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| Boat Fishing & Boating A new forum at Striped-Bass.com for those fishing from boats and for boating in general |
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02-22-2007, 05:06 PM
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#1
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zoom
Join Date: Apr 2002
Location: Quincy
Posts: 4,145
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Lower Unit Plug Repair--STEP 1
Well that freakin' lower plug on my engiine finally stripped the threads on the gear case. I took the LU off and brought it to the dealer. They gave it a valiant try by drilling out the case, and installing a helicoil for the plug. But it would not hold during the pressure test.
The helicoil is not perfectly aligned to let the plastic washer make full contact.
We talked about a few fixes (such as just sealing right over the plug with marinetek or like) and forgetting about it. But I am way to picky to do that. Sooooo I took the LU home and talked to my machinist here at work. Heres step one of the plan. I will remove the helicoil and see what depth of metal remains. Seems there is plenty of material before I'm into the gearcase for some new threads. I removed the carrier to access the inside of the plug hole.
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~..~..~.. ><((((º>
Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.
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02-22-2007, 05:08 PM
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#2
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zoom
Join Date: Apr 2002
Location: Quincy
Posts: 4,145
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Remove Carrier
Once carrier is out, can barely see back side of hole in pic (at about 3 o'clock)
More to come as I progress..
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~..~..~.. ><((((º>
Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.
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02-22-2007, 07:57 PM
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#3
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Seal Control
Join Date: Nov 2002
Location: Caver, Ma.
Posts: 3,875
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I had to do this 20 years ago on a 74 Johnson,
After you get that shaft out you will need some long snap ring pliers to get the rest out.
I used needle nose vise grips and ground the tips small this way I could grab the split ring and then use the screw on the handle to closer up the ring so it comes out, same for going back in, put it in and unscrew to let the ring open back into place.
its easy when you get there, just drill and tap new hole, clean all meteal shavings out and reassemble.
Good Luck!
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"All my friends are Flakes!!"
BOATLESS 
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02-22-2007, 08:13 PM
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#4
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Hardcore Equipment Tester
Join Date: Mar 2001
Location: Abington, MA
Posts: 6,234
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Won't that require a larger plug??
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Bent Rods and Screaming Reels!
Spot NAZI
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02-22-2007, 08:55 PM
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#5
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zoom
Join Date: Apr 2002
Location: Quincy
Posts: 4,145
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MJ, I'm not going to remove the shaft. I can get to the back side of the hole and put a rag there or someting to catch the drillings. I heard putting heavy grease on the drill bit keeps more filings on the bit.
I might just clean out the case with brakecleen when I'm done to make sure all the pieces are out.
Spec, its not going to be a regular plug like we have now, the 1/4 npt is larger than the hole there now.
If not, I can go to 3/8" npt also, but I should be OK. As I progress we shall see.
I will post as I go.
I wnat to replace the shaft seal before I'm done too.
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~..~..~.. ><((((º>
Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.
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02-22-2007, 09:02 PM
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#6
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Registered User
Join Date: Nov 2003
Location: On my boat
Posts: 9,703
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How the heck did you strip the plug anyway???
Your motor isn't that old !!!
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LETS GO BRANDON
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