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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Blue devil don't work

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Author  [Modern View]

09-09-2012 20:33:31

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Probably crazy to mention given all you said you've done, but what about the thermostat? Without a thermostat in place, or with the thermostat stuck wide open, many engines will have enough flow going through the radiator to cause water to come out if the cap is off. Even if it's just stuck wide open the lack of restriction in the system will allow the water to flow too fast and not release enough ehat into the radiator and that alone will cause one to heat. So, if you haven't checked or changed it already I'd definately try that.

Anothetr thing to check on the older machines is the pressure regulator on the radiator. Look just to one side of the fill port for a round disc with several bolts in it. If you take it off there should be a spring, a disc, and another thin plate that acts as a seat under it. Make sure that everything is clean and free to move, that the disc and sealing surface are clean, etc, etc. Too make sure the sealing disc on the main radiator cap is good too so it seals. Without these items in place and working properly the radiator will not build any pressure internally, and, like a standard radiator without a pressure cap, it will not cool like it's supposed to.

I read your post below and the seal rings on the liners will allow coolant into the oil, but they have nothing to do with any kind of compression/ pressure getting into the cooling system. In other words the o-rings on the liners shouldn't be an issue unless you start seeing coolant in your oil.

Sounds like you've done and checked alot of stuff already, but those are a few things I would check first if called out to a customers machine, hope they help.

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Cat u9 u9

09-12-2012 05:26:11

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 Re: Blue devil don't work in reply to NCWayne, 09-09-2012 20:33:31  

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Fritz Maurer

09-09-2012 20:43:41

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 Re: Blue devil don't work in reply to NCWayne, 09-09-2012 20:33:31  
He also didn't mention the oil-soaked V-belts running in U-shaped grooves

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09-10-2012 13:37:04

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 Re: Blue devil don't work in reply to Fritz Maurer, 09-09-2012 20:43:41  
Yep, those can tend to cause a bit of overheating too. Funny thing, had a customer with a newer JD excavator that was having some heating issues last summer. He'd always call from a job in the middle of nowhere when it happened and ask what I thought the problem was. Tried troubeshooting over the phone having him check various things as he was trying to prevent having to prevent me coming so far to get to him ((((ie save money when things were really tight already)))). All of that really got no where, as you'd expect, but finally winter hit and the problem went away. It finally started on him this past summer and all but shut him down. I wasn't avaialble to go look at it at the time so he got someone local, who was recommended by someone at the job site, to come out. The machine had a serpentine belt on it and according to what I was told when the guy checked it, it was tight, and had never made any sound at all. The guy he called installed a new belt, blew out the radiator (something I had already had the guy do long ago) and the heating problem stopped.

I've never heard of a serpentine belt slipping enough to cause the fan or water pumpo to slow down and never make a sound. I have seen something similar on this same customers T190 Bobcat after he replaced two alternators and then brought it to me with a charging problem. Batteries checked OK, alternator checked OK, and the V belt driving the alternaor was tight and made no noise, but was a bit aged and cracked. Replaced the alternator belt and he's had no problems since. In the end the problem isn't always obvious and I guess you learn something new everyday.

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