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engine temp. troubles |
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Ryan S. 
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Joined: October-03-2004 Location: United States Status: Offline Points: 53 |
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 Topic: engine temp. troublesPosted: March-19-2005 at 8:50pm |
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On the second run of the season today my engine temp. gage was all over the place. It always runs very close to 160 degrees. This morning it read at 160 when up and going, but rose to 200 or so when at idle. Once up again, it dropped way down to about 120 or so before leveling off at the normal 160 degrees. The water intake is clean and the sea strainer is clear. I had the impeller replaced a few weeks ago (the old one didn't look too bad). Is this a water flow problem? Can impellers be installed incorrectly? It seemed to run well (consistent temp.) last weekend when we had it out. Unless I just missed it, though I was looking and doubt I missed it. Could it be the thermostat? Suggestions? Thanks
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Ryan
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David F
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Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Posted: March-19-2005 at 9:55pm |
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Check your thermostat. A sticking thermostat can cause the engine temp to rise to normal or above normal and then fall quickly before repeating the process.
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Brian
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Joined: June-08-2004 Location: United States Status: Offline Points: 72 |
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Posted: March-19-2005 at 11:31pm |
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I agree with David F. I have had similar problems coming our of winter storage with a sticking thermostat.
I once saw a marine mechanic tap on the thermostat with a rubber mallet to free it up. I would lean towards replacement versus the hammer fix! |
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Brian
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Ryan S.
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Joined: October-03-2004 Location: United States Status: Offline Points: 53 |
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Posted: March-20-2005 at 2:40pm |
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Thanks for the suggestions. Is there a way to check the function of the thermostat without starting up the engine?
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Ryan
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Morfoot
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Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5320 |
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Posted: March-20-2005 at 3:36pm |
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Ryan, you can remove the thermostat and attempt to "boil" it. Water boils @ 212'f so it should open way before then. Unless you have a candy thermometer that you can use to adjust the temp. Primitive but would work. Thermostats arne't that much anyway.
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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mrese
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Joined: February-18-2004 Location: Al Status: Offline Points: 93 |
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Posted: March-21-2005 at 12:18am |
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If the t-stat does not end up being the problem, you may have developed some corrosion issues over the winter. SKIDIM has a really good trouble shooting method on their FAQ page of the website. It sounds like a bad t-stat or electrical problem though.
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jameski
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Joined: May-18-2004 Location: United States Status: Offline Points: 368 |
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Posted: March-21-2005 at 11:34am |
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IMHO, I wouldn't be concerned as long as the temp leveled out. When Air gets trapped in your engine over the winter, it sometimes takes a few minutes of running to get completely refilled. Your temp guage might act a little erratic right at first, but then it should steady.
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: March-21-2005 at 2:50pm |
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Double check the electrical connnections as well to make sure nothing is loose and everything is nice and tight. Also check the wire it's self and make sure it isn't craked or frayed near the terminal connection. Also look at the belt tension and double check it.
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mackwrench
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Joined: February-25-2005 Location: Gone Status: Offline Points: 190 |
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Posted: March-21-2005 at 5:53pm |
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I had this issue once... after the boat sat all winter, some rust deposits in the exhaust risers came loose and created a exhaust restriction causing the engine to overheat. If the hot water cannot get out of the engine no cool water gets in...... Just something to check but I would bet the farm it's the t-stat
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Ryan S.
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Joined: October-03-2004 Location: United States Status: Offline Points: 53 |
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Posted: March-22-2005 at 12:47pm |
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Hey guys. I think I've fixed the problem. Tell me if this sounds like a reasonable fix. Speaking with a few people, including a tech at SKIDIM, I checked for the O-ring in my sea strainer. It was there, BUT the strainer wasn't screwed on tightly. So, I prayed that a weak seal was letting air in, tightened the strainer bown down and put it in the water and the temp seemed to settle at its normal 160 degrees. I only had daylight to run it for a few minutes, but the temp didn't fluctuate at all from its normal spot. Would it matter how long I ran it? I got it up to temp and ran on a plane a couple of times and at idle. Thanks for all of the suggestions. If this really is the fix, I'm counting my blessings!
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Ryan
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mrese
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Joined: February-18-2004 Location: Al Status: Offline Points: 93 |
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Posted: March-22-2005 at 6:34pm |
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Sounds like a very reasonable fix. As long as you ran it long enough to get up to 160, I would think your Maintenance Operational Check is complete. Sign it off and enjoy your ability to fix it yourself.
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