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#11040973 - 08/13/15 10:00 PM Help....Engine overheating alarm sounding
Lake Fork Inn B&B Offline
Pro Angler

Registered: 11/07/13
Posts: 530
Loc: Lake Fork, Texas (Wolf Creek)
..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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#11041003 - 08/13/15 10:12 PM Re: Engine overheating alarm sounding [Re: Lake Fork Inn B&B]
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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#11041022 - 08/13/15 10:20 PM Re: Engine overheating alarm sounding [Re: Lake Fork Inn B&B]
Lake Fork Inn B&B Offline
Pro Angler

Registered: 11/07/13
Posts: 530
Loc: Lake Fork, Texas (Wolf Creek)
Merc 250 xb
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#11042723 - 08/14/15 07:51 PM Re: Engine overheating alarm sounding [Re: Lake Fork Inn B&B]
hopalong Offline
Pumpkin Head

Registered: 09/06/08
Posts: 78895
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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#11042836 - 08/14/15 08:55 PM Re: Engine overheating alarm sounding [Re: Lake Fork Inn B&B]
DKennimer Offline
Extreme Angler

Registered: 03/01/10
Posts: 2883
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: Lake Fork Inn B&B]
Lake Fork Inn B&B Offline
Pro Angler

Registered: 11/07/13
Posts: 530
Loc: Lake Fork, Texas (Wolf Creek)
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....
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#11042960 - 08/14/15 10:04 PM Re: Engine overheating alarm sounding [Re: Lake Fork Inn B&B]
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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