ou812jk Posted September 4, 2016 Share Posted September 4, 2016 have 2002 e7 400 drive down road temp fine shut off truck hear air in water manifold starts pushing antifreeze from top tank to bottom fills comes out vent hole changed cap twice changed air compresser removed thermostat upper hose removed filled up with antifreeze took off belt ran truck no bubbles shut truck off had bubbles not many start truck back up no bubbles shut off no bubbles start stop a couple of times then got bubble when I shut off ??? should have bubbles if it was head gasket or hole in liner Quote Link to comment https://www.bigmacktrucks.com/topic/46700-e7-400-head-gasket/ Share on other sites More sharing options...
fjh Posted September 4, 2016 Share Posted September 4, 2016 still can be a head gasket More common is low liner protrusion Liners need to be a minimum 24 thou ideal height is 26 . 28-30 max! Some engines came factory set a 22 which was spec at one time for lower hp engines Quote Link to comment https://www.bigmacktrucks.com/topic/46700-e7-400-head-gasket/#findComment-344554 Share on other sites More sharing options...
ou812jk Posted September 4, 2016 Author Share Posted September 4, 2016 was going to eliminate top tank and pressurize system see what that does Quote Link to comment https://www.bigmacktrucks.com/topic/46700-e7-400-head-gasket/#findComment-344561 Share on other sites More sharing options...
fjh Posted September 4, 2016 Share Posted September 4, 2016 If it's get worse under a pull its Likley head gasket we had one kept blowing the filter off low low liners caused it Quote Link to comment https://www.bigmacktrucks.com/topic/46700-e7-400-head-gasket/#findComment-344588 Share on other sites More sharing options...
fjh Posted September 4, 2016 Share Posted September 4, 2016 Take the stat out fill with water to the top of the tube belt off and couple of quick bursts of hard throttle should show it up! It will Worsen when warm Quote Link to comment https://www.bigmacktrucks.com/topic/46700-e7-400-head-gasket/#findComment-344589 Share on other sites More sharing options...
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