I have been loosing coolant. About a half gallon a week. MXS C-15 Cat@550/1850 with a OPT overhaul in January this year and another head gasket and head in July. We've done an oil analysis through Cat(everything good). Checked the engine precooler(everything dry), the transmission cooler, put a puke jug on the overflow(nothing after 3 weeks of running), checked all hoses(Peterbilt says that was the problem, but no leaks), heater core, etc. What else are we missing. My gut says another head gasket or head. Peterbilt says it has to be an external leak, but leaving it in my shop with the heat off all week end= no leaks on the floor. All thoughts appreciated, I'm getting tired of having this thing tore down every six months!
Loosing coolant
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Nevs, Dec 20, 2011.
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Well, I would document complaint to last shop to tear it down. With only a half gallon a week; keep it full and close check till it shows itself. Consider the posibility it may have been partly air locked from last tear down?
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Possible being pushed out under pressure during driving too .But wont leak when idle .
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If all it's loosing is a half gallon, it's a small leak for as much as you drive. I think me only is correct. Possibly going out the stack if you have no visual signs. My guess is head or head gasket with a hairline crack.
I know they do smoke test on cars. Can't they do it on a diesel engine?Injun Thanks this. -
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if it was a head again you would loose all your water but what i am here is there is not leak so the head it not completely blown if you run it in a stressful scenerio like the mountains for a few days with a heavy load it should completely blow it and it should warranty
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