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Quick question. Have a 83 SN 351 PCM and temp pegs almost immediately. It has a 140 degree, can I just use one from auto parts store or have to get a OEM type??
Thanks
Thanks
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You should be able to get one at the auto parts store, but are you sure it is not a 160 degree thermostat?Ski on dude! -
Are you sure it is a thermostat issue and not an impeller issue?I own and operate Silver Cove Marine, which is an inboard boat restoration, service, and sales facility located in Mooresville, North Carolina. We specializes in Nautiques and Correct Crafts, and also provide general service for Nautiques fifteen years old and older.
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Has 140 stampedon it but I thought it was to be a 160 also.Originally posted by CHassmann View PostComment
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Well just replaced impeller and the thermostat must have been put in by PO.Originally posted by NautiqueJeff View PostComment
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The PCM carby engines were 140 degree thermostats. 160 degree for EFI engines. Won’t hurt to run a 160 (IMHO). I did.
JQComment
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Pull the thermostat out put it in a pot of water and turn on the heat see if it opens, that will tell you if you have to dig deeper.Comment
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A “pegged” gauge can indicate a bad sending unit or bad gauge.Comment
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Did you remove the RWP to replace the impeller? If so did you get it back in pointing in the right direction. Has happened to many and will not pump water to the engine reversed!1998 SN GT40
84 2001 Ski Nautique (sold)
Monticello MN.Comment
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I pulled Thermostat and did the hot water check and it is ok. Saturday gonna check RWP ,although I did put new impeller and it has been working ok.
I think as some said it's the sending unit or gauge. I'm gonna take the gauge out of my 79 just to be sure.
Thanks AllComment
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Use an Infra-Red temperature gun. That is the best way to verify temps. You can shoot the top of the thermostat housing and the intake manifold at the water inlet to verify temps.
MAKE SURE that your raw water pump is not installed upside-down. Happens to the best of us...(the voice of experience).
JQComment
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Ok
Thermostat- working
Impeller- working
Running at idle on trailer hoses from hose to thermostat housing to exhaust cold;hose going down from housing to block hot.
Does the water pump on engine do anything? Maybe that has gone bad???
SuggestionsComment
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Is the engine water pump leaking or squeaking? It's possible that the engine water pump is kaput and not circulating water throughout the engine. The raw water pump feeds water to the exhaust manifolds and to the engine water pump -- so if failing, you won't get proper cooling circulation.
JQComment
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Maybe it's an automotive pump and thus not bi directional if you have a right hand rotation engineComment
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