Temp 180-230
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=2284
Printed Date: November-26-2024 at 8:29pm
Topic: Temp 180-230
Posted By: Bhedbloom
Subject: Temp 180-230
Date Posted: August-19-2005 at 7:32pm
My mustang is running hot. I read all the threads on "Running Hot" and have tried everything. New Thermostat 160 degree, New sending unit, New Impeller, Checked to make sure water flows freely through block. When at speed I am around 180 degrees: at idle it jumps to 200-230. I have run it in the driveway for an hour and it does not hurt the engine and is pumping water. The guage max. is 240.
Could the Guage be bad? How should I check? Should I blow out the Manifolds and if so how? It is Original Equip. 1970. Also The Holman Moody Conversion uses the Raw Water Pump to Circulate water through the engine as well as pick it up from the lake unlike many newer models. Any other suggestions? Thanks and Happy Boating!
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Barry, South Carolina
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Replies:
Posted By: pmt2234
Date Posted: August-20-2005 at 1:53pm
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I had the exact same symptoms when I installed my raw water impeller with its vanes flexed the wrong way.
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Posted By: Bhedbloom
Date Posted: August-21-2005 at 1:10pm
I have the vanes flexed back opposite the engine rotation. That was the way the old impeller came out. That is correct isn't it? Thanks!
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Barry, South Carolina
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Posted By: Jim_In_Houston
Date Posted: August-21-2005 at 3:45pm
The vanes in my raw water pump will "self correct" no matter which way you install them. I think they all will do so.
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Happy owner of a '66 and a '68 Mustang
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Posted By: 64 Skier
Date Posted: August-22-2005 at 5:52am
Sounds like your engine can't get the water out of the block and through the exhaust. I've seen flakes of rust restrict or plug the outlets. Do you have the Holman aluminum or carbon steel exhaust? May be time to send them to a paint or radiator shop and have the placed in a chemical vat.
Jim's correct about the vanes.
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64 Skier
66" HO VTX and 67" HO Triumph
http://www.correctcraftfan.com/diaries/details.asp?ID=1071&sort=&pagenum=3&yrstart=1971&yrend=1975 - 71CC
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Posted By: David F
Date Posted: August-22-2005 at 2:54pm
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Do the exhaust manifolds get so hot you cannot keep your hand on them? If so, the engine is running too hot. If not, then you should suspect the sending unit or gauge. Make sure the ground wires are making good contact.
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Posted By: Bhedbloom
Date Posted: August-22-2005 at 11:16pm
64 Skier,
I have the Holman Moody aluminum exhaust manifolds. Is one easier to clean than the other? What should I do next? Thanks!
David,
Yep, they get really hot. I can't touch them. The funny thing is that the impeller housing is cool. My Holman Moody enigine uses the raw water pump to ciculate the water through the engine (no circulation pump behind the raw water pump). Would that make a difference in the temp.? Thanks!
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Barry, South Carolina
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Posted By: 64 Skier
Date Posted: August-23-2005 at 4:00am
The carbon steel are more susceptible to rust flakes, but you still may have an old piece of rubber impellor plugging something up in the H&M's. If you pull an impellor that's shreaded...better expect small pieces in every small port.
If you can hook her up to a hose in the driveway, pull the impellor out and see if you can get water out the exhaust by just turning on the hose. If it flows freely out both sides then the exhaust is OK (not a definitive test but a start).
Do the same by pulling the thermostat and flush out the engine.
If you don;t have the hose connection, by 2 valves and a "t" with some short nipples with a hose connection on top and go to troubleshooting. I also use this to suck glycol out of a bucket and circulate w/o the thermostat for winter.
Take care of the H&M!
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64 Skier
66" HO VTX and 67" HO Triumph
http://www.correctcraftfan.com/diaries/details.asp?ID=1071&sort=&pagenum=3&yrstart=1971&yrend=1975 - 71CC
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Posted By: Bhedbloom
Date Posted: August-23-2005 at 3:11pm
64 Skier,
When I hook up and run the water minus the impeller to check the exhaust manifolds should I have the engine running or does it matter? Thanks!
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Barry, South Carolina
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Posted By: 64 Skier
Date Posted: August-24-2005 at 4:02am
No need to run the engine. The hoses allow the water to run continously through the exhaust. WHen running, and after the engine reaches temperature, the thermostat opens and allows even more water to run out the exhaust.
Have you pulled and inspected the fittings that are connected to the headers at the front of the exhaust logs?
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64 Skier
66" HO VTX and 67" HO Triumph
http://www.correctcraftfan.com/diaries/details.asp?ID=1071&sort=&pagenum=3&yrstart=1971&yrend=1975 - 71CC
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Posted By: Bhedbloom
Date Posted: August-25-2005 at 11:23pm
64 Skier,
No I have not pulled those fittings yet. I am going to start trouble shooting again tomorrow by hooking up the hose and seeing if water flows freely through the headers and elbows. If I find that it does not flow freely is it hard to take the exhaust elbows of the logs? It looks as if it is only a few bolts, but I have never done it before so I do not know what to expect on the inside. Also, I have shreaded impellers in the past and recently in this engine and I was told that they just wash through the engine and out the exhaust. Aren't the exaust logs and elbow designed to pass that material through? And if not, why? Thanks for all your help so far! I can't wait to get to the bottom of this!
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Barry, South Carolina
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Posted By: 64 Skier
Date Posted: August-28-2005 at 5:36am
The smallest ID is probably the inlet fittings and the first place to look for trash etc. Disconnecting the elbows is also easy and you can get a good look into the internals of the exhaust.
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64 Skier
66" HO VTX and 67" HO Triumph
http://www.correctcraftfan.com/diaries/details.asp?ID=1071&sort=&pagenum=3&yrstart=1971&yrend=1975 - 71CC
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Posted By: bhgran
Date Posted: September-02-2005 at 12:09am
Have you cleaned out the transmission cooler? My '73' Mustang has suffered a similar issues and I typically have to disconnect the input & output hoses so I can remove the pine needles and everything else it sucks up from the lake. I also found that using a "cup" style thermostat instead of an automobile type has helped.
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Bruce Gran
bhgran_ct@yahoo.com
Connecticut
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