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

FSH 210 Sport

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Bruce

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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
IMG_4876.jpeg

This is port
IMG_4878.jpeg

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.

IMG_4877.jpeg
 

Cobra Jet Steering LLC

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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
 
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