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Max Online: 36273 @ 01/23/13 02:34 PM
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#11040973 - 08/13/15 10:00 PM Help....Engine overheating alarm sounding
Mike_Kelley Offline
Angler

Registered: 11/07/13
Posts: 479
Loc: Irving texas
..need to pick your brain. Merc 250 xb
Engine over heating, no water coming out.
Pulled the lower unit, impeller in tact. Doesn't look that bad, but going to replace it and thermostats since I have it apart.
It's not discharging any water at all, idle or revved. Warning buzzer comes on in about 5 mins

Any ideas if it's not the impeller? Thermostats look v
Good. Haven't put them in hot water yet though.. But figured I would replace them anyway

Ran it two weeks ago and no issues... Today, alarm sounded unloading it....
Thoughts?????



Mike


Edited by Grasshoppah (08/13/15 11:04 PM)
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Mike kelley
Irving / Fork (Fishermans Camp)

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#11041003 - 08/13/15 10:12 PM Re: Engine overheating alarm sounding [Re: Mike_Kelley]
Matt M Offline
Extreme Angler

Registered: 12/09/07
Posts: 2302
Loc: Royse City , tx
What motor? If it's a optimax a clogged discharge tube will cause a compressor overheat and give you the same alarm
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Matts Mobile Marine Service
903-450-3539

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#11041022 - 08/13/15 10:20 PM Re: Engine overheating alarm sounding [Re: Mike_Kelley]
Mike_Kelley Offline
Angler

Registered: 11/07/13
Posts: 479
Loc: Irving texas
Merc 250 xb
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Mike kelley
Irving / Fork (Fishermans Camp)

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#11042723 - 08/14/15 07:51 PM Re: Engine overheating alarm sounding [Re: Mike_Kelley]
hopalong Online   content
Pumpkin Head

Registered: 09/06/08
Posts: 78097
Loc: drake river ranch telephone T...
mud daubers, pull the thermostat covers and use a hose to flush, see if water is circulating.

that is all I got.
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lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479

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#11042836 - 08/14/15 08:55 PM Re: Engine overheating alarm sounding [Re: Mike_Kelley]
DKennimer Offline
Extreme Angler

Registered: 03/01/10
Posts: 2851
Loc: Plano/Fork
Mike, I bet the thermostat got debris in them. If they haven't been replaced in awhile, I'd do it. You can put them in a saucepan with hot water to get them to open and get some tongs and move them back and fourth. Most of the time, you'll see wood chips. If you decide to reuse them after you clean them and you see them cycle at the right temp, check the rubber seal and replace gaskets (if not perfect). I replaced mine, just because, a year ago and I think they went to a different part number. I think it was a little higher operating temp... I can't remember 100%. I too have the XB.
Contact Rockwall Marine or Don Weed on BBC for clarification and/or parts.

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#11042904 - 08/14/15 09:35 PM Re: Engine overheating alarm sounding [Re: Mike_Kelley]
Mike_Kelley Offline
Angler

Registered: 11/07/13
Posts: 479
Loc: Irving texas
Thanks everyone...
Ended up being a spun water impeller.... Impeller was replaced last year...

Thermostats were good....
Got the impeller changed and it shows good pressure and strong stream....
_________________________


Mike kelley
Irving / Fork (Fishermans Camp)

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#11042960 - 08/14/15 10:04 PM Re: Engine overheating alarm sounding [Re: Mike_Kelley]
Matt M Offline
Extreme Angler

Registered: 12/09/07
Posts: 2302
Loc: Royse City , tx
I have only seen that one other time
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Matts Mobile Marine Service
903-450-3539

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