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Overheating Issues

Old Nov 3, 2007 | 01:05 PM
  #1  
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hollenjoe
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Overheating Issues

Hi, I have a 351m 8.6 scr with a mild cam, 4v intake and a 750 edelbrock carb and open headers, the rest is stock but new except for pistons and crank (they are in perfect state and the crank has been regrounded), after 30 minutes of running the temp goes to 110 degrees celcius and water starts to boil, the radiator is stock but new (4 rows) and the water pump has been tested,
what could cause this ?
 
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Old Nov 3, 2007 | 07:38 PM
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Originally Posted by hollenjoe
Hi, I have a 351m 8.6 scr with a mild cam, 4v intake and a 750 edelbrock carb and open headers, the rest is stock but new except for pistons and crank (they are in perfect state and the crank has been regrounded), after 30 minutes of running the temp goes to 110 degrees celcius and water starts to boil, the radiator is stock but new (4 rows) and the water pump has been tested,
what could cause this ?
What kind of running do you do for the 30 minutes?
If it is 30 minutes of idling, then you need a good fan and fan shroud.
If it is a new build and you are breaking it in, then overheating will occur due to friction. You should get some large fans to blow cool air on the radiator during a break-in period.
 
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Old Nov 4, 2007 | 10:27 AM
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hmm , yes the block had all kinds of jobs done on it, so that could be it, Ill try the electric fans on the radiator and see what happens, thanx
 
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Old Nov 27, 2007 | 08:34 PM
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I had a similar problem when I started running my rebuilt 351M this summer. I needed a new fan clutch...
 
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Old Dec 8, 2007 | 04:20 PM
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I am having the same exact problem with a freshly rebuilt 351M. I thought that I may have the incorrect thermostat and that's not it. Engine warms up to running temperature and then all heck breaks loose. The coolant must be starting to boil and continues to do so even after I shut it off. You can actually see the heater hoses shaking and you can hear a "popping" noise that sounds like an old boiler. Could the fan clutch be causing this? What about if the heater hoses were connected to the wrong fitting??? Any help would be greatly appreciated.


Thanks,

James
 
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Old Dec 8, 2007 | 05:27 PM
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Originally Posted by JCoggin
I am having the same exact problem with a freshly rebuilt 351M. I thought that I may have the incorrect thermostat and that's not it. Engine warms up to running temperature and then all heck breaks loose. The coolant must be starting to boil and continues to do so even after I shut it off. You can actually see the heater hoses shaking and you can hear a "popping" noise that sounds like an old boiler. Could the fan clutch be causing this? What about if the heater hoses were connected to the wrong fitting??? Any help would be greatly appreciated.


Thanks,

James
I just fixed it, I guess it being a new build, cylinder walls tend to have to much friction causing the overheating, anyways, I moved the radiator as close to the fan As I could, got a bigger fanshroud, added an extra electric fan infront of my raidator, and got special 0 freeze anti-coolant, temperature went from 110 degrees to 80 degrees and at extreme conditions 90,(degrees celcius)

so all good, except I messed up and broke the bottle containig the hydraulic liquid of the steering system, f·"$k..... It emptied up in the middle of the road, messy sh&t and ended up driving several miles with a bod of smoke and a hard-*** steering wheel- ....
 
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