85 mack Posted June 28, 2020 Share Posted June 28, 2020 Just drained the engine oil on my Mack e6 350 motor. There was some antifreeze in it, not much. The truck is a 1985 RS688LS . It has 105000 miles on it and 4600 hrs. Any ideas on where it might be coming from and if so how hard is the fix? Quote Link to comment Share on other sites More sharing options...
terry Posted June 28, 2020 Share Posted June 28, 2020 Head gasket, oil cooler, cracked head/block, air compressor, you have to start eliminating things. terry Quote Link to comment Share on other sites More sharing options...
85 mack Posted June 28, 2020 Author Share Posted June 28, 2020 Thanks Terry. How can water get in the oil at the air compressor? Quote Link to comment Share on other sites More sharing options...
terry Posted June 29, 2020 Share Posted June 29, 2020 40 minutes ago, 85 mack said: Thanks Terry. How can water get in the oil at the air compressor? It is oil lubricated and water cooled. terry Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted June 29, 2020 Share Posted June 29, 2020 pull the pan and put pressure on coolant 1 1 Quote glenn akers Link to comment Share on other sites More sharing options...
fjh Posted June 29, 2020 Share Posted June 29, 2020 3 hours ago, theakerstwo said: pull the pan and put pressure on coolant Dito Quote Link to comment Share on other sites More sharing options...
staxx Posted June 30, 2020 Share Posted June 30, 2020 Pull valve cover and check core plugs , prone to leak with age , they are the 1/2 square plugs under valve cover . If they are. The issue it will be visible , just drain coolant down some remove and clean install pipe thread compound and reinstall , or could be one of many other issues . Start with easy stuff first Quote Link to comment Share on other sites More sharing options...
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