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Ford 3000 overheating problem

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scott holt

07-26-2006 14:47:37




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I have a 1967 ford 3000 diesel that runs hot under load. I have replaced the radiator, water pump and temp sending unit. If the radiator is filled properly, coolent will come out of the overflow. The thermostat has been completely removed and the tractor's temp will still get all the way to the red on a hot day. Any ideas??




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bjr

07-28-2006 06:38:38




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 replace thermostat in reply to scott holt, 07-26-2006 14:47:37  
I'm in the crowd that thinks the cooling water bypasses the radiator if the thermostat is removed. This is true on many diesels. The thermostat is needed to block off the bypass circuit. bjr



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scott holt

07-28-2006 13:17:11




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 Re: replace thermostat in reply to bjr, 07-28-2006 06:38:38  
Thanks for the tip -- will replace thermostat and report back.
-SRH



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scott holt

07-27-2006 13:22:05




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 Re: Ford 3000 overheating problem in reply to scott holt, 07-26-2006 14:47:37  
I want to let everyone that replied that I appreciate the help. answers to some of the questions:
-I have 50/50 mix of prestone that just covers the core. If any more fluid is placed in the radiator it will expel it out of the overflow.
-In regards to air filter: i have changed the oil in the bottom of the filter but that is the extent of my cleaning.. I have a new air filter unit and I will install it this weekend to see if that helps!
-Drive belt is new, tight and not slipping. -I will likely attempt an engine flush as advised but when looking in radiator it appears that I have good flow.
-Because the tractor was expeling this coolent as it was I believed that maybe I had a blown head gasket. I ran test to confirm no cross contamination from cylinder in cooling system. I also do not have water in oil.

**again thanks for all of the advise so far**

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Jerry/MT

07-28-2006 12:06:17




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 Re: Ford 3000 overheating problem in reply to scott holt, 07-27-2006 13:22:05  
Scott, your comment on the head gasket jogged my memory. Sometimes a leaking head gasket has such a small leak that the high pressure combustion gases are expelled in the water jacket causing the coolant to have a lot of bubbles in it. The hole is so small and restricted that the coolant will not flow the other way and show up in the oil because the cooling system pressure is so low. Take the rad cap off, start the engine and look down into the radiator and see if you see a lot of bubbles. If you do, you may have the beginnings of a head gasket leak. Pull the head and check right away to save a lot of $'s and headaches later. having oil in the air filter cup is no guarantee that the filter media is not restricted. Only a thorough cleaning or a new filter will restore normal air flow. Measuring the delta pressure between ambient and just downstream of the filter can indicate a serious restriction but that's not usually an easy thing to do. My Ford 4610 has a delta P switch that causes a red light on the dash to indicate filter restriction.

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scott holt

07-28-2006 13:21:00




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 Re: Ford 3000 overheating problem in reply to Jerry/MT, 07-28-2006 12:06:17  
I ran a test made by blue point that is supposed to tell if there is a headgasket leak. It has some magic fluid and a tester that is supposed to be accurate.. the fluid changes color if compression is getting into the water jacket. I may need to run the test again/borrowed tester from local mechanic friend.. I did go ahead and replaced the entire air cleaner assembly last night but did not have a chance to run it after it was replaced. Thanks again -- please keep the ideas coming
-SRH

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Jerry/MT

07-28-2006 15:50:05




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 Re: Ford 3000 overheating problem in reply to scott holt, 07-28-2006 13:21:00  
When you start it up, have the rad cap off and just look into the top of the radiator. If you have a leak you'll see plenty of bubbles and there sahouldn't be any if there is no head gasket leak. My neighbor has a Ford 5000 that was pushing water out of the radiator cap. When I looked in there, there was a bunch of bubbles but he said there was no water in the oil. His temp gauge doesn't work so I couldn't tell whether it overheated under load BUT, the coolant was cold and it was still relieving itself when the cap was on, indicating a pressure build up that could only becoming from the combustion gases.
Hope this helps you.

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old

07-26-2006 20:51:16




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 Re: Ford 3000 overheating problem in reply to scott holt, 07-26-2006 14:47:37  
On some engines removeing the thermostat can cause them to run hot because the water never slows do enough to cool off. Also you could have a clogged engine block from rust and other crud and you may need to flush the cooling system. May self I flush them with vinagar cheaper then the auto parts store stuff and also works as good



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Chris IN

07-27-2006 06:23:16




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 Re: Ford 3000 overheating problem in reply to old, 07-26-2006 20:51:16  
My gas 4000SU runs hot also. How much vinegar do you use? Thanks



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old

07-27-2006 08:32:37




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 Re: Ford 3000 overheating problem in reply to Chris IN, 07-27-2006 06:23:16  
I fill the whole system with 100% vinagar and then run it a good bit or till it gets hot which ever come first. Then I let it cool off and flush the system out. I flush it by useing the block drain and an adaptor I made from pipe and a piece of hose.



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Jerry/MT

07-26-2006 18:06:18




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 Re: Ford 3000 overheating problem in reply to scott holt, 07-26-2006 14:47:37  
When you say that the radiator is filled properly do you mean that the water just covers the core? The rest of the space is expansion spacefor the hot coolant. Are you using the correct mixture of water and antifreeze (50/50)?

Make sure that your air filter is clean. On a diesel, the air filter restriction is more important than on a gas engine. Air Filter restriction on a diesel increases the Fuel/air ratio and causes the peak temperature to increase, eventually damaging the piston crown severly. It also limits power. On a pressure balanced carbureted sparek ignition engine, the only thing that happens is that the power output is reduced due to reduced airflow since the carb keeps the fuel/air ratio near constant.

Also make sure that the waterpump drive belt is not slipping.

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steveormary

07-27-2006 09:48:11




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 Re: Ford 3000 overheating problem in reply to Jerry/MT, 07-26-2006 18:06:18  
Scott;

You woulnt be trying to work it too hard. Does it heat up on light loads also,or just on a heavy load. Like plowing or bushhogging tall stuff.

steveormary



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scott holt

07-27-2006 13:06:40




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 Re: Ford 3000 overheating problem in reply to steveormary, 07-27-2006 09:48:11  
I used the tractor for clipping grass only. It is getting hot with 6' finish mower in low grass.. The temp guage is not pegging out but it is at the edge of the red on the gauge.



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JF in CT

07-27-2006 13:52:59




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 Re: Ford 3000 overheating problem in reply to scott holt, 07-27-2006 13:06:40  
Scott;
Have you confirmed the gauge is reading correct? Does it boil over? Possibly it is only a bad gauge.

Jim



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