Changing Yamaha Jet Boat Pump (Duct Housing) Bearings and Switching to Oil Bath Lubrication

[FSH 210 Sport]

Does anyone use the 518 anaerobic gasket maker between the housings like Yamaha calls for ?

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Yes, this stuff works great. It stays tacky…

 

[Bruce]

Just pulled my pumps to top off the oil in rear bearing housings. I believe that July of 2018 was the last time I had opened up the cones. The bearings look good and feel good. They were installed in 2016 so six years on the bearings and four years since I have topped up the oil.

Both cones had a nice vacuum seal when opening. Both had significantly less oil than I initially put in but the bearings were well coated. There was no sign of water intrusion.

How the gear oil escapes remains a mystery.
I poured out the oil and found it to be a thick slurry with the grease I had packed the bearings in.

This is starboard


This is port


I filled the housings with fresh gear oil then I filled the cone with marine grease. I believe it will mix once the shaft starts spinning.

 

[Cobra Jet Steering LLC]

I make sure I use some silicon seal on the o ring when I put the cone back on just to be sure it seals good

 

[madtom]

May 2024 Update to my oil bath conversion.....

Pulled pumps, pulled caps, no signs of water intrusion, added a little more oil to starboard.

Port was full.

Both looked like a nice oil/marine grease slurry. No pictures today as I was trying to beat the thunderstorms rolling in. Still haven't figured out where the oil goes.... No moisture in there though.

Added grease to the caps put new Yamaha O-rings in and added a smidge of gasket maker RTV and sealed them up....I couldn't find my tube of black or gray RTV so it was the red transmission stuff I used...so the caps have this red ring at the seam now lol.

gonna to go 24-36 months till next check unless I hear noises (have a complete set of parts(seals/bearing) in the shed for both pumps just in case . Only put like 40 hours on it last year and will probably do the same this summer based on work schedule.

 

[Nikokrzynowek]

Question for you guys that have rebuilt the pumps before. I just pressed both bearings onto the drive shaft with the outer race spacer. Is the spacer supposed to be a snug fit and not be able to move? My spacer moves side to side and isn’t held between both bearings. Just want to make sure I am doing this correctly

 

[madtom]

Question for you guys that have rebuilt the pumps before. I just pressed both bearings onto the drive shaft with the outer race spacer. Is the spacer supposed to be a snug fit and not be able to move? My spacer moves side to side and isn’t held between both bearings. Just want to make sure I am doing this correctly

The spacer is supposed to be a snug fit... if you go back to swatski's post 77 https://jetboaters.net/threads/chan...ing-to-oil-bath-lubrication.10155/post-496143 it has the images/ detailed instructions from the service manual. although the years are different the procedure is almost identical.

The distance the bearings are pressed (gives measurements in the manual) on the shaft sets the shaft position in the pump for assembly.
for a good understanding of the assy process...... here is the one i learned from put together by someone on the GPR wave runner forums..

 

[granpachuck]

The spacer is supposed to be a snug fit... if you go back to swatski's post 77 Changing Yamaha Jet Boat Pump (Duct Housing) Bearings and Switching to Oil Bath Lubrication it has the images/ detailed instructions from the service manual. although the years are different the procedure is almost identical.
View attachment 220573
The distance the bearings are pressed (gives measurements in the manual) on the shaft sets the shaft position in the pump for assembly.
for a good understanding of the assy process...... here is the one i learned from put together by someone on the GPR wave runner forums..

Hi guys,

I am getting ready to pull pumps and check the bearing grease. Can someone direct me to a link or post that has a list of the grease, oil, and other materials I need to order? I already have the O rings. I had the post saved, now I cannot find it.

Thanks in advance !

 

[Cobra Jet Steering LLC]

Hi guys,

I am getting ready to pull pumps and check the bearing grease. Can someone direct me to a link or post that has a list of the grease, oil, and other materials I need to order? I already have the O rings. I had the post saved, now I cannot find it.

Thanks in advance !

Are you adding gear lube to the grease to liquify it and in the intermediate bearing also? if not you should!
Search results for query: grease in intermediate bearing

 

[granpachuck]

I will do that, thanks ! I just received some Fram oil filters you rec'd in an older post . Bought them for the Yamaha, my sons car, and one of mine. Fram thanks you, I am sure.

I think we needed some grease for the splines too. I will keep searching for that. Thanks again.

 

[Cobra Jet Steering LLC]

I will do that, thanks ! I just received some Fram oil filters you rec'd in an older post . Bought them for the Yamaha, my sons car, and one of mine. Fram thanks you, I am sure.

I think we needed some grease for the splines too. I will keep searching for that. Thanks again.

the drive shaft splines try bees wax water won't wash it off

 

[FSH 210 Sport]

Hi guys,

I am getting ready to pull pumps and check the bearing grease. Can someone direct me to a link or post that has a list of the grease, oil, and other materials I need to order? I already have the O rings. I had the post saved, now I cannot find it.

Thanks in advance !

Do you have a service manual? All of the materials needed for pump R&R are listed in the service manual.

 

[granpachuck]

Do you have a service manual? All of the materials needed for pump R&R are listed in the service manual.

I dug it out, forgot I even had it , thanks for the reminder !

 

[granpachuck]

I dug it out, forgot I even had it , thanks for the reminder !

Embarrassing that I needed a reminder that the info I was searching for was within arms length. Thanks to all the great posts on here, the manual, and you tube, I worked up the courage to remove the pumps. Its scary how tight the bolts are, and I felt all 8 of them were ready to snap off.
Bearings all looked great, cone was free of water, plenty of grease in them still. Just shy of 300 hours and everything looks like new.
Gonna hit a few small items on the boat tomorrow, but all done with the pumps.

 

[drewkaree]

I felt the same way with the bolts, but I think it was the white sealant used on them @FSH 210 Sport has identified that product, and reapplied it to his, while I chose to live dangerously close to the edge and just reinstall the bolts with a devil may care attitude and a healthy dose of crossed fingers.

I dunno if I will end up with any repercussions for my decision, but the manual DOES point out what to reapply when reassembling everything. Best not to follow my direction. I'm starting to sound like my wife now