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Old 03-11-2018, 05:29 PM   #1
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Mainship 350/390 Cutless bearing replacement

Hello trawler friends! My propeller is off so Im going to replace my cutless bearing on my 1999 Mainship 350/390. Single engine 1 3/4 shaft. Any tips on the removal of the Cutless bearing would be appreciated. I see two set screws on the starboard side. Do I simply remove those, and then drive some kind of punch from forward to aft on the old bearing? Thank you.

Alex

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Old 03-11-2018, 06:50 PM   #2
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This is something I feel confident I can do, but I choose to let the yard do it. The hydraulic press and special tools most yards use to remove and replace make the job easy, right tool for the job.
If something goes sideways, a fix might cost extra days on the hard.
If you do choose to DIY, I'm sure there's a you tube video on how to.

Just my $0.02

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Old 03-11-2018, 07:08 PM   #3
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Thank you Keysdisease!
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Old 03-15-2018, 08:51 PM   #4
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Just had my 2000 MS 390 cutlass bearing replaced...it was a challenge for the yard staff. They had all the tools, and still took them almost a day to do. While prop was off, had them strip barnacles and polish the brass like new (also did the rudder as well).
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Old 03-15-2018, 10:34 PM   #5
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Changed loads (hundreds of bearings over many decades in the marine industry. Not something to do lightly, and depends on the installation type. Lots of tricks to learn. However you can get the right tools for your boat (don't need to buy the whole kit) from https://strutpro.com/ They have lots of videos etc. Should give you enough info. Beating bearings out normally frigs the whole installation up and you finish paying the yard to put it right.
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Old 03-16-2018, 02:56 PM   #6
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I talked to the yard. They have the hydraulic kit. Theyre going to mic the old bearing and give me the dimensions so I can order one which will be cheaper. Then theyll freeze the new bearing and swap it out.
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Old 03-19-2018, 10:12 AM   #7
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Quote:
Originally Posted by HeatherAlyssa View Post
Then theyll freeze the new bearing and swap it out.
LOL, reminds of my days riding dirtbikes. I used to do 1-2 sets of wheel bearing replacements per season. Not nearly as complex as a cutlass bearing, but same basic principal. I used to freeze the bearings to ease installation. You should also be able to heat the strut to expand it prior to installation as well. I would be very, very careful not to overheat it. If my wheel hub was too cold, I could hit it with a butane torch for a bit to warm it up and expand it a little. It was the difference between pressing in the bearing and having to beat it into place (which is not ideal, especially on a strut).
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Old 03-30-2018, 11:33 AM   #8
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Got the new bearing. Ill tell you what I pay for installation when Im done.

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Old 04-08-2018, 04:38 PM   #9
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Update. $225 for the installation. I bought the bearing myself for $114. Im pleased.
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