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#2706864 - 10/06/08 02:01 PM
n overheating over 4500rpms
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Green Horn
Registered: 09/18/05
Posts: 17
Loc: leander,tx
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My 1999 Johnson 115 seems to run a steady stream out the "peehole" at idle, but set off the "hot" alarm, and shut itself down when operating at WOT. Should a new impeller fix the problem, and if so, any tips on doing this? My last impeller job was on a 15HP Seaking, back in the early '80's.
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#2706904 - 10/06/08 02:16 PM
Re: n overheating over 4500rpms
[Re: lowbass]
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TFF Celebrity
Registered: 03/19/08
Posts: 7315
Loc: Lakeside Village (Morgan, TX)
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I don't know that engine well enough to tell you exactly how to do it...However, yes, that should fix the problem...If it doesn't it might be a thermostat..If the impeller hasn't been changed in a while (a year or longer), it's time to change it...
_________________________
I'd like to thank every person who is serving, or has served, in the United States Armed Forces. It is because of y'all that we enjoy the freedoms we do. 
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#2707382 - 10/06/08 04:37 PM
Re: n overheating over 4500rpms
[Re: lowbass]
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Outdoorsman
Registered: 12/06/03
Posts: 141
Loc: sherman texas
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I have a 175 that had been overheating lately I pulled the lower unit inspected impeller and housing(looked Good)Had been peeing fine with 6pound water pressure. Put back together no luck. changed thermostats no luck. tore back apart bought new waterpump assemby. Now put back together 10psi water pressue no overheat. Finally Fixed
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#2708059 - 10/06/08 08:33 PM
Re: n overheating over 4500rpms
[Re: TRAILBOSS]
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Green Horn
Registered: 10/06/08
Posts: 4
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115 water pump impeller change is easy if you have done it i time or two call me and i can walk you through it 903-603-8906
shane
Ballistic marine service
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#2708544 - 10/07/08 05:21 AM
Re: n overheating over 4500rpms
[Re: Ballisticmarineservice]
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TFF Guru
Registered: 02/16/06
Posts: 13053
Loc: LA and TX
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Welcome to TFF, Lowbass and Ballistic.
Swap out the whole waterpump. Get the kit with the stainless plate and housing. Like they said, it's not a tough job. Just buy a manual and take your time.
_________________________
 No, it wasnt me. You didnt actually SEE me, did you ? You are merely speculating. Besides, I was busy being banned from the PETA site that night....and proud of it. ( they didnt like my wild game recipes)
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#2718198 - 10/09/08 02:37 PM
Re: n overheating over 4500rpms
[Re: Oldfrog]
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Green Horn
Registered: 09/18/05
Posts: 17
Loc: leander,tx
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Thanks for all the help guys! I ordered a BRP(omc) impeller kit with housing, and a Johnson manual, both for just over $100 delivered.
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#2719429 - 10/10/08 01:40 AM
Re: n overheating over 4500rpms
[Re: lowbass]
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TFF Guru
Registered: 02/16/06
Posts: 13053
Loc: LA and TX
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If it's like my older model, you need to PAY attention to what the manual says about the shift rod. Mine is a hard to get to bolt underneath the carbs, yours may be different.
_________________________
No, it wasnt me. You didnt actually SEE me, did you ? You are merely speculating. Besides, I was busy being banned from the PETA site that night....and proud of it. ( they didnt like my wild game recipes)
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#2745511 - 10/17/08 04:45 PM
Re: n overheating over 4500rpms
[Re: Oldfrog]
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Outdoorsman
Registered: 04/28/06
Posts: 151
Loc: Gladewater ,Texas
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long 1/4 in. ext. 3/8 wobble socket its easy,make sure to grease the driveshaft b4 u put it back
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J R
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#2745583 - 10/17/08 05:09 PM
Re: n overheating over 4500rpms
[Re: ragin18cajun]
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Extreme Angler
Registered: 08/06/07
Posts: 1308
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be careful not to damage the rubber grommet the shift rod passes through undeer the carbs
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