Need help - Pump bearings

[griggsmars]

2000 RN superjet, How do you remove the bearings in the pump to replace them. I have the impeller off and nut off the shaft. So whats the next step? Thanks

 

[Proformance1]

Search tech section. Ther eare a few good write ups, i use a press some use heat and cold.

 

[john zigler]

Here is an article I wrote a while back. Stock pump is the same. I do not recommend using a press.

http://watercraftjournal.com/quick-tech-how-rcjswatcon-rebuilds-a-solas-pump/

Also have bearing kits in stock;

https://www.watcon.com/jet-pump-dri...it-for-yamaha-sj-and-other-144mm-yamaha-pumps

 

[eastcoastjumper]

Hit the splined end that goes into your mid shaft with a large brass hammer while the pump is supported. The shaft and rear bearing will come out the back side of the pump. The front bearing can be hammered out with a proper size socket/extension

After using the heat/cool method I wouldn't build a pump any other way.


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[griggsmars]

Thank you, those are some great write ups. I'm gonna get to work on it tonight. Thanks again

 

[griggsmars]

Has anyone used dry ice to contract the metal?

 

[Big Kahuna]

I just held the pump vertically and placed the end of the shaft on a block of wood and gave it a few good taps. May not be the best way, but not an issue when replacing bearings.

 

[eastcoastjumper]

A few hints that aren't put in johns write up

@griggsmars put the shaft and other pieces when necessary in the freezer for 2 hrs. Don't bother with dry ice.

I use an oven for the bearings rather than a torch. 250 degrees for 15-20 minutes gets them large enough to slip over the frozen driveshaft

The pump only needs to be heated for 15-20 seconds with a yellow map gas torch. Heat the bore evenly with flame away from the seals. Make sure the seals are facing down so they don't see much heat. I use a 3 inch hole in a bench or you can open a large vice 2 inches and use the edge of it to place the pump stator on while you drop the shaft and bearings into the pump. They should drop all the way down if you froze them proper and heated the pump just right.

If they get stuck halfway or almost in tap it out quick, re freeze loaded shaft and then re heat the pump and try again.

I don't use grease because it makes a mess.But I also take my pump out every 2 months to change oil (10w40) and worn props. If you are a casual rec rider then just use good marine grease.


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[griggsmars]

My freezer is too small to fit the shaft, I'll need an alternate way of cooling. How about Ice mixed with rock salt in a cooler?

 

[txsuperjetfreak96]

I've done it before in a ice chest or bucket with bag ice from the store

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