BIGYELLOWTRUCK Posted August 17, 2011 Share Posted August 17, 2011 I have a GU713 dump truck that has a coolent leak, it will go though about 2 gallons a week, It's been to the dealer and no luck. we have changed the coolent jug, No leak on ground, oil samples A-OK ??? Quote Link to comment Share on other sites More sharing options...
rhasler Posted August 17, 2011 Share Posted August 17, 2011 What engine is in your GU? It could be either an MP7 or MP8. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
BIGYELLOWTRUCK Posted August 17, 2011 Author Share Posted August 17, 2011 MP7 Quote Link to comment Share on other sites More sharing options...
rhasler Posted August 18, 2011 Share Posted August 18, 2011 If you can't find any visible signs of coolant leakage it could be an internally leaking EGR cooler. My guess if you don't have any other performance related symptoms is that it is blowing out of the overflow on the radiator reservoir. The drain line for the overflow hangs down by the left steer axle spring. When coolant is forced out of the reservoir through the line it can catch air and blow away, so you won't always notice a leak there. There is a check valve type arrangement that can be added to help prevent this from happening. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
MasterTech Posted September 2, 2011 Share Posted September 2, 2011 The first place I would look if there's no external leaks is the egr cooler, we have had a lot of issues with them on the MP series engines. Take the exhaust outlet hose loose (on the pass.side near the front of the egr cooler) and check for coolant inside. Quote Link to comment Share on other sites More sharing options...
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