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XPC Cutless Bearings

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    Posted: May-04-2015 at 10:58am
I installed the new fancy Cutless Bearings and was wondering how much clearance these are supposed to have on a 1 inch shaft? I inspected my shaft and it is .001 under so i am sure this is is good. Then i checked the inner dia of the bearing and it checks plu .015 in one and plus .020 in the other bearing. So am i to assume this is acceptable or did they screw up on the machining of these bearings? Has anyone ever checked these before.?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Jonny Quest Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2015 at 11:51am
If you haven't already done this, it is strongly recommended that you perform a shaft alignment after re-installation.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote JoeinNY Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2015 at 11:56am
I would give OJ a call and ask... I don't recall there being quite that much clearance but its been a while.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sleepyone Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2015 at 12:06pm
Talked to Discount inboard marine ( Great guys by the way ) Looks like i may just go back to the old Cutless bearing material instead. Not happy ! XPC bearings drove in with a light press from a ARBOR press and felt smooth all the way in I was feeling good till i say how they fit on the shaft!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2015 at 7:25pm
Randy,
Was the slop with the XPC's before or after the press fit into the Strut? I think it was Tim who tried them several years ago and if my memory is correct, his were too tight! BTW, I still stick with the good old rubber in a brass shell too!


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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2015 at 7:36pm
My strut body had a slight bend... The sloppy brass/rubber originals were needed to take up the difference without binding. I sure wish I could have use the xpc ones, they're awesome. I have the pair ready to go in my next strut that needs bushings.

Call Eric at OJ, if they're not to spec, he'll take care of you!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2015 at 9:38pm
I installed them in my 95 last year, they only have 25 hours on them now so I can't comment on long term acceptance but short term they are working great with very low drag. You can spin the prop with one finger and very low effort. Good Alignment helped but these have low drag for sure. I hope they work long term, that was my gamble.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: May-04-2015 at 10:15pm
Joe has a lot of hours on his... And that boat isn't babied! I think longevity should be a selling point.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sleepyone Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 10:25am
Talked to Eric at OJ- I sent him the Bushings i had and he is sending me a new set today with a tighter fit for my application.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JoeinNY Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 10:28am
I do have 700+ hard hours on mine, they have outlasted two ARE shafts... the last bent shaft opened them up a bit though so they are on my list to replace. My memory is that they were closer to 3 to 4 thou a side clearance when originally installed but I couldn't swear to it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote phatsat67 Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 10:32am
I wanted those but I was in a hurry and had brass/rubber in stock last spring.

Although, brass/rubber should spin extremely easily if A) the bearing is in good shape and B) a proper alignment was performed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SNobsessed Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 10:47am
& C) they are wet!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote phatsat67 Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 10:49am
Originally posted by SNobsessed SNobsessed wrote:

& C) they are wet!


That's always better right
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 1:39pm
When I installed the plastic cutlass bearings I was nervous they would move in the log so I drilled and tapped the bearings so the Log Set screws would hold them in place.. I used red locktite to hold the set screws in place and I located the screws in the thicker part of the bearing not in the water channels. The screws don't go deep enough to endanger the shaft.
When I tried to install the set screws without the drilling and tapping it seemed to be collapsing the plastic on the shaft. The change to a drilled and tapped bearing seemed to work/help and it is still in operation, again only 25 hours but 25 smooth hours with zero drag in the shaft log and they have not moved yet.
If I ever need to remove them it will be a far easier job than cutting and pressing out the OE style cutlass. That was a chore.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sleepyone Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 5:33pm
Talked to Eric at OJ and he is sending some bearings to allow more press fit to my strut. They tipically like to see .014 press on this bearing and the ID size is made bigger to allow for collapse down to the 1" size. In looking at this, all these older boats really should of had a larger strut under them to allow for a larger bearing OD size because getting down to 1" from the 1.250 with water grooves cut in the bearing is not a good engineering solution. Yes i know been that way for 100 years. But that dont make it right..
I dont feel comfortable with trying to lock it down or collapse the bearing with the setscrew. It should be soley there for security to insure the bearing dont slide out of the bore.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: May-05-2015 at 7:10pm
Originally posted by Sleepyone Sleepyone wrote:

In looking at this, all these older boats really should of had a larger strut under them to allow for a larger bearing OD size because getting down to 1" from the 1.250 with water grooves cut in the bearing is not a good engineering solution. .

Randy,
I'm confused! What does thickness have to do with the load bearing capacity? Maybe you need to do some calculations? Start with the radial loading of the prop shaft and compare that to the compressive modulus, (ASTM D695) of the material in question. As a comparison,, keep in mind that some PTFE lined metal bushings are running at about a thickness of .010" with the plastic.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: May-06-2015 at 1:51am
Originally posted by MrMcD MrMcD wrote:

I installed them in my 95 last year, they only have 25 hours on them now so I can't comment on long term acceptance but short term they are working great with very low drag. You can spin the prop with one finger and very low effort. Good Alignment helped but these have low drag for sure. I hope they work long term, that was my gamble.


Mark I'm curious yours being a low hour boat did you change just so you know where your at or was it worn already?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: May-06-2015 at 4:27am
I bought the boat with 100 hours and 20 years old. The previous owner had damaged the prop and bent the shaft. They fixed the prop but drove it with a bent shaft until they sold it.
The cutlass bearing was worn out as was the coupler at the tranny from all the movement and vibration.   I do not know how many hours it was used with this bent shaft in place.
I had it out for 10 minutes and knew it needed the repair. But I bought it anyway because it was really clean and perfect cosmetically. I could fix the rest.
( Until 4 deer came out in front of me and I wrecked it last August )
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JoeinNY Quote  Post ReplyReply Direct Link To This Post Posted: June-29-2015 at 11:46am
So I got a new set of XPC bearings the other day and can confirm they are definitely what I would call sloppy on a 1 inch shaft. I haven't installed them in the strut yet to see if that will tighten them up, frankly a little scared to do so because I don't think they have a chance of working. They are quite a bit more loose than the 700 hour old xpc bearings that I am replacing... after spending a grand on bearings, a prop and a shaft I fear a little play is going to make me a little crazy.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: June-29-2015 at 11:59am
Just did the same thing on Rico's skier and they seemed looser than I would have liked prior to installation. We put them in anyways and between the strut compressing them slightly and the shaft installed between both bushings, the slop was essentially eliminated.

That said, if you have the luxury of time (prior to the planned install), I'd give Eric at OJ a call and see what he says. If they're out of spec, he'll take care of you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orlando76 Quote  Post ReplyReply Direct Link To This Post Posted: June-29-2015 at 12:00pm
I felt the same way with my XPC's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sleepyone Quote  Post ReplyReply Direct Link To This Post Posted: July-02-2015 at 4:11pm
I went back to the Bronze rubber bushings after trying two sets of the XPC. both sets of the XPC had more clearance in the ID after installation. I wish I had some of the XPC bearing material and I could turn my own and reduce the clearance but it is going to be very hard to accommodate size range on a harder bearing material like the XPC with as much difference as I have seen in the strut ID Bore..    Wish I could of used the XPC I liked the concept and how they feel if you can get the clearance tight enough.
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