ranchhopper Posted October 2, 2015 Share Posted October 2, 2015 I am going to freshen up the engine in the superliner I just bought so I called mack for engine upper and lower gasket set as usual the typical dead end the kid at CTI was able to give me some numbers though. Will the typical 673 engine gasket fit the ETAZB 673A engine in the truck I am planning on replacing the rod and main bearings and reringing the pistons there is barely a ridge on the top of the liners so they are not to bad. I was told the engine had burnt pistons so I pulled the heads and found a leaky head gasket that's why when the previous owner said it was smoking white I thought head gasket right away pistons were fine. It didn't have any antifreeze in it the previous owner had drained it to pull one of the heads so when I pulled the coolant filter and saw oil I was surprised there was some in the lower radiator hose when I checked so I will be taking the oil cooler from my 237 parts engine and installing it on this one to fix this problem. I found both the upper and lower sets fro PAI at less than half the price of mack gaskets but need to be sure they will fit before ordering them. Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted October 3, 2015 Share Posted October 3, 2015 different engine.Less head bolts in a 673 Quote glenn akers Link to comment Share on other sites More sharing options...
ranchhopper Posted October 4, 2015 Author Share Posted October 4, 2015 Had my friend come over from work yesterday he is our head mechanic at work and rebuilds all our mack engines said the engine needed new liners he has a liner puller so that's going to make things easier he says they are to scored to save. The pistons had a weird burn pattern on them he says the engine was way over fueled we are going to turn the pump down after the rebuild going to pull the rod bearing caps today hope better news comes from what I see there with the bearings. Quote Link to comment Share on other sites More sharing options...
ranchhopper Posted October 4, 2015 Author Share Posted October 4, 2015 Heres pics of the carnage Im in for lunch now I have #3 piston to pull yet the rest are out and sitting in the garage they look like they have been sandblasted those broken pieces are the piston itself between the rings the #6 liner came out when I pushed the piston out. The bearings don't look too bad the ones showing copper are the #1 and #2 rod bearings tomorrow after work Im going to pull some of the main caps and see how the bearings are there. Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted October 4, 2015 Share Posted October 4, 2015 Also check the timing. Quote glenn akers Link to comment Share on other sites More sharing options...
ranchhopper Posted October 4, 2015 Author Share Posted October 4, 2015 My mechanic friend says he thinks the truck needs to be flow timed. 1 Quote Link to comment Share on other sites More sharing options...
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