jordan ebanks Posted December 30, 2010 Share Posted December 30, 2010 i'v been having some problems with the oil cooler on my 1974 dm600 mack dump truck.The problems i'v been having is that oil has been escaping from the oil cooler and entering the radiator.i am puzzled as to what it could be that the core of the oil cooler as a leak or is it the O rings in the actual oil cooler that has gone bad.The engine is a 237 hp mack engine Quote Link to comment https://www.bigmacktrucks.com/topic/17057-oil-cooler/ Share on other sites More sharing options...
Rob Posted December 30, 2010 Share Posted December 30, 2010 i'v been having some problems with the oil cooler on my 1974 dm600 mack dump truck.The problems i'v been having is that oil has been escaping from the oil cooler and entering the radiator.i am puzzled as to what it could be that the core of the oil cooler as a leak or is it the O rings in the actual oil cooler that has gone bad.The engine is a 237 hp mack engineRemove the oil cooler from the engine and replace the "O" rings and end gaskets to the unit. Common to leak on older engines with age. The kits are about $15.00 from PAI.Rob 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/17057-oil-cooler/#findComment-69403 Share on other sites More sharing options...
usgasser Posted January 7, 2011 Share Posted January 7, 2011 i'v been having some problems with the oil cooler on my 1974 dm600 mack dump truck.The problems i'v been having is that oil has been escaping from the oil cooler and entering the radiator.i am puzzled as to what it could be that the core of the oil cooler as a leak or is it the O rings in the actual oil cooler that has gone bad.The engine is a 237 hp mack engineWe are having a similar problem with our 1992 MH Mack! It has a 400hp E7 engine and is leaking oil into the radiator. We have replaced all O rings and seals in the oil cooler and pressured tested. The problem still remains. Has Rob or anyone else had this same experience or know what the problem might be? Quote Link to comment https://www.bigmacktrucks.com/topic/17057-oil-cooler/#findComment-69904 Share on other sites More sharing options...
Rob Posted January 7, 2011 Share Posted January 7, 2011 We are having a similar problem with our 1992 MH Mack! It has a 400hp E7 engine and is leaking oil into the radiator. We have replaced all O rings and seals in the oil cooler and pressured tested. The problem still remains. Has Rob or anyone else had this same experience or know what the problem might be?Sorry but I have no experience with an E7 series of engine at all. Oil in the radiator could be a blown head gasket internally. The engine oil pressure is much higher than the cooling system pressure. Also a cracked liner, (if wet sleeve engine) or a bad liner seal could cause the same thing. A bad turbocharger coolant seal could also be suspect.Apologies as I can't be more specific.Rob 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/17057-oil-cooler/#findComment-69913 Share on other sites More sharing options...
rhasler Posted January 7, 2011 Share Posted January 7, 2011 We are having a similar problem with our 1992 MH Mack! It has a 400hp E7 engine and is leaking oil into the radiator. We have replaced all O rings and seals in the oil cooler and pressured tested. The problem still remains. Has Rob or anyone else had this same experience or know what the problem might be?If your truck has a water cooled transmission cooler it might be leaking there. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/17057-oil-cooler/#findComment-69915 Share on other sites More sharing options...
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