Boats For Sale:
Temp 180-230 |
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Bhedbloom 
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Joined: December-01-2004 Location: United States Status: Offline Points: 116 |
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 Topic: Temp 180-230Posted: August-19-2005 at 7:32pm |
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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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pmt2234
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Joined: June-14-2005 Location: United States Status: Offline Points: 46 |
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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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Bhedbloom
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Posted: August-21-2005 at 1:10pm |
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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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Jim_In_Houston
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Joined: September-06-2004 Location: United States Status: Offline Points: 1120 |
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Posted: August-21-2005 at 3:45pm |
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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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64 Skier
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Joined: February-08-2004 Location: United States Status: Offline Points: 415 |
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Posted: August-22-2005 at 5:52am |
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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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David F
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Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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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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Bhedbloom
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Posted: August-22-2005 at 11:16pm |
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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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64 Skier
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Posted: August-23-2005 at 4:00am |
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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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Bhedbloom
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Posted: August-23-2005 at 3:11pm |
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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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64 Skier
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Posted: August-24-2005 at 4:02am |
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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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Bhedbloom
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Posted: August-25-2005 at 11:23pm |
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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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64 Skier
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Posted: August-28-2005 at 5:36am |
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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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bhgran
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Joined: August-28-2005 Location: United States Status: Offline Points: 21 |
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Posted: September-02-2005 at 12:09am |
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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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