topo Posted December 15, 2020 Share Posted December 15, 2020 I was planning on adding a coolant heater to my Mack 673 by removing the large round port above the starter I made a tool by cutting a large washer and welding it to a socket to get a good fit but it won't unscrew so them I may go with a tank style heater . any thoughts ? Quote Link to comment https://www.bigmacktrucks.com/topic/65261-block-heater/ Share on other sites More sharing options...
Freightrain Posted December 15, 2020 Share Posted December 15, 2020 It will take some light heat to get those plugs out after all the years. Pretty sure there is an o-ring behind it as a seal. Or was it just a gasket? I had to remove my heater due to changing to spin on filter head and there wasn't room for the block heater. Mine was in the middle on the driver's side of block. Once I cut up the original fitting for the heater I was able to clean up the threads and install a factory style plug. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/65261-block-heater/#findComment-465488 Share on other sites More sharing options...
topo Posted December 15, 2020 Author Share Posted December 15, 2020 Thank you I will just leave it alone it may have never been taken out . Quote Link to comment https://www.bigmacktrucks.com/topic/65261-block-heater/#findComment-465492 Share on other sites More sharing options...
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