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Open Roads Forum  >  Class A Motorhomes

 > over heated & Broke down, update now in Flagstaff

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Living On

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Posted: 05/29/12 01:01pm Link  |  Print  |  Notify Moderator

MotorPro wrote:

racedaymechanic wrote:

Haulinas wrote:

Okay, 14 pages and no answer as to what caused the overheating? I'm with whoever suggested changing the inj's. I'd be checking that head for warp.

If you read the whole thread he says several times his plastic overflow tank cracked and he lost all his coolant
If you crack an overflow the only water you will loss is the overflow. That would not cause overheating. Something had to cause all the water to be pushed into the overflow tank(extreme high temp or high pressure from blown head gasket) more then likly the tank broke from the high pressure.


Correct on some vehicles.

* This post was edited 05/29/12 04:05pm by Living On *

mike4947

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Posted: 05/29/12 01:14pm Link  |  Print  |  Notify Moderator

Maybe I'm missing something as my experience with diesels is limited; but as I understand it the expansion/overflow tank is there to ensure the radiator and the rest of the cooling system is full and is designed to simply allow for the expansion of the coolant when it heats up. I far as I know there is no pressure in the expansion/overflow tank and it is open to the atmosphere. It's my understanding the raadiator cap controls the pressure and allows for the expansion/retraction of the coolant.
I can't remember ever seeing a tank without cold and hot fill lines on it. I have seen blown head gaskets pump out most of the coolant in a system, but it simply fills the tank and then pours out on the ground. No damage to the expansion tank itself.


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Posted: 05/29/12 02:24pm Link  |  Print  |  Notify Moderator

I have now owned 2 cars like this where the reservoir is part of the pressurized system. The radiator has no cap, and the cap on the tank is pressureized. If the tank cracks, the pressure is gone and what doesn't boil away leaks out. First time I saw this I thought it was odd but I guess it is more common than I thought.


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DonBaja

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Posted: 05/29/12 02:53pm Link  |  Print  |  Notify Moderator

To the best of my knowledge, on my older Monaco, the coolant constantly recirculates through the plastic reservoir so a leak there would empty the engine.

sjholt

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Posted: 05/29/12 01:31pm Link  |  Print  |  Notify Moderator

"I far as I know there is no pressure in the expansion/overflow tank and it is open to the atmosphere. It's my understanding the raadiator cap controls the pressure and allows for the expansion/retraction of the coolant."

On a 5.9B Cummins diesel there is no overflow tank like in a gas motorhome or a car.
The expansion tank in part of the cooling system and if it leaks- you loose all the coolant because there is no pressure in the system to contain it.
Yes, there is a 15 lb cap on the coolant tank to prevent boiling, but if the pressure in the system can no longer be contained- poof goes the motor as it will burn up real fast. To compound all this is that the motor, radiator is all in the back so you can't see it or smell it leaking.
HTH


Skip
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Posted: 05/29/12 01:55pm Link  |  Print  |  Notify Moderator

MotorPro wrote:

racedaymechanic wrote:

Haulinas wrote:

Okay, 14 pages and no answer as to what caused the overheating? I'm with whoever suggested changing the inj's. I'd be checking that head for warp.

If you read the whole thread he says several times his plastic overflow tank cracked and he lost all his coolant
If you crack an overflow the only water you will loss is the overflow. That would not cause overheating. Something had to cause all the water to be pushed into the overflow tank(extreme high temp or high pressure from blown head gasket) more then likly the tank broke from the high pressure.


This would be correct for most automobiles. On my Bluebird the coolant circulates through the reservoir continuously and I would think that many diesels are this way. Get a crack in the bottom of the tank and a lot of coolant will be lost quickly. Also the "radiator" cap is on the reservoir.

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Posted: 05/29/12 03:29pm Link  |  Print  |  Notify Moderator

MotorPro wrote:

If you crack an overflow the only water you will loss is the overflow. That would not cause overheating.
Virtually all engine radiators are pressurized which is the purpose of the radiator cap. Increasing the pressure increases the boiling temperature of the liquid.

So loss of coolant and pressure could indeed cause overheating.

My two Cummins both have bleed lines to the top of the overflow tank. The purpose is to bleed air from high spots in the engine. So a split tank would continue to receive coolant.


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Posted: 05/29/12 04:47pm Link  |  Print  |  Notify Moderator

C-Leigh Racing wrote:

Who would like to put a small bet, that once this engine is back together, running & Mr Wizard sent on his way, it wont be the end of the story.
Neil


I would not want to bet agaist that. Mr. Wizzard we wish nothing bad but I have been thru similar situations. I hope the shop can find the cause of why the engine overheated, this could be one of them gremlins that maynot show itself right away. I would ask them if they know why it overheated. It is obvious that piston was scored due to overheating. How many other pistons were scored? Looks like you have a few good ones in there too. Also, are you sure you have good/proper fuel in that RV. Bad fuel, improper air/fuel mix can cause these issues.





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Posted: 05/29/12 03:10pm Link  |  Print  |  Notify Moderator

If memory serves me right, I believe the 1964 Ford Galaxy was the first to have a rezzy tank for the cooling system, but it still had a radiator cap on the radiator.

Who would like to put a small bet, that once this engine is back together, running & Mr Wizard sent on his way, it wont be the end of the story.
Neil

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Posted: 05/29/12 03:38pm Link  |  Print  |  Notify Moderator

sjholt wrote:

"I far as I know there is no pressure in the expansion/overflow tank and it is open to the atmosphere. It's my understanding the raadiator cap controls the pressure and allows for the expansion/retraction of the coolant."

On a 5.9B Cummins diesel there is no overflow tank like in a gas motorhome or a car.
The expansion tank in part of the cooling system and if it leaks- you loose all the coolant because there is no pressure in the system to contain it.
Yes, there is a 15 lb cap on the coolant tank to prevent boiling, but if the pressure in the system can no longer be contained- poof goes the motor as it will burn up real fast. To compound all this is that the motor, radiator is all in the back so you can't see it or smell it leaking.
HTH



I have the same engine with rear radiator and it has a regular overflow tank no pressure. The radiator has a pressure cap. Something else caused the overheating and forced the pressure cap on radiator to release coolant which could have cracked the plastic tank.

Ken


95 Georgie Boy Encounter 37ft 5.9 cummins DP
01 Saturn SW


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