Another Coolant Pressure Question
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More Turbo
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Another Coolant Pressure Question
Is there a possibility on an egr deleted truck, but the egr is still in place with coolant passing through it, that the egr cooler can get clogged and cause pressure in the degas bottle?
Fleet Owner
Joined: Nov 2003
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The only ways I know of are 1) if it messes with the fan operation and that generally was on early model years IIRC, OR 2) if the vent hose is plugged (but I thought that that usually takes more heat than you would get if the exhaust gas flow path was blocked off).
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More Turbo
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It's done quite often. Weld a plug in the egr cooler, up pipe bypasses the egr cooler. I guess I didn't realize until recently that coolant was still going through it though.
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More Turbo
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Where is the vent hose?
More Turbo
Joined: Apr 2016
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From: Houston, Tx
Ahhh, I would call that an EGR block off.
Is the only path for the coolant to make a loop through the EGR? if not it should take the path of least resistance and eventually bypass the EGR completely as it clogs.
Is the only path for the coolant to make a loop through the EGR? if not it should take the path of least resistance and eventually bypass the EGR completely as it clogs.
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Token Redneck
Joined: Jun 2007
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From: Breckenridge, TX
I'm gonna say no, unless the welds are so shoddy they aren't stopping exhaust.
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Hotshot
Joined: Dec 2014
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From: Jersey Shore
I've never heard of an egr cooler getting clogged, only the oil cooler.
Is it possible that a poorly blocked EGR cooler with a small amount of exhaust gasses flowing through the cooler to overheat a reduced amount of coolant flowing through due to a clogged oil cooler to create a high pressure boil over? Well anything is possible.... but that a a pretty stacked set of events.
Is it possible that a poorly blocked EGR cooler with a small amount of exhaust gasses flowing through the cooler to overheat a reduced amount of coolant flowing through due to a clogged oil cooler to create a high pressure boil over? Well anything is possible.... but that a a pretty stacked set of events.
Logistics Pro
Joined: Mar 2013
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From: Kissimmee,Fla
A head gasket would take time to build pressure,it just wouldn't give pressure that fast. If it did, it would be a badly cracked head. My bet is the cheap EGR cooler delete. Either way it's going to have to come apart,sorry,I had to say it. I'd rather have to pull the intake than the heads.Test the EGR cooler with the one end plugged on the coolant side and air pressure to the other and put it under water. That will give you the true story.
Token Redneck
Joined: Jun 2007
Posts: 9,335
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From: Breckenridge, TX
Maybe if it's a freeze plug stealth delete? Those can burn through eventually. I just can't imagine someone putting an SS plug into the exhaust side of the EGR cooler and welding it so badly that it leaks enough in the 40-50psig range to register on a coolant pressure sending unit, after the EGR cooler blew after the delete.
Side note, even if the EGR cooler/Oil cooler loop was 100% clogged...... are the restrictions in the rest of the cooling system enough to build pressure? The water pump doesn't build pressure, the movement of the coolant through the smallest bottleneck would. If the water pump is sized to move coolant through the block and radiator with an open t-stat, I'm not buying that any clog in the coolant system could build pressure in the degas bottle at all. Even if the deareation line was removed coolant flow would push a gas bubble back to the pump and into the degas bottle. It has to be headgaskets or the EGR cooler, nothing else could produce pressure in the cooling system at the 18psi it's designed to run at.
Side note, even if the EGR cooler/Oil cooler loop was 100% clogged...... are the restrictions in the rest of the cooling system enough to build pressure? The water pump doesn't build pressure, the movement of the coolant through the smallest bottleneck would. If the water pump is sized to move coolant through the block and radiator with an open t-stat, I'm not buying that any clog in the coolant system could build pressure in the degas bottle at all. Even if the deareation line was removed coolant flow would push a gas bubble back to the pump and into the degas bottle. It has to be headgaskets or the EGR cooler, nothing else could produce pressure in the cooling system at the 18psi it's designed to run at.
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More Turbo
Joined: Mar 2016
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A head gasket would take time to build pressure,it just wouldn't give pressure that fast. If it did, it would be a badly cracked head. My bet is the cheap EGR cooler delete. Either way it's going to have to come apart,sorry,I had to say it. I'd rather have to pull the intake than the heads.Test the EGR cooler with the one end plugged on the coolant side and air pressure to the other and put it under water. That will give you the true story.
Laughing Gas
Joined: Jan 2007
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How much pressure are you seeing after releasing the warmup pressure?