nursecosmo wrote:
Unfortunately coolant certainly can make its way into the cylinder in turbo diesels. It happens on the intake stroke at low boost (such as slowing down and idling). The cooling system operates at pressures up 13 PSI or so, which can and does make its way past a blown head gasket. Where your physics comes into the picture is during the compression stroke, air will indeed be forced into the cooling system. The problem in identifying this issue in our KJs without a pressure tester is that we don't have a radiator cap, and the overflow tank is fed from the top and it is hard to see the inlet from the cap hole.
Yes right you both are (warp2diesel and nursecosmo) - however the air in the cooling system will gradually lose capability as the radiator will slowly fill with air instead of water. I tried this on my nissan patrol 2.8 a few years ago. Can't recommend it.
While the nissan did have a cap on the radiator to let out overpressure to an expansion tank, most of my cooling fluid went that way suddenly. And the engine nearly overheated within 1 km (had been warmed up on a trip before, then diagnosed at idle with a plastic bottle filled with water with the hose going to the expansion tank put into the bottle, bubbles of air and green coolant, yes plenty!).
Didn't notice anything odd with the exhaust while this went on, only the coolant spilling over the road.
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