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Combustion gases entering the cooling system

This is on a 2006 Series 60 14 liter. What different ways can combustion gases enter the cooling system without mixing any oil, antifreeze or fuel together?

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Sounds like a cracked cylinder liner to me. The gas is escaping the cylinder and going right into a coolant jacket. Pressure from the cylinder is greater so it pushes into the coolant jacket as opposed to the coolant into the cylinder. It's a thought anyway.

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My former employer had a S60 14 Litre that would literally blow the radiator hoses off if it was idled more than about 10 minutes. Turned out to be pin holes in the cylinder liner caused by electrolisis.

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Had an 07 Freightliner Century with a '06 Series 60 (no DPF, but had EGR).

My only problem like that came from a blown or internally broken EGR cooler, located just under and to the right of the turbo inlet. If you wait too long it will blow white coolant crud on the outside of the motor.

You didn't mention if this was the original unit, and how many miles the engine had on it.

Update

Have them check the EGR cooler.......the cooler takes a lot of heat, and the temps in there rise and fall quickly, could cause a crack internally.

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Well this is where the problem comes in its has 148,000 miles since in frame. I had switch to Evans Coolant a year before this problem started. It started building pressure in the cooling system and the Detroit Shop has been able to stop the problem yet. Its been 13 months since in frame and I know Detroit has a problem with their cylinder heads but 4 of them in 13 months is ridiculous. So I am wanting to hear some other ideas of how combustion gases would enter the cooling system. Every time I've checked for combustion gases in the cooling system there present so back to Detroit we go and they end up replacing a head I am getting tired of it and I am sure Detroit is to.

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Mel will be eternally grateful.
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