hotter than normal running temp
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=4040
Printed Date: January-16-2025 at 2:36pm
Topic: hotter than normal running temp
Posted By: klockhart
Subject: hotter than normal running temp
Date Posted: July-03-2006 at 9:36am
I own a 1969 Mustang with Ford 302...I recently replaced the impellar and thermostat...and am still having a problem with over heating.... at idle the motor runs at 160 deg...When under a load( pulling a tube, skier) the temp increases to 240 deg which burries the needle on the gauge...When I back off to idle the temp returns to 160 fairly quickly..Any ideas as to why it still runs hot after replacing inpellar and thermostat will greatly be appreciated...Thanks..
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Mustang "69"
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Replies:
Posted By: Chill99
Date Posted: July-03-2006 at 10:49am
I've been working on a similar problem. Sounds like you may not be getting enough water flow. Could be some blockage in the water lines, maybe impeller parts from a previous impeller that broke apart? Also, could be caused by air leaks - check all hose clamps for tightness. Check the water strainer (i assume your boat has one) - make sure it has no cracks, the o-ring is good, and it's install back good and hand-tight.
Just some thoughts and ideas I've picked up from others and have tried myself.
FYI...there's a flow test you can perform which might be helpful. I picked this up from skidim.com - run a hose from the impeller pump to a 5 gallon bucket. It should fill the bucket in 15 seconds when the motor is running at 300 rpm. I did this and it was a nice task to prove the pump was pumping correctly. If you're doing this out of the water, make sure you have a good supply of water to run the motor at that high rpm for that long. I ran a hose from the raw water intake to a second 5 gallon bucket, filled 5 gallon bucket with water and stuck a water hose in it. When I did the test, the motor sucked that bucket almost dry in 15 seconds.
Good luck.
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Posted By: p/allen
Date Posted: July-03-2006 at 10:51am
Is your transmition cooler plugged? Did your old impeler have ears broken off ? If so , you will need to unplug cooler or take off hoses to to flush out the engine of broken pieces of impeler.
Pat
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Pat
http://i175.photobucket.com/albums/w146/72ccfan/100_5977-1.jpg - My 72 Skier
Rock River
Dixon,ILL.
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Posted By: Chill99
Date Posted: July-03-2006 at 10:51am
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Correction - that should be 3000 rpm (not 300).
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Posted By: Tim D
Date Posted: July-03-2006 at 12:34pm
If your motor has a circ pump on the block, pull it off, the blades/fins could be worn off which push the water. If your motor is going from 240 to 160 I can't believe you haven't blown a head gasket or cracked something.
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Tim D
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Posted By: dans
Date Posted: July-05-2006 at 3:27pm
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My boat was doing that when I first bought it & replaced the impeller. I thought I cleaned all the water lines out . At a fast speed old impeller fins were being pushed up to one spot making like a huge clog. I found around 15 big pieces in the main water hose that starts after the oil cooler.You really need to remove all the hoses and clean them out.Looking into then doesn't work cause there hard to see and most off them are in the middle when your not running. Little pieces were also found in my thermostat. My oil cooler also had a leaf or two in there .Definatly check all those areas and that long water hose. Let me know what you find . Dan
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Posted By: 1970 Mustang
Date Posted: July-05-2006 at 6:51pm
Yeah, 240 for much time is definately going to cause some serious problems.
Try taking off every hose in the cooling system and running water through them with a hose backwards, it may dislodge something which is positioned just right where it will not pass though.
If this doesn't change anything I would pop out all of the freeze plugs and see what is in the cooling jackets around the bottom of the motor. Sand and rust can accumulate there and really screw with cooling issues, and maybe some of the pieces from the old water pump.
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