96 SN GT-40 Thermostat |
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2tall
Groupie Joined: November-10-2015 Location: MT Status: Offline Points: 47 |
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Posted: October-15-2016 at 5:05pm |
I discovered the thermostat on my 96 SN is probably the original. It was rusted and in bad shape, but miraculously still working. So my question is do I need to replace it with one that is exactly the same as the one I pulled out? Or can it be one from Napa autoparts that not "exactly" the same, but fits the engine and is 160 degrees. My mechanic friend says it doesn't matter as long as it fits and has the same temperature rating. See pics..First one is from Napa.....
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2tall
Groupie Joined: November-10-2015 Location: MT Status: Offline Points: 47 |
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I may have just solved my own issue. From what I can tell form some research is that the thermostat that was original (looks like a cup) is a "High Performance" "High Flow" thermostat. The other one I got form Napa appears to be just a regular thermostat?
Maybe someone can clarify for me.....I think I am going to take the thermostat back to Napa and just order the exact match of the one I took out... |
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2Tall - 1996 Ski Nautique GT-40
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3597 |
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I think I got mine from Nautique parts, a forum supporter. Had to wait a couple days but it works perfect.
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2tall
Groupie Joined: November-10-2015 Location: MT Status: Offline Points: 47 |
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I just did the same...ordered it from Nautiqueparts, $34 total for the thermostat, gasket and shipping. that is worth the peace of mind knowing I have exactly what was stock. Thanks!
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2Tall - 1996 Ski Nautique GT-40
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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I think you might want a 143 degree thermostat. Not sure, hopefully someone else will confirm which should be in your engine.
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'63 American Skier - '98 Sport Nautique
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3597 |
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The Fuel Injected GT 40 does use a 160.
My older Carbed 351 used the 140. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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JD,
Since the stat was still working, what was it that caused you to open up the housing to find the rusty stat? |
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Jonny Quest
Grand Poobah Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2859 |
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Pretty sure that the GT-40 is a 160 degree cooling system. JQ |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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2tall
Groupie Joined: November-10-2015 Location: MT Status: Offline Points: 47 |
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In answer to your question about why I checked it even though it was working:
1. I just got the boat last fall at the end of the year and I have been checking all kinds of things as I think of them, and I was winterizing and pulled the hoses and the housing. 2. I had a mastercraft that almost stopped running and I pulled the thermostat housing and the thermostat was so corroded it didn't even resemble a thermostat. It looked like a twisted rusted chunk of metal. So I always have that vision in the back of my mind. Btw: I am sure it is the 160 degree thermo for the efi gt40 it has run at 160 consistently all summer and I did a bunch of research on it too. Thanks everyone for chiming in. |
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2Tall - 1996 Ski Nautique GT-40
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Online Points: 13511 |
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A 160 thermostat will result in the engine running 170-175
A 142/143 thermostat will result in the engine running 155-160 Your mechanic friend is right in that a thermostat is a thermostat. If it fits it's right and simply choose the temperature you want. |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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I guess that's why I mentioned maybe 143, didn't mean to give bad information. My '98 with GT-40 runs 160 on the gauge and from prior reading here I knew that had to be a 143 stat. So, I don't know if my boat had the wrong stat when I bought it, or it's right, or what the story is. |
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'63 American Skier - '98 Sport Nautique
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Online Points: 13511 |
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I'd feel pretty safe running a 160 thermostat in a GT-40. Seems to be a mixed bag of user recommendations. Did they come factory with 143s? Those with heaters complained of poor heat output and I believe many users switched to 160 thermostats IIRC.
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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No idea. I installed a heater a couple of years ago and have good heat once the boat is warmed up, even at idle, even in colder water temps this time of year. So, I wouldn't change to a 160 for the heat. I guess my view is that a marine spec engine running 160 or 175 would have little difference in performance and wouldn't affect engine longevity, I'd be more concerned that the engine gets up to temp, holds a temp, and doesn't run more than a bit above that temp in all operating conditions.
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'63 American Skier - '98 Sport Nautique
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relake
Senior Member Joined: May-18-2016 Location: IN Status: Offline Points: 126 |
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Mine hovers right at 160+-, not quite sure if po changed it or not, but I'm assuming mine is a 143'er
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