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Old 20-06-2019, 06:23   #1
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Lubricant for prop shaft support (on-board)

I need help.
My boat had a 1.5” shaft which has a long length inboard, about 72” from stuffing box to coupler.
Approximately midway along this length is a “support bearing” it is a 2piece block with a grease nipple on top.
I need to know what grease is best suited to this purpose.
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Old 20-06-2019, 11:50   #2
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Location: Jacksonville/ out cruising
Boat: Island Packet 38
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Re: Lubricant for prop shaft support (on-board)

Any good quality grease, probably lithium based.
One sold at auto shops for wheel bearings or CV joints would be fine.
I like “marine waterproof” grease myself, that way I feel good about using the same grease to grease the outboard and my prop which requires greasing.
I use synthetic “Green grease” but as I said any good quality grease is good
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Old 21-06-2019, 07:19   #3
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Re: Lubricant for prop shaft support (on-board)

Years ago I owned a couple of Tartan 30s, and they had a similar arrangement with a steady bearing about midway along the shaft. Originally these were split pillowblock bearings with babbet bearing material. The grease recommended by Tartan was " Lubriplate water pump grease" a fairly light white grease. The grease was fed to the bearing with a manual grease cup. As the bearing had some wear, it took a twist on the grease cup every few hours to keep the bearing quiet.

Later I replaced the babbet bearing with a ball bearing pillowblock, and swapped over the grease cup to the new bearing. Then I went to waterproof wheel bearing grease and gave the bearing a shot of grease every couple of weeks. This worked great. No noise or vibration and the slight layer of grease prevented any rust from forming.

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