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#12002458 - 12/24/16 10:48 PM Clunking in lower unit
HornedFrog'07 Offline
Outdoorsman

Registered: 05/31/11
Posts: 197
Loc: Dallas, TX
Changed my impeller plugs and fuel filter and everything seemed to go smoothly. Engine was running great before I performed the maintenance. Put muffs on and let the engine warm up. Put it in gear and everything seemed great. Put it in reverse and the lower unit was clunking every few seconds. It was almost like the gears were broken in the lower unit. Forward it seemed good but reverse it was not. I turned it off and restarted only to hear the same thing again.

Mercury 115HP 2 stroke.

Wondering if I need to take it in and what I could have done wrong changing the impeller to have caused this. Please help!
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#12003502 - 12/25/16 08:25 PM Re: Clunking in lower unit [Re: HornedFrog'07]
Topwater2 Offline
Pro Angler

Registered: 03/06/14
Posts: 680
I've got nothing but keep us informed when you find out what it is.
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#12003887 - 12/26/16 05:25 AM Re: Clunking in lower unit [Re: HornedFrog'07]
HornedFrog'07 Offline
Outdoorsman

Registered: 05/31/11
Posts: 197
Loc: Dallas, TX
Ttt
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#12003947 - 12/26/16 06:59 AM Re: Clunking in lower unit [Re: HornedFrog'07]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10967
Loc: Littlefield Tx & Lake A. H. US...
Shift cable adjustment. Not fully engaging into reverse. Adjust cable slightly toward reverse.
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#12005247 - 12/26/16 10:11 PM Re: Clunking in lower unit [Re: HornedFrog'07]
OPTI Offline
Extreme Angler

Registered: 06/23/04
Posts: 1405
Loc: Benbrook Tex
Actually if you have a stainless prop this is normal when running on earmuffs cause there is no load on the prop. ....OPTI
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#12032912 - 01/10/17 09:25 PM Re: Clunking in lower unit [Re: HornedFrog'07]
HornedFrog'07 Offline
Outdoorsman

Registered: 05/31/11
Posts: 197
Loc: Dallas, TX
Ttt
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#12034894 - 01/11/17 08:51 PM Re: Clunking in lower unit [Re: HornedFrog'07]
OPTI Offline
Extreme Angler

Registered: 06/23/04
Posts: 1405
Loc: Benbrook Tex
Do you have a Stainless prop have you checked the gear lube check the bottom drain plug has a magnet on the plug well some did some didn't and if you have gear damage the metal from the damage will collect on the magnet. Now you will have some I call it fuzz on the magnet that's normal but if you put the fuzz between your thumb and index finger and rub it between your finger and your feel small chunks there is a problem. I have heard them rattle with a alum prop also but not a loud.....OPTI
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#12035247 - 01/12/17 06:09 AM Re: Clunking in lower unit [Re: HornedFrog'07]
Bulletman99 Offline
Angler

Registered: 10/26/16
Posts: 437
Loc: South Texas
Opti is correct a "clunk" is normal when not under a load and it is still possible your shift cable needs a minor adjustment. Cables can wear over time and stretch slightly and need to be adjusted back within specs.
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