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Old 06-22-2020, 03:05 PM   #1
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1980 Mainship MK1 bulkhead mounted bearing size

I want to add a zerk extension hose to the aft support bearing for greasing and looking for any bearing info Mainship used for 1980 34 MK1. Ours must have been put in backwards since the zerk fitting to grease is AFT of the bulkhead, under the water tank(that's right!) under the tank. You can imagine what a PIA this is to service without a zerk extension hose.
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Old 06-23-2020, 03:05 PM   #2
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Torrington/Fafnir RCJC 1 3/8 Assuming you have a 1 3/8 diameter prop shaft.
If different diameter, then it's RCJC (blank).

That company is out of business, however any industrial supplier can cross reference that number to a current manufactured bearing of that style.
Yes the bearing is installed correctly or at least that's what Mainship thought.
You could move it to the forward side of the bulkhead when you do the new one.
(The 1978 models had the bearing on the forward side of the bulkhead. I was able to change mine without removing the prop shaft. I could slide the shaft back far enough to make the change)

TIP The bearing inner race has a set screw (maybe 2 180 deg apart) that secures the race to the shaft.
Remove that first or you'll never get it to budge.

Hope this helps.
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Old 06-23-2020, 04:15 PM   #3
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Jay, you're a definite asset to the forum & especially the classic Mainship community. I was talking to Dave this morning about his bearing issue and forgot to mention to him that you would know which bearing he would need if his was bad. I can imagine you were thought of as a rock star back in the day when you were an owner. And while I have you on the line, I want to take the time to sincerely thank you for helping me find the source of the oil leak that appeared on our Perkins last summer. I was thinking seals but I just couldn't trace down the exact source. I googled it and a it lead me to a post you made about the starboard forward engine mount fasteners being drilled into the oil passage. I inspected the mount underneath and it was wet. I pulled the studs one at a time,resealed with Permatex #2 and after a couple of cruises ,the bilge is oil free. I believe that lemon has been squeezed!
Viva La Internet & Jay Leonard.
Thanks again.
Now lets get David Kimmel going!
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Old 06-23-2020, 04:42 PM   #4
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We had an 81 Mainship in the 90's.

The bearing was frozen to the shaft when we bought it. Disconnected the coupling and unbolted the bearing from bulkhead and slid the shaft back to make access to the bearing easier. Tried undoing the set screw but no luck. Cut the bearing off and replaced it with a split bearing to make future access easier. Installed the bearing forward of the bulkhead.

The existing bearing is gimbaled to allow for the angle of the shaft to the perpendicular bulkhead. I think they are called angular bearings or angular contact bearings.

When installing a new bearing with different bolt pattern to the previous bearing, make sure you compensate for shaft drop. Our Mainship had a bronze shaft which was not as ridgid as a SS shaft and sagged without the bearing.

If your shaft has been replaced with a SS shaft, an intermediate bearing may not be necessary. Check with a prop shop or Google to see what the mid support requirements are for a shaft with your diameter.
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Old 06-24-2020, 10:45 AM   #5
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Quote:
Originally Posted by syjos View Post
We had an 81 Mainship in the 90's.

If your shaft has been replaced with a SS shaft, an intermediate bearing may not be necessary. Check with a prop shop or Google to see what the mid support requirements are for a shaft with your diameter.
In THEORY it may not need the bearing, but in application it does IMO.

I tried eliminating the bearing but as I was tightening the prop nuts I could feel and see the shaft flexing quite a bit. It was a 1 1/2 inch dia Aquamet 22 (stainless) shaft.
So I put the bearing back in.
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Old 06-24-2020, 10:26 PM   #6
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When I had my 1975 Mk1 I purchased the replacement bearing from Grainger supply, had it milled at the shop so it would slide on (I think a few thousandths), then relocated to the other side of the bulkhead for service and future in-water replacementóno need to back the shaft all the way out.
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Old 06-26-2020, 03:49 PM   #7
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Odd, my '84 MKIII has an extension "tube" on the bulkhead bearing that makes re greasing easy from the cockpit access. can't see down there, so I wonder what they did years ago?
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Old 06-26-2020, 04:42 PM   #8
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Mine is on the back of the bulkhead. It's possible to get a grease gun in there, but not easy. I too wondered why it was on the back.
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Old 06-27-2020, 07:20 AM   #9
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In the original model Is the generator sat over the bearing so it was impossible to get at. I'm sure that's why they moved it to the aft side of the bulkhead.

I was able to cut an access hole in the floor to be able to get to it. Covered the hole with lexan so I could do a visual from time to time.
I removed the grease fitting, added a hose and an automatic grease cup
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