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Old 03-11-2012, 09:20 AM
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thinking head gaskets are ok

Hooked up gauge to degas bottle. from cold to warmed up got 5 to 6 psi. I did (4) 0-70 mph runs, slowly climbed to 9- 10 psi then started to drop a little. I released the pressure on degas bottle, then did 5 more runs, one pulling a steep river valley hill that I was at 90 mph before hitting the top of hill. the most pressure I seen was 4 psi. I did see 22 psi boost on most runs. I am going to do a river city egr delete, and replace oil cooler, thinking because of this test to replace head bolts with studs one at a time. The reason for test, I do loose some coolant from crack in degas bottle, and egr cooler hose is weeping, but every now and then get some coolant out of cap on degas bottle. That may be from getting a little to much in on refill. I do have a new degas bottle and cap on the way. So am I thinking correctly on the head gasket being ok, with this test?
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Old 03-11-2012, 09:46 AM
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Hard to confirm anything by pressures if you have leaks in the system. The main reason for 16 psi in the cooling system is to raise the boiling point of the coolant. It can easily boil and puke at 4 psi if the cap is bad. Retest once the cracked bottle is replaced.
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Old 03-11-2012, 09:52 AM
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ok will do
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