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'99 Mercury four stroke issue - Walleye Message Central
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  #1  
Old 03-20-2017, 11:34 AM
JRinNE JRinNE is offline
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Default '99 Mercury four stroke issue

Was out this weekend made a couple of 15 minute runs to different spots with no issues. Got to next spot, was cruising about 5mph with engine trimmed up slightly, watching sonar and the engine alarm sounded. I looked as I went to shut it down and there was a good stream of water coming out motor. I also checked the oil and it was at the correct level. Waited a while fired it up and headed for the ramp with no problems. When I went to load it up, I trimmed the motor up some and idled up to the trailer the alarm sounded again. Any ideas?
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  #2  
Old 03-21-2017, 03:00 AM
gravelcarp gravelcarp is offline
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Do you have a temp. gauge on it? Any recent service to impeller or t-stats? I'd take it for a readout. Probably cost you less than throwing parts at it. If any of these items have not been serviced in awhile you might want to consider it.
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Old 03-21-2017, 10:40 AM
Spendit Spendit is online now
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I had same issue with my '99 - stream looked good but water was not getting to top of head (where sensor is). I experimented when alarm was going off, I covered hole with finger and alarm quit. I fixed it by putting a slight restriction in witness hole outlet - brass wedge with thru whole in it.

I did this as a new H2O pump did not solve issue sometimes.....buddy still has the ole boat and no issues after all these years
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  #4  
Old 03-22-2017, 03:59 PM
JRinNE JRinNE is offline
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Very good thanks for the replies. Gives me somewhere to start.
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Old 03-22-2017, 05:51 PM
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troutbeer troutbeer is offline
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Very cold water temps can cause sticky poppet valves at idle. That might explain a temp alarm at idle but not at higher rpms.

TB

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Old 03-25-2017, 06:42 PM
JRinNE JRinNE is offline
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Thanks again
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