Over Heating?

[b.j.oneill]

OK, I am out of ideas guys maybe you can help. My truck is over heating it has a new fan clutch new thermostat and new water pump but still over heats when I get on it. EGTs stay normal and oil temp stays normal but the water temp gos way up and the heater starts to blow cold air untell I push in the clutch and raise the RPMs to about 2500 then the temp rapidly goes down what could be the problem. Thanks in advance for any help to my delima.

 

[HEMI®Dart]

How do the tubes look inside the radiator? Is there corrosion and built-up blocking the flow of coolant?



It could be air bound? But I doubt it

 

[b.j.oneill]

The fins don't look to bad but I'm going to try a flush tomarrow any way and put in disstilled water.

 

[Fish]

b. j. oneill

The gaskets on the thermostat comes apart and gets stuck in the flapper valve. Mine went the other way. The temperature never came off the bottom and the heater never put out at all. Fortunately it wasn't too cold at the time.



Warren

 

[TKemper]

Check the radiator cap. Had a friend with a 12v in his motorhome. It kept running hot, almost to the point of overheating. He had the rad flushed, changed the Tstat, but still did the same thing. Then changed the radiator cap and all was better.

 

[pathaymond]

I will second the radiator cap had a similar problem with a 93 I had was the cap. . good luck

 

[b.j.oneill]

I put a new rad cap on it first thing when I started having problems. Now this is the weird thing I just went and drove it it seems much more likley to get hot if the cruise is on I had it @ 55 it got hot I cooled it down and drove with out it at the same speed and it never got over 180. It got hot once today pulling my 32ft flatbed and two 3x3x8 bales of hay without the cruise but that is the only time i can think of that it has gotton hot without the cruise set now that I have started to think about it the rest of the times it has been on. Any ideas?

 

[D. Showan]

Kind of sounds like a head gasket. I'm not a diesel expert but I've seen some gas engines exibit those same symptoms with a blown head gasket.

 

[b.j.oneill]

I just put a new head gasket and resurfaced the head last month hadent driven it 500 mi since its been in the shop since the first of Jan on thing has go wrong after another.

 

[A Johnson]

It also sounds to me like a head gasket, Or crack in the head, especially the part of the heater blowing cold air. It sounds like air is getting induced into the cooling system.

As far as the radiator checks go you could also put a pressure gauge on the coolant intake elbow to the engine block ( I think you can Tap into it there) and run the engine. You should have a positive pressure at the coolant inlet. A negative pressure would tell you that there is a restriction in the radiator. Also make sure your lower radiator hose clamps are all tight as it can draw air in due to a venturi effect. As far as relating it to cruise control I don't know what the corallation would be.

Whatever you do don't run it without a T-stat as the hot coolant can then by pass the radiator and it will overheat.

Come to think of it you could also have a crack in the intake part of the cyl head putting turbo boost in the coolant.

 

[A Johnson]

Hey, no fair you beat me on your last reply

Did you have the same symptoms before the head gasket chang?

 

[b.j.oneill]

I pressure checked the engin first thing it held it perfect so I don't think it is in the head. The stupid thing ran fine before it just blew water everywhere never got hot or anything

 

[A Johnson]

I would check for a restriction in the radiator, or try flushing it as you said you were going to do.

I do remember a particular engine that had these symptoms and had the cyl head off three times before a cracked cylinder wall was found to be the culprit, and it was not very easy to see.

Good luck! AJJ

 

[b.j.oneill]

Thanks A I'm going to try it in the A. M. but I have a sneeking suspicion it may be in the head.

 

[Don M]

BJO,



Just a thought... sometimes the guys who resurface these diesel heads do a gasser type resurface on them. They tend to get them way too rough to make them seal properly.

I have been to several shops all around the D/FW area looking and asking for guys who know how to do the resurface the correct way. I was able to find only one shop to do it correctly.

The surface has to be very smooth. Not rough or cut with these Storm Vulcan machines. The Vulcan seems to cut the surface way too rough to get a good seal.



Reading through the thread here I tend to think it may be the head gasket leakin' on ya.



Last thoughts are... the head and deck surface have to very very clean prior to installing the head back on. Paying super careful attention and making sure the bolt holes are all cleaned out of the oil that is in them. If the oil is not removed from the holes prior to installation it can be pushed onto the deck surface when you begin to torque the head down. Causing early gasket failure. The outer bolt holes next to the exhasut side should have a tap run down them to cleanout all traces of rust and junk that seems to form in them at a minimum, I did them all for grins!



I cleaned my deck surface with a razor blade scraper for hours, then wiped the entire thing down with laquer thinner, then lightly sanded the entire deck with 400 wet/dry sandpaper, then went back with the laquer thinner again. I made sure everything was perfectly clean. Just like a new engine would be at the assembly plant.

I also checked to make sure the bolts were not stretched at all with the guide Cummins provided. Prior to torqueing the bolts I lightly coated them in oil to insure a good even torque. I do follow the manufacturers torque specs up to 89 lbs, but after that I take them to 120lbs instead of the extra 90 degree turn they call for.



Sorry to hear about the troubles with the gasket... been there before myself. Hope this helps!



Don~

 

[b.j.oneill]

Thanks Don can you PM me with the name of the shop in Df/W you spoke about mybe they can take a look at it and help me out i would really appriciate it



Thanks,

B. j.

 

[Don M]

The shop does not do any installation, but they will do the machine work the proper way. They dont have mechanics to diagnose stuff... . they do have very good machinst to resurface stuff, block work, etc. They have the Storm Vulcan, but they use it in a special way with special cutters along with another machine to get them right the first time.



Its a very large place. I have never seen machine shop this size in the private sector.



Trinity Castings

214-631-4248

ask for Dennis and tell them why. Tell Dennis he looked at a head for me about two months ago that he found to be perfect. He will remember.



Oh, take a ball bat with ya or maybe a shotgun... the neighborhood is about 10 times worse than the LA stuff you see on TV Well maybe not that bad, but be careful.



Let me know what ahppens in the end.



Don~

 

[illflem]

check this https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=36183

 

[Diesel Boy]

Suggestion to trace problem

Get your oil tested. Guy in my office had your problem with his van. Dealer pressure tested system no problems. However, oil test showed antifreeze in oil. In the end, small crack in head. Just a thought. Also, try replacing the thermostat. I put a new one in my car to cure high speed overheating. It was bad and caused overheating at 55mph. Same problem with old thermostat. Turns out that new ones were defective. Had to buy another brand.

 

[b.j.oneill]

Well heres an update I put a new T-stat in got it from the stealer since the last one was aftermarket and didn't seem to work flushed the radiator it so far I havent goten it over 180 thanks for all the help guys yall are the best!