the oil tank, but I'm starting to think it's not that simple. Since my filler neck has the broken ring, it's hard for me to tell if it's liquid tight, but I think it would be. If it is, the oil from the compressor has to go through the check valve to return to the tank. If it builds up above the ring that the check valve is mounted to it would get sucked toward the PTO throttle body. It seems to me that the PTO cylinder would get a little extra lubrication by design.

For me this is just interesting theory, it's not like I won't proceed. I will definitely replace the filler neck because I hate broken parts I plan on bench testing the system before reinstalling so that will give me a chance to test the behavior of the new filler neck with the check valve installed. I will simply connect the compressor oil supply directly to the filler neck in place of the compressor return. Then I can watch for build up.

 

[XPLORx4]

Here's more info about the check valve. I'm not certain that these threads provide any further conclusive evidence that the valve is required or not. It seems like there's a greater risk that the valve breaks off, falls into the tank, and plugs the oil outlet on the bottom of the reservoir.

https://www.seadooforum.com/threads/oil-filler-neck-vent-lines-and-check-valve-on-rx-di.103551/
https://www.seadooforum.com/threads...nk-filler-nozzle-and-drops-in-oil-tank.98791/
https://www.seadooforum.com/threads/2003-rxdi-oil-filler-neck-issues.88346/

 

[mikidymac]

Seadoo engineers put it there for a reason. If it wasn’t needed they wouldn’t have bothered.

 

[val-e-vue]

I appreciate your research @XPLORx4 !! This is very good information. I had not considered flipping the ski or riding in rough conditions where the oil would be splashing around in the tank. Both of these cases would make it important to have an intact separator ring. This really completed the picture for me. This is a great forum, much appreciated.

 

[val-e-vue]

I finally got a filler neck that was not broken. I reinforced it with some plastic welding prior to installation because you could see that it was headed toward trouble. It seems the flat ring that mates with the outer neck separates from the tube (inner neck) and that results in the flat ring breaking.

I ran the machine in the yard on the hose and I would get a lot of smoke when I cracked the throttle. At an idle, not so much. I surmised that with the old oil pump, which was stuck at full throttle, a fair amount of oil had built up in the base. I hate to rev an engine with no load so I took it out on the water. It quickly cleared up and stopped smoking.

After going a couple miles on Boca Ciega, I started getting "12V low" warnings along with the beeper so I headed back to the marina. Once I got home I connected the multi meter and found the battery was not being charged. The battery was around 12V at rest and dropped to 11.5 after starting and stayed there. No charging... Rookie mistake, I should have checked this before going out.

Is it safe to assume that the rectifier should be replaced? Ski came with a new battery. I see that OSD has a replacement.

 

[mikidymac]

To verify rev the engine up to about 4,500 rpm and check battery voltage. Should be up about 13.5V. They really don’t put out much voltage at idle.