Boats For Sale:
Overheating at idle and troll |
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8122pbrainard 
Grand Poobah 
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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 Posted: July-04-2016 at 4:01pm |
 Please explain further.
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BaccoBouncer
Senior Member 
Joined: April-25-2016 Location: Essex MA Status: Offline Points: 285 |
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Posted: July-04-2016 at 4:22pm |
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Yes that is what the new one is doing. There was not one in there when I pened it up which is why the temp didn't even register.
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'97 21' Sport Nautique
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tryathlete
Platinum Member 
Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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Posted: July-04-2016 at 4:26pm |
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My new one--same engine, replaced a month ago opens up and rises to 160 and stays there +/- 5-10F unless I run it hard and turn it off when the gauge rises to reflect the hot water left in the engine.
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john_33612
Groupie 
Joined: December-07-2011 Status: Offline Points: 45 |
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Posted: July-05-2016 at 10:40am |
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check under cam to see how much wear , if it runs cool with old impeller and over heats with new impeller ,it's the housing , new g21 housing is $150 , you can see some wear on this housing http://www.ebay.com/itm/Chrysler-Sherwood-Raw-Water-Pump-Impeller-Housing-G7-10615-OMC-V8-/141901619419?hash=item2109fee0db:g:gkgAAOSwe7BWvSIg&vxp=mtr
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BaccoBouncer
Senior Member
Joined: April-25-2016 Location: Essex MA Status: Offline Points: 285 |
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Posted: July-05-2016 at 10:54am |
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They sent me a Ford Impeller. I didn't need a calipers to measure the difference. I was just to green to notice it when I put it in.
 So what do I do about the temperature swing being so large? symptoms are runs up to 160 as expected. Then suddenly drops to 130 slowly rises back up drops |
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'97 21' Sport Nautique
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Hollywood
Moderator Group
Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13514 |
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Posted: July-05-2016 at 11:24am |
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New thermostat appears to be a bypass type so the large drop in temp is to be expected.
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BaccoBouncer
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Joined: April-25-2016 Location: Essex MA Status: Offline Points: 285 |
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Posted: July-05-2016 at 12:43pm |
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So is the large temp drop ok or creating stress on the system?
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'97 21' Sport Nautique
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Hollywood
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13514 |
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Posted: July-05-2016 at 12:57pm |
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it's not ideal but it's OK and unavoidable with the way the system was designed
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BaccoBouncer
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Joined: April-25-2016 Location: Essex MA Status: Offline Points: 285 |
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Posted: July-05-2016 at 1:22pm |
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ok thanks
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'97 21' Sport Nautique
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john_33612 wrote: