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T Stats
Today we fished in Long Island Sound everything was fine, on the way back in I came in from fishing @ 4400 rpm for about 20 minutes dropped down to 3000 rpm and the over heat alarm came on for 30 seconds as soon as I gave her some gas it shut off and never came on again. The guy in Outboard Exchange said it sounded like a T Stat hung up and said to change them. He sold me 2 and gaskets for 27. Is it as easy to change as he said it's like a car T Stat and does that sound like the problem? 1982 Merc 150
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1974 Wellcraft V-20 Center Console 1999 Mercury 150 HP Bluewater 1975 Wellcraft V-17 1977 Evinrude 70 HP Restoration Thread http://forums.iboats.com/showthread.php?t=404584 Enfield Connecticut Civil War Veterans Graves and History Pages http://enfieldwargraves.smugmug.com My companion book I authored http://www.blurb.com/books/1137672 Last edited by Blu_Lunch; 09-08-2009 at 02:10 PM. 
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#3
09-04-2009, 05:43 PM
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T Stats
I just removes them from the engine and they looked old and had white corrosion on them , dropped them in a pan on the stove and watched them open with a thermometer, they didn't open evenly, one was noticeably slower than the other, they started to open at 120 F and was fully open at 130 F. Closing one was smooth and the other just before shutting it snapped closed you could hear it. I 'll install them in the morning, what kind of sealer, Permatex #2 or silicone?
Water telltale is peeing out about 3 feet behind the engine, I don't think it's a water pump issue.
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1974 Wellcraft V-20 Center Console 1999 Mercury 150 HP Bluewater 1975 Wellcraft V-17 1977 Evinrude 70 HP Restoration Thread http://forums.iboats.com/showthread.php?t=404584 Enfield Connecticut Civil War Veterans Graves and History Pages http://enfieldwargraves.smugmug.com My companion book I authored http://www.blurb.com/books/1137672 Last edited by Blu_Lunch; 09-04-2009 at 05:48 PM. Reason: Additions
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#4
09-04-2009, 05:43 PM
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Working T-stats are a GOOD thing to have, those that block them open or bypass them will pay for it sooner or later and wish they would have put them back in. The factory doesn't spend money to put them in for nothing. Yes, T-stats in a V-6 MERC like yours are pretty easy and straight forward, just be careful not to break off the bolts as years of salt has a habit of welding them in.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#5
09-04-2009, 05:48 PM
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Most motors run like crap at idle speed or trolling if the Tstats have been removed.
If you haven't done the water pump in a while, also plan to do it while you got the motor down for repairs. I didn't remember using sealer when I replaced mine. Permatex has always been my favorite. Oh, don't forget the Anti Seize!
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 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny Last edited by tsubaki; 09-04-2009 at 06:00 PM.
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#6
09-04-2009, 06:21 PM
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ours runs great at idle and trolling speed so no probs there. And as far as paying for it eventually rob had an old 115 with bypassed stats and ran it for thousands of hours and had no problems.. so idk i just bypassed mine.
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1979 V-20 cuddy 1986 yamaha 200
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#7
09-04-2009, 08:58 PM
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On some of the newer and older ones with elec fuel injection and sensors the eng temp determined how much fuel was injected into the cyl's, without the t stats the computer may overload or not give the eng enough fuel into the cyl's and either burn the cyl's up and seize the motor or flood the rings and wash the cyl walls and you'll eventually loose compression sooner than expected by the manufacture's history for the motor. You may not get max hp out of the motor.
Just my 2 cents worth
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Tis better to be quiet and thought a fool than open your mouth and prove it!! 1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson  
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