Compression Ignition Addict
Join Date: Jun 2009
Location: Molalla, Oregon
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Yep! the coolant puking is not a good sign though. the best and most inexpensive way to test for small HG leak. you will need a few items.
A spare degas cap
a turkey baster
a 1/4" pipe to 3/16 barbed nipple fitting
a suitable length of 3/16 tubing, enough to get from the degas bottle, to inside the cab
a clear two liter soda jug
you want to pop the vent out of the spare cap, drill a hole in the center, thread the 1/4" end of the nipple into it, use tef tape, it will self tap into the plastic degas cap, install tubing or hose to nipple, take turkey baster and draw coolant down in degas bottle, note: might need to run vehicle with cap on, then allow coolant to expand after shutdown a couple of time-you want to have air space in the degas bottle for the test, best to have level below fill line, for expansion. then install spare cap, run tubing into cab-can usually close hood tight without pinching hose off. fill soda bottle half way with water, test drive truck. if truck is not overheating and there is consistant bubbling in the soda bottle, and it increases according to engine load and speed, I would be 99% satisfied you had cylinder compression leaking into the cooling system. this could be verified if you are not convinced, by installing a low pressure gage or pressure tester .in any case, I would address the EGR cooler with an upgrade or? Hope this helps!
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