Milky oil in jet pump cone

[hellz_wings]

1998 speedster with twin 787’s here.. upon changin oil out of jet pump, oil was milky and some of it seemed clumpy even. Boat sitting since 2015, drove it a few times in 2018 and 2019.. and sitting since 2019 august about. I brake cleaned the cone and got that clean, but can I shoot brake cleaner into the pump where the rest of the oil is slowly draining out? Or maybe degreaser is better? Any suggestions here? Thanks!

 

[rusty nail]

It would be better if you take off the impeller to clean. Degreaser then compressed air.

 

[hellz_wings]

If i take off impeller, do i have to remove the entire assembly with wear ring etc. And re align the motor upon reinstallation? I dont have the alignment tool thats why.

 

[rusty nail]

There are videos on you tube how to remove the pump. Would be good to take all apart to inspect them and regrease the splines on the end of the driveshaft that goes into the pump upon reassembly. No you will not have to realign engine if it is already in the right spot.

 

[rusty nail]

You will need a special tool and maybe heat to pull apart the impeller from the pump. There are videos on that as well

 

[rusty nail]

The oil in the impeller housing is white because water got in there. When you reassemble make sure you replace the o ring on the cone

 

[rusty nail]

And there are seals inside the housing on the other side needing replacement.

 

[hellz_wings]

Hey, the impeller looks good (the blades) and there is no corosion on it or the shaft from what i can see. Since this is a jetboat, is it the same procedure as let’s say a gtx/gts jetski? I’ve seen a few good vids but most already have it off the boat and don’t show installation on the boat.

 

[hellz_wings]

Also which seals on the housing need replacement? I thought only the housing itself? Or are you refering to those two round seals on the top?

 

[rusty nail]

go to this website and view the exploded view of the pump. you will see are the parts and the part numbers needed.

Rivamotorsports.com's Sea Doo Jet Boat Parts Finder

 

[hellz_wings]

I checked and don't see the neoprene seal for my year of boat.. is the parts pic missing the seal for some reason or do these jetboats not have them?

 

[hellz_wings]

sooo i reserached and it looks like the plastic housing jet pumps do NOT have the neoprene seal. I'll double check in the repair manual, I'm guessing they call for some loctite gasket maker around it, and i guess it couldn't hurt to put that there.

 

[POPPS]

You will have either a "neoprene seal," that goes against the inside hull,(clean the old one off), or the ribbed rubber seal that fits around the pump.

 

[hellz_wings]

Checked the manual and it calls for a product called “Right Stuff”, so i’ll likely go with that. I got the impellers off and looked at the impeller shafts. Not sure if theyre still good or not.. either way im changing the thrust washers, thrust bearing, bearings, seals, etc. And wear ring on one jet pump housing (one is still close to like new, the other is mangled). Can someone please let me know if these impeller shafts look good or need replacing (here is one):

 

[hellz_wings]

And here is the other:

 

[hellz_wings]

Im concerned about the grooves near around where the seal is. Is this groove normal or due to wear and does it require replacement?

thanks!!

 

[POPPS]

I have seen super light grooves,,,couple thou that were fine with new seals,,,yours are not normal,,,you need a new shaft,,,there are companies out there, we have some here in canada that re refurbish scored drive shafts,,so keep the old one,,,maybe there is someone your way who can restore it?,,and you'll have a backup.

 

[hellz_wings]

Im in Montreal, i’ll check around, but most places tell me my boat is too old and they only work on newer 4 stroke motors. Ive seen this shaft on sbt’s website, but im worried they’ll send me the wrong one for my speedster. Are all the shafts the same for all years?

 

[POPPS]

That shaft is a common part,,,it is the same for all models,,,should be very available on line,,,or the dealer..

 

[hellz_wings]

Crap was hoping that i didn’t need to replace em. Oh well. No choice. Could vibrations from bad bearings cause this? Or theyre just old and need to be replaced?

 

[lithium2g]

those grooves on the impeller shaft look bad and does it look a bit bent ??
you will need a new impeller shaft they aren't very expensive.

in my limited experiences water can get into the cone from the grub screw and also where it makes contact against the pump. i tried every sealant under the sun to try and prevent thisin but wasnt until i bought a new cone did it get fixed. they are also cheap.

if the wear ring is dogshit get a new one of those too.

just use the parts finder tool that most retailers have rivaracing or bayareapowersports (i've used both of these to australia) and search your seadoo model. it will point you in the direction of what part # you need.

learn from my lessons, dont blow your pump!

 

[hellz_wings]

ya i'm assuming that's partly where the water came in. I'm following the manual when re-assembling so putting the right gasket sealer (518 loctite permatex equivalent) and also pipe sealant on the oil fill plug. I bought some things locally (washers+impeller seal on driveshaft side) and the rest from OSD Marine.. New wear rings, seals, bearings, gaskets, impeller shafts, etc. The impeller shafts don't look bent, but the ends are rusty and pitted, and where the double lip oil seal goes, the shaft is grooved pretty good, so prob not sealing the oil in there as it should. I'm not changing the impellers because they look decent and the housings look decent too (got wear ring off and where it rides is perfectly smooth). The only thing with the housing is that some vanes have the plastic chipped off, not alot, and not all, but like one vane per pump has a good 1/4" chunk off lol. Not sure if this will cause any issues? Hopefully not. I am in the process of removing the driveshafts to check that they are straight (might as well while I'm in there) and also to clean off the surface rust on the splines, and also to check PTO splines and make sure they're good, re-grease splines and orings etc.. All in all, the deeper I go the more probs I find so I'm hoping the driveshafts are good and not bent. In the meantime while I'm waiting for pump parts I'll go ahead and tackle the carbs haha.

 

[hellz_wings]

Well finally got the driveshaft off , looks straight to me and with no grooves. All splines look in tact. Finally some good news! The only funny part is that when removing the shaft, i noticed there was no rubber bumper plug at the PTO end. I wonder if this may have caused the shaft to spin unevenly and maybe mess some things up? I felt inside the PTO boot and did not feel any rubber plug in there (i thought maybe it had fallen off in there?). There was more noise on this engine compared to the other engine and after making all these discoveries I can now see why. I’m gonna hit the surface rust with a wire brush on a dremel and go slow and careful so as not to gouge anything, then grease up splines and orings etc and re-install.

 

[hellz_wings]

Ya so turns out the driveshaft was crooked all along. Ugh. I ordered an aftermarket one from OSD and should be getting it next week, along with wear rings, impeller shafts, etc.

 

[beatnik]

Inspected have a milky oil, I'm like a week away from going for vacation, do you guys recommend taking it apart?, or I just change oil/pressure test?. How much time I need for two pumps overhaul?.