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Old 02-17-2014, 12:38 PM
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143 or 160 Degree Thermostat?

1990 Indmar 351...

Which Thermostat should I be using, the 143 or the 160?

Also, is there an o-ring that goes around the thermostat, or is it just the gasket?
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Old 02-17-2014, 12:40 PM
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160. When you buy your replacement, it will come it with the necessary gasket, no o-ring.
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Old 02-17-2014, 12:41 PM
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Too "new" for me to have the answer. Anyone..........class, anyone?
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Old 02-17-2014, 12:51 PM
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Quote:
Originally Posted by hairlesshacker View Post
1990 Indmar 351...

Which Thermostat should I be using, the 143 or the 160?

Also, is there an o-ring that goes around the thermostat, or is it just the gasket?
160 deg F. Call DIM for the o-ring question. I am thinking yes but also thinking yes for the impeller housing cover. DIM will know right off the bat. I think it is a gasket.

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Old 02-17-2014, 01:10 PM
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I replaced my t-stat on my Tristar last Summer. IIRC, the t-stat package I ordered from Ski Dim contained both the gaskets and an o-ring. Mine only required one of the gaskets, I just matched the shape with the old one and away I went! Easy squeezey
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Old 02-17-2014, 01:24 PM
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Yesterday I ordered the 160 from DIM, and the triangular gasket that looks the right shape...
But then I got to second guessing whether or not there was an additional o-ring too when I took the old one out...
Guess I should have just called them to make sure it was the right thing... Will do that now...
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Old 02-17-2014, 02:56 PM
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Are you sure the 351W Fold in your Tristar is a 160? I'm pretty sure that the fords in these boats were 142's? My 1991 PS190 ford calls for a 142?
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Old 02-17-2014, 04:14 PM
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Yep...
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Old 02-17-2014, 04:17 PM
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hmm... interesting
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Old 02-19-2014, 12:45 AM
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I thought it was originally a 143, but they recommended a 160 as the replacement for raw water cooled...

DIM says "Older engines that had a 143 degree t-stat originally can use the 160 if you are running in fresh water (not salt or brackish). Engines run at 160 atomize fuel better than 143 and can provide some performance improvements."
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