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Justus3
Canada
74 Posts |
 Posted - 08/20/2009 : 2:24:04 PM
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I just had a look at the owners manual for the Pleasure Craft 302 Fords. It indicates that the engines should run at 140-160 when cooled directly by seawater but 180-190 when cooled by a fresh water system.
I didn't realize there would be a difference. I do have fresh water cooling and run at around 180.
Ron
1978 Carver Santa Cruz 28
Vancouver Island BC
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Jimbo Song
238 Posts |
Posted - 08/20/2009 : 3:22:18 PM
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That's a new one on me. I have the mercruiser 230's (small block GM) with FWC and they run 140-150. 180-190 seems really hot to me but I am not familiar with the Ford engines.
Bob
1987 Carver Voyager 28
"Jimbo Song"
Palm Coast, FL |
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Bob On This
USA
175 Posts |
Posted - 08/20/2009 : 4:35:18 PM
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The fresh water cooling can run the higher temps because the coolant is pressurized and therefor will not boil at the 190 deg temps.
(the higher the pressure the higher the boiling point)
Just try to make coffee at 10,000 feet. The water will boil but it's not very hot at all.
The sea water cooled engine has basically zero pressure and the water will begin to boil, and will really mess with your engines.
Bob
Diver Down |
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Jimbo Song
238 Posts |
Posted - 08/20/2009 : 6:19:53 PM
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Yeah, I agree that they CAN run hotter with a closed system. But, I don't think they should. Just to make myself feel better I looked up the part number for the recommended thermostat and it is a 140 degree thermostat. My delimma is; "If the manual calls for 180-190 degrees why does the parts list call for a 140 degree thermostat?
Bob
quote:
Originally posted by Bob On This
The fresh water cooling can run the higher temps because the coolant is pressurized and therefor will not boil at the 190 deg temps.
(the higher the pressure the higher the boiling point)
Just try to make coffee at 10,000 feet. The water will boil but it's not very hot at all.
The sea water cooled engine has basically zero pressure and the water will begin to boil, and will really mess with your engines.
Bob
Diver Down
1987 Carver Voyager 28
"Jimbo Song"
Palm Coast, FL |
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Justus3
Canada
74 Posts |
Posted - 08/21/2009 : 7:57:28 PM
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I pulled out one of the Tstats and it is a 170.
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Justus3
Canada
74 Posts |
Posted - 08/21/2009 : 8:02:12 PM
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I took the old tstat (in its housing) to two marine supply stores and both said they have never seen anything like it and had no idea what the replacement would be. Does anyone have any suggestions for finding the correct replacement?
Ron
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Rockmeister
USA
307 Posts |
Posted - 08/22/2009 : 09:45:18 AM
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I agree with Jimbo here, the Fords like to run cooler.
You will find they last longer and make more power.
The 140 to 160 range usually works best.
If you have a closed & sealed cooling system you can get by with hotter, but is not necessarily a good thing.
Just being cooled by fresh water doesn't make it a closed system.
The problems of saltwater are lessened by freshwater, but not eliminated.
So as a general rule the Ford engines should be run cooler.
The thermostat is a standard sized automotive thermostat.
160 is about the lowest temp automotive one you will find easily.
Napa carries a 140 degree thermostat for a Merc that will fit right in perfectly also.
Hope this helps! 
quote:
Originally posted by Jimbo Song
Yeah, I agree that they CAN run hotter with a closed system. But, I don't think they should. Just to make myself feel better I looked up the part number for the recommended thermostat and it is a 140 degree thermostat. My delimma is; "If the manual calls for 180-190 degrees why does the parts list call for a 140 degree thermostat?
Bob
79 28' Mariner twin inboard V-drive.
Western Lake Erie: Maumee Bay & The Islands |
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Justus3
Canada
74 Posts |
Posted - 08/22/2009 : 1:41:10 PM
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I suspect my thermostat may not be all that standard. Can someone tell me how to post a picture of it.
Ron
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Rockmeister
USA
307 Posts |
Posted - 08/22/2009 : 5:58:02 PM
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Hey Ron!
You can goto www.tinypic.com
Create an account, it is free & easy to do.
Select Pic to upload.
Make sure to RESIZE the pic to message board size.
After pic is uploaded to tinypic, copy Message Board link and paste it to here, the pic will then show up.
Hope this helps!
Rock
I wanna see the thermostat! lol
quote:
Originally posted by Justus3
I suspect my thermostat may not be all that standard. Can someone tell me how to post a picture of it.
Ron
1978 Carver Santa Cruz 28
Vancouver Island BC
79 28' Mariner twin inboard V-drive.
Western Lake Erie: Maumee Bay & The Islands |
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Justus3
Canada
74 Posts |
Posted - 08/23/2009 : 5:28:58 PM
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OK - let's see if a picture appears:
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Justus3
Canada
74 Posts |
Posted - 08/23/2009 : 5:30:29 PM
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OOPs - too big - sorry
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Justus3
Canada
74 Posts |
Posted - 08/23/2009 : 5:36:52 PM
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I'll try another one
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Jimbo Song
238 Posts |
Posted - 08/24/2009 : 08:40:29 AM
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T-Stat readily available on www.iboats.com.
Bob
1987 Carver Voyager 28
"Jimbo Song"
Palm Coast, FL |
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Justus3
Canada
74 Posts |
Posted - 08/24/2009 : 1:25:16 PM
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I don't see it there Bob. If you can ID it I'd sure appreciate a part number or even a maker of the cooling kit. Thanks. Ron
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Jimbo Song
238 Posts |
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Justus3
Canada
74 Posts |
Posted - 08/24/2009 : 9:39:48 PM
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Much appreciated.
Ron
1978 Carver Santa Cruz 28
Vancouver Island BC |
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Topic |
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Engine temperatures
