newbe help!!

[97explorer717]

First of all hi to everyone. I am about at my end. I got a 97 explorer a couple weeks ago. It had been sitting 2 years. Pulled motor, fuel tank, cleaned, all new lines, fresh rotary valve bath oil and premix. Took it out and ran great about 5 mins then started hearing a whooshing sound. Took it home, checked over and ran on hose. Did not hear or see anything. Went back out on the 4th and it started not wanting to plane. Got back and wear ring was chewed up BAD! Tonight I installed new bearings, impeller shaft and wear ring (all from sbt). When I reinstalled the pump it was so tight the motor would not turn over. I then loosened the pump and it fired while shaving some of the new wear ring out. I ended up having to start the ski and slowly tighten the pump. It shaved a uneven grove in the new ring. I have looked inside the pump while its running and it looks to be spinning straight. Any thoughts would greatly be appreciated.

Just a little history, this is my first jet anything or seadoo. I purchased a 95 Explorer and had it 3 months before loosing the bottom end (9yrs old sbt engine). Did the same maintenance as above for the 97.

 

[Waterluvr]

There are 0.9mm shims, Sea Doo PN# 204120067 that need to be used on the studs in back of the impeller housing when you install the pump back on the boat. Feeler gauges will allow you to identify clearance issues from the new wear ring to the impeller blades, the idea being you want the smallest measurement at the blade tips to be close all the way around.

Typically it is the top studs that require the shims, and you shouldn't have an OEM ring being cut into by an OEM impeller if installed correctly.

 

[97explorer717]

There were no shims between the pump and hull. The impeller is OEM, but I used a sbt ring. That sounds like what could be the problem.

 

[LouDoo]

Using shims on the pump is a new one on me. But I have never owned or worked on an explorer, maybe they're different. On Seadoo PWC's and boats you shim the motor not the pump. Does the explorer use a ride plate or does the pump mount directly to the hull?

Lou

 

[97explorer717]

It has a "ride shoe" as the book calls it. The studs are sticking out the back of the hull.

 

[Waterluvr]

Using shims on the pump is a new one on me. But I have never owned or worked on an explorer, maybe they're different. On Seadoo PWC's and boats you shim the motor not the pump. Does the explorer use a ride plate or does the pump mount directly to the hull?

Lou

For clarification the PN# I listed is strictly for the pump housing studs and has a separate function from shims used at the motor mount locations for the motor/shaft/pump bearing alignment. They are simply applying some compression to the mounting ears of the pump to correct slight discrepancies in pressure points of the pump housing to the wear ring that effect clearances.

I owe my local dealer for that tidbit, he shared that with me and being patient and getting both the engine alignment as close to perfect as possible and then shimming the pump ears to get wear ring clearances evened out made for one fantastic improvement in my hole shot and time to get on plane.

My boat and the original completely rebuild pump housing required three of the shims on the top left stud and two on the top right to obtain a clearance of .007 all the way around the wear ring to any of the new impeller blades no matter where they were rotated to inside the pump.

Check the SD parts schematic for my boat (97 Challenger Single) you'll see the shims listed as PN# 204120067 and boy are they proud of those $$$.

 

[97explorer717]

So is it my understanding that the plastic pump housing is twisting as I bolt it to the hull. It seemed like it did not want to set flat at the top studs. Is this something I can do myself? The local dealers don't even have the alignment tool anymore. I have came close to buying one.

 

[FinnExplorer]

I have oem wear ring, aftermarket impeller and no shims in the studs. It was a bit tight at first but nothing too bad. Might be the sbt wear ring that's causing you trouble. So why are there shims with brp part# if oem wear ring won't need them lol ? Explorer microfiche don't have them either.

Edit. Never mind get the point of shims... my pump just luckily tightened evenly and centered.