25002500 Posted October 12, 2011 Share Posted October 12, 2011 Mack ch613 w/ e-7 350 hp coolant overheating/bubbling out of the overflow tankNever got over 170-175 deg on dash guageHelpAny ideasThanks in advance Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/ Share on other sites More sharing options...
shortstack Posted October 13, 2011 Share Posted October 13, 2011 Are you sure it is overheating? Maybe exhaust or air from air compressor getting into coolant system? Trey 1 Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-88317 Share on other sites More sharing options...
bts-4120 Posted October 13, 2011 Share Posted October 13, 2011 could be a bad gauge, but if its over heating plugged radiator loose belts thermostate sticking bad water pump or radiator, it could be several things Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-88324 Share on other sites More sharing options...
dirtywhiteboy Posted October 13, 2011 Share Posted October 13, 2011 could be compression from cylinder on a slightly blown head gasket! Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-88325 Share on other sites More sharing options...
Rob Posted October 13, 2011 Share Posted October 13, 2011 First thing to do is get a compression check on the engine performed. If low in any cylinder, remove the compressor cooling lines from the engine, and plug the holes. Recheck. If the readings are good, the problem is the compressor. If the check still presents the same problem(s), it is probably time to remove the head(s) for either a blown gasket, cracked liner, etc.Have you checked for engine blowby? With the engine idling, remove the oil fill cap and is there positive pressure, or slightly negative? Positive pressure is indicative of internal problems brewing in the rings, and or head gaskets also.I'd be willing to be you are looking at head gaskets. Don't do just one however cause the other will follow suit if you only replace the existing bad one, (if the case).Not a big or expensive job if you can perform the labor yourself but things are heavy.Rob 1 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-88338 Share on other sites More sharing options...
25002500 Posted October 25, 2011 Author Share Posted October 25, 2011 Rob you win the prize (again). Head gaskets are blown. Heads need reserfacing. Other wise no damage. Thank you to all who gave their thoughts Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-89430 Share on other sites More sharing options...
dirtywhiteboy Posted October 26, 2011 Share Posted October 26, 2011 glade you figured it out.... Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-89457 Share on other sites More sharing options...
25002500 Posted October 26, 2011 Author Share Posted October 26, 2011 Dirtywhiteboy. You were right on the money too. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-89469 Share on other sites More sharing options...
dirtywhiteboy Posted October 27, 2011 Share Posted October 27, 2011 how long is it gonna be down? fixing your self or in a shop? Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-89515 Share on other sites More sharing options...
25002500 Posted October 28, 2011 Author Share Posted October 28, 2011 Should be up by Monday. Sent the heads out to be magnafluxed and checked out Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-89600 Share on other sites More sharing options...
dirtywhiteboy Posted October 29, 2011 Share Posted October 29, 2011 sounds like a busy weekend!! hoping to get my regular truck back monday,...its been down a week for injectors and pump Quote Link to comment https://www.bigmacktrucks.com/topic/21024-coolant-overheating-at-170-degrees/#findComment-89628 Share on other sites More sharing options...
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