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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

D4C overheat problems

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Jeremy Brault C

07-25-2007 20:42:48




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Hi, I have an 89 D4C dozer that i use for my small excavation business. my question is does anyone have trouble with them getting warm? If you push it hard for only a little bit it climbs right to the red in the temp gauge but usually stays there. It has had a new radiator installed 800hrs ago, when the engine was overhauled. We also had to put a head gasket in it due to improper torque specs. I need some help the reason it was overhauled was because it burnt the rings outta it most likely due to it getting so hot. I was wondering could it be a worn water pump, or does it need more fan blades or what? any help or suggestions would be great. thanks in advance. Jeremy

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Greyt

08-21-2007 17:11:53




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-25-2007 20:42:48  
Are the transmission packs worn, and slipping, Have had experience with this problem with Case 1150 B. The transmission oil " burns ", and is quite black in colour.



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Don in Mich.

07-26-2007 15:06:51




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-25-2007 20:42:48  
Any bubbles in the radiator while temp is at or below normal with engine runing? Was the cylinder sleeve height checked after head gasket failure?Does radiator start to over flow while temp gauge is at normal



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Bob/Ont

07-26-2007 07:46:19




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-25-2007 20:42:48  
Jeremy, Who over hauled the engine??
Sounds to me the original problem was never dealt with, only dammaged parts changed. Take the small cover off of the fuel pump, turn the engine over in direction of rotation untill a 3/8" drill bit can be pushed into the timing pin hole(use chuck end of a new drill bit). Then see if a 3/8"NC bolt can be threaded into the timing hole in the flywheel and clearance felt in the #1 valves.
Later Bob

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SteveGr

07-26-2007 04:42:25




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-25-2007 20:42:48  
Check the water pump. It sounds as if the impeller has come loose. That does happen once in a while. The engine stays cool till you work it and once it overheats will not cool down. Just as you mentioned.



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AJK

07-26-2007 02:44:06




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-25-2007 20:42:48  
Was the cooling ok after the new rad and head gasket? or was it going into the red from day one after the repair,I ask this because 800hrs is plenty time for the rad to get choked up again,have you checked that the fan is pushing enough air through the rad,are all the fan blades intact,belt/s and pulleys in good condition,is the belly pans clean under the engine and transmission,is the TC temp in the normal range,I think you should have a Cat serviceman have a look at it for you,he will have a infra red temperature gun and will be able to determine how efficently the cooling system is working.
Good Luck
AJ

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Jeremy Brault Crookston M

07-26-2007 04:28:12




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 Re: D4C overheat problems in reply to AJK, 07-26-2007 02:44:06  
The belly guards are clean and we have washed the radiator out several times, as far as i was told the little thing has always gotten hot, so it is an on going problem. the fan is turning and blows plenty of air out the front of the machine. it appears that at one time it spit a fan blade cuz the shroud is chewed up. i just dont know anymore



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AJK

07-27-2007 15:10:11




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-26-2007 04:28:12  
Is the shroud in reasonable shape now and directing the air through the rad,have you a book and compare the fan,correct amount of blades and diameter etc,a machine that heats up like yours is a right SOB to suss out,with a heat gun you take a reading from the top of the rad and another from the bottom,there should be a considerable difference between the two readings if the rad and fan are doing their job as that is the only area where cooling takes place and it must be efficient,leave the thermostat out for a trial peroid and see how it goes.
AJ

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RAB

07-26-2007 00:18:00




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-25-2007 20:42:48  
3 comments.
1) You say 'to the red' -if it is still in normal operating range it is acceptable. Only when it enters the red would I worry (if the guage is accurate).
2) I would not trust a temperature guage without some alternative confirmation of the actual temperature. So measure the temperature with a proper thermometer. You may find it is still well in the acceptable working range.
3) Was the new rad to the same spec as the original? I have had rads with fewer rows of tubes installed than original. Not sure if the working spec was any different but may have been.
Regards, RAB

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john offenbacher

07-25-2007 21:04:44




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 Re: D4C overheat problems in reply to Jeremy Brault Crookston M, 07-25-2007 20:42:48  
exact same problem with my 850D. To date i have removed the thermostat, replaced the thermostat, flushed the radiator, put the old thermo back in, installed new radiatior caps and the only thing in return is that i"m an expert in tearing apart & putting back together again without leaks (5 times and only 20 minutes with a 10 metric wrench). any other ideas appreciated.
John



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135 Fan

07-25-2007 22:07:00




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 Re: D4C overheat problems in reply to john offenbacher, 07-25-2007 21:04:44  
Is there a way to positively bleed air from the cooling system? When I had my Cat engine done they said it's not a big problem on my engine but on D8H's it was common to crack the heads if the air wasn't properly and carefully bled. I'm not sure this would apply but thought I'd pass it on. Dave



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Bob/Ont

07-26-2007 07:38:52




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 Re: D4C overheat problems in reply to 135 Fan, 07-25-2007 22:07:00  
Take out any plug under the temp regulator, usually the temp sender and let coolant come out.
Later Bob



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