OMC Gear Case

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labrador guy
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OMC Gear Case

Postby labrador guy » Sun Oct 07, 2018 10:45 pm

I been working on a OMC five bolt lower unit today. The previous owners had the gear case apart at least four times. Missed the alignment pin every time! Anybody know how to pull the locator pin back up where it belongs?

dale
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crosbyman
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Re: OMC Gear Case

Postby crosbyman » Sun Oct 07, 2018 11:10 pm

strong magnet ...won't work I guess !
Last edited by crosbyman on Mon Oct 08, 2018 8:47 am, edited 2 times in total.

bobw
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Re: OMC Gear Case

Postby bobw » Sun Oct 07, 2018 11:47 pm

I pulled one by center punching the pin, drilling a hole, threading a self tapping screw into the pin, then pulled on the screw head with pliers. Just prior to pulling on the screw head, I applied some heat to the housing to help expand the pin hole just a bit. Made a new pin from some rod stock I had. Takes a lot of patience to get this done. If you can get the pin punched exactly dead center, guess you might be able to just drill the pin out kind of like drilling out a broken head bolt.

Here's a link where I got the idea:

https://conductorjonz.wordpress.com/201 ... p-day-two/

Scroll down the page a little ways to see how this guy did it.
Bob
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BillW
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Re: OMC Gear Case

Postby BillW » Mon Oct 08, 2018 5:26 am

I did one by drilling an angled hole down from the OUTSIDE, on the nose, down to meet the hole where the pin is. Then I drove the pin out to it's normal depth with a pin punch, tapped my drilled hole and Loctited in a stainless set screw. I think I used a #10-24 set screw, so I picked a drill size for that. I'm not particularly proud of it but it worked.

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Richard A. White
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Re: OMC Gear Case

Postby Richard A. White » Mon Oct 08, 2018 7:38 am

I made a jig, drilled into the pin, tap it, then use the puller I made to remove the pin, worked very well.

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outbdnut2
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Re: OMC Gear Case

Postby outbdnut2 » Mon Oct 08, 2018 10:41 am

Would it work to just drill another hole near the pin and put a new pin in that hole? It looks to me like the pin just keeps the bushing from turning, and the exact location is not critical. Somebody please correct me if I'm wrong. If the old pin is sticking up a little bit, it could be filed or ground down flush with the housing.
Dave

Chris_P
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Re: OMC Gear Case

Postby Chris_P » Mon Oct 08, 2018 11:24 am

Correct Dave. Sometimes easier to simply drill a new hole and install a new pin. Some don't have room, but most do. THat is the route I prefer when possible.

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Richard A. White
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Re: OMC Gear Case

Postby Richard A. White » Mon Oct 08, 2018 12:12 pm

I would add that while drilling a new hole would be faster, imagine if you drilled it in the wrong location??? Like too close to the gears, then it would not go together...
I can duplicate the jig I made, pretty simple and then you know the hole is correct.. I have drilled enough holes in aluminum to teach me that if it aint jigged properly all bets are off on where that hole will wander to, notice I did not say IF it moves...

Your mileage may vary, as not everyone has the experience to do that properly....

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labrador guy
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Re: OMC Gear Case

Postby labrador guy » Mon Oct 08, 2018 9:53 pm

Thanks for the ideas! I might just mark the bushing so it will be in the proper spot when I put it back together. I have a L of a time drilling anything straight! The oil hole is suppose to align with an oil galley under the bushing. But it has ran plenty out of place and it did not seam to hurt anything. Maybe I'll try some supper glue! It is suppose to hold a ton.

dale

fleetwin
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Re: OMC Gear Case

Postby fleetwin » Tue Oct 09, 2018 6:53 am

I would also take a moment to slip the gear into that messed up bushing and spin it...The bushing may have been deformed/crushed after being misinstalled a few times.


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