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Motor over heating alarm #14058531 07/11/21 02:28 PM
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TPACK Online Content OP
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I have a 94 Evinrude 88 SPL. The engine hot alarm (whistle) has been an issue for years if I go much over 30mph. I finally had the impellor replaced 3 months ago and have always thought it was the problem. I was on the water last week and going about 34 mph and it went off again. I stopped , put it in neutral and raised rpm`s slightly till alarm went off(about 20 seconds). I went to Whitney this week and went across lake over 5 miles @ 28-30 mph and engine alarm never went off. I can run less than 30 mph and troll for 3-4 hours and never have a problem either. I believe it is time to replace the thermostats. I bought boat new and it has never been replaced.

Last edited by TPACK; 07/11/21 03:37 PM.
Re: Motor over hearting alarm [Re: TPACK] #14058585 07/11/21 03:35 PM
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I would and poppet valves.


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USAF "Thunderbirds" Alumni 1985-1989

Okie by birth, Texan by choice.
Re: Motor over hearting alarm [Re: TPACK] #14059997 07/13/21 01:24 AM
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pop r Online Content
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PM sent

Re: Motor over hearting alarm [Re: TPACK] #14061524 07/14/21 03:12 PM
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redchevy Offline
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Thought popet valves were a mercury/yamaha thing?

I would suspect the thermostat if it hasnt been service.

Have a family member who has about the same motor that has been used in salt water extensively and has similar issues, pretty sure it has considerable internal corrosion in the water jackets.

Re: Motor over hearting alarm [Re: TPACK] #14061882 07/14/21 07:07 PM
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pil,b Offline
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After all the years why worry about, just drive it like you stole it

Re: Motor over hearting alarm [Re: pil,b] #14063910 07/16/21 03:04 PM
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Originally Posted by pil,b
After all the years why worry about, just drive it like you stole it


I probably will. I was on the water yesterday and kept it below 30 mph all day. When I headed for the ramp I kicked it up to 34-35 mph to see what it would do and it took about 30 seconds for the alarm to go off. I checked the stream of water coming out of the little hole on the motor and it was the same as it was when I had been trolling @ idle speed(2.2 mph).

Re: Motor over hearting alarm [Re: TPACK] #14072391 07/24/21 10:04 PM
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OldChamp Offline
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Had similar problem with my '89 150 Yam ProV - overheat warning horn at higher rpm.

Over the years the cylinder heads/water jackets water passages had built up a crud accumulation that restricted the head's cooling water passages and holes. Some of the heads water passages and holes were blocked by the crud buildup.

I pulled the heads and soaked them in a mixture of half/half warm water and white vinegar and then scraped out the remainder of the crud from the water passages.

I believe there's also cooling system flush kits/chemicals that can be also used without taking heads off.

If water pump and thermostats are OK this the most likely the problem.




Re: Motor over hearting alarm [Re: TPACK] #14073147 07/25/21 09:42 PM
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BCOU Offline
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I had a old Merc EFI that would alarm periodically and it ended up being one thermostat not working.

Re: Motor over hearting alarm [Re: TPACK] #14073591 07/26/21 01:41 PM
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Check pop value and thermostats


Hughes Marine
3855 Osage Lane
Wylie ,Texas
Re: Motor over hearting alarm [Re: boatman025] #14081673 08/02/21 11:18 PM
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My Mercury 200 EFI was doing the same for a couple of years..frustrating to say the least. We changed multiple impellers and checked practically everywhere water flows for an obstruction..no luck. .Finally we changed the impeller housing as well and problem solved..upon inspection the old housing had become "slightly"oval in shape and evidently decreasing water pressure causing it to over heat at higher rpm..."note to self..Always check the housing when changing the impeller.."

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