chana1634 Posted October 5, 2017 Share Posted October 5, 2017 I have a 350 e7 engine, and I notice that I'm getting a lot of air pressure in the coolant tank, engine runs ok is not getting hot or anything like that, can the air compressor do this problem, and how to check it, I thank anyone for the help, Quote Link to comment Share on other sites More sharing options...
fiveseven0trkr Posted October 5, 2017 Share Posted October 5, 2017 Some pressure is normal I dont know what psi a e7 runs coolant at. My e6 has 7 psi when it warms up. If its more than it should be could be a blown head gasket Quote Link to comment Share on other sites More sharing options...
ranchhopper Posted October 5, 2017 Share Posted October 5, 2017 Yes the compressor can be the problem we just replaced one on the RD I drive at work because it was pressurizing the coolant tank. Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted October 5, 2017 Share Posted October 5, 2017 (edited) If you chase the compressor head you may want to pull it off, have it crack checked (magnafluxed, etc) at your local motor service shop and install with a new gasket. Great time to install an unloader reseal kit in head also. Edited October 5, 2017 by Mack Technician Quote Link to comment Share on other sites More sharing options...
chana1634 Posted October 30, 2017 Author Share Posted October 30, 2017 wll guys I disconnected the air compressor, from the water inlet and out,plug the block on the back and the hose that supply water to the head of the air compressor run the engine, for a few minutes, and still got pressure on the coolant, found that a head is crack, after pluging air compressor the olny this is the head or gasket, well found head is bad, thanks for all your imput. Quote Link to comment Share on other sites More sharing options...
chana1634 Posted November 19, 2017 Author Share Posted November 19, 2017 remove a head that machine shop said It was crack, replace the head and all gaskets, start engine and notice compression in the coolant, second day of work, pumpin diesel notice a lot of water leaking out, open hood, and water was coming from hoses, up on top, with a lot of pressure, and look like it busted my radiator too, that's how much compression was in the coolant, does any body know how to check for a crack liner, Quote Link to comment Share on other sites More sharing options...
hatcity Posted November 19, 2017 Share Posted November 19, 2017 9 minutes ago, chana1634 said: remove a head that machine shop said It was crack, replace the head and all gaskets, start engine and notice compression in the coolant, second day of work, pumpin diesel notice a lot of water leaking out, open hood, and water was coming from hoses, up on top, with a lot of pressure, and look like it busted my radiator too, that's how much compression was in the coolant, does any body know how to check for a crack liner, drop the oil pan, pressurize the cooling system, look up at all cylinders Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
Lmackattack Posted November 20, 2017 Share Posted November 20, 2017 Correct me if im wrong but the radator cap should release pressure above a set psi. Is the cap failing? Do these new trucks even have a cap on the radiator or is it just on the overflow tanks? Quote Link to comment Share on other sites More sharing options...
chana1634 Posted July 17, 2018 Author Share Posted July 17, 2018 it on the on the coolant tank or overflow, well at the end i found a crack on number one cylinder, had to replace one liner and one piston, some how a piston ring, scrach the liner all the way throw, cousing the compression getting in the coolant, 1 Quote Link to comment Share on other sites More sharing options...
Jamkar Posted July 17, 2018 Share Posted July 17, 2018 Thanks for the sharing your findings with us, 👍 Quote Link to comment Share on other sites More sharing options...
fjh Posted July 17, 2018 Share Posted July 17, 2018 Sounds like you may have a head gasket issue ! Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted July 17, 2018 Share Posted July 17, 2018 That’s a first, thanks for sharing results. Quote Link to comment Share on other sites More sharing options...
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