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Byron WC in SW Wi 
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Joined: 11 Sep 2009
Location: Wisconsin
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 Topic: why would a radiator hose blow up?
Posted: 29 Aug 2010 at 10:52am |
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It's between the radiator and the thermostat on my old CAT dozer. The first time it happened I thought it was the old hose. Now it just happened again. I took the thermostat off and it appears to be open, (engine was still warm). Temperature was around 250 which was which I think is in the green.
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 29655
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Posted: 29 Aug 2010 at 11:01am |
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Temperature had to be under 200 or it is burn't up, the hose will only blow out if the pressure cap isn't relieving and it over pressurized the cooling system Should be a 7 to 12 pound rated cap and any small garage can test it. If you have a blown head or head gasket that too can build pressure in the cooling system, if the cap checks good you could be in trouble.
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Byron WC in SW Wi
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Joined: 11 Sep 2009
Location: Wisconsin
Points: 1635
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Posted: 29 Aug 2010 at 11:33am |
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Cap is screw on with rubber seal I think. I'll have to check that. Thank you.
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Hurst
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Joined: 11 Sep 2009
Location: Midway, Ky
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Posted: 29 Aug 2010 at 11:44am |
I had the same thing happen to my 7000, got a new hose and it blew out the solder on the radiator tanks... Turned out to be the overflow hose was clogged. I put on a new cap, had the radiator checked, flushed the cooling system, and then finally I pulled the hose off to pull the radiator out again when I got the bright idea of checking it, and sure enough it had some glue or something down the hose that had clogged it. It was an old piece the radiator shop had put on it a while back when I had to get a split in the tank fixed.
Hurst
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1979 Allis Chalmers 7000
5800 Hours
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
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Posted: 29 Aug 2010 at 11:46am |
When you say old cat ? like waht year or model. If screw on cap there should be another pressure valve in system somewhere or it should be open system with overflow tube vented to air. (open line)
Temp should be 150 to 170 F , Check machine with engine running to see if you have bubbles or foam in radiator tank , sign of leaking head gasket . Also there are test kits to check for this condition.
Hoses fail but new hose should stand up to most pressures generated from expansion of air in system. Make sure fins are clean on radiator and proper air movement through area .
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Byron WC in SW Wi
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Joined: 11 Sep 2009
Location: Wisconsin
Points: 1635
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Posted: 29 Aug 2010 at 10:13pm |
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Thank you for the help.
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Gil of Wi
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Joined: 15 Sep 2009
Location: Prairie du Sac
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Posted: 29 Aug 2010 at 10:24pm |
They do have a separate relief valve. Normally on top of the radiator. A round cover about 3" in diameter and held on with 1/4" or 5/16" bolts. Could be head gasket but low liners will do it too. There good for that. Not sure what model ya have .
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"A man who makes no mistakes, dosen't usually make anything"
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
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Posted: 29 Aug 2010 at 11:26pm |
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Another thought, (this is why the side tanks on 08 up Ford diesels pop) if the thermostat goes from closed to open quickly, it can spike the pressure in the cooling system, and in the case of the Fords, the radiator tank seems to be the weak link. New redesigned thermostats ends that problem. Just because the thermostat is open when warm does not necessarily mean its good.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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D-17_Dave
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Joined: 11 Sep 2009
Location: Mocksville NC
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Posted: 30 Aug 2010 at 8:19am |
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If your operating temp is up around 250 you have major problems. A diesel will melt it's guts if ran much over that for any length of time.
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