Zj transport Posted August 12, 2019 Share Posted August 12, 2019 hey guys...my 1st time doing a camshaft in one of these. I come from the much smaller automotive field lol.. my question is when doing the camshaft is it necessary to change all lifters and h rings or can just the broken stuff be swapped out? and can I leave the eup rollers alone or do they need attention as well somehow? its a 2001 rd688s w/ etech e7 350..thank you for your time and any advice Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted August 13, 2019 Share Posted August 13, 2019 Since it’s not a ceramic lifter cam I’d do all EUP and valve lifters. Mack doesn’t sell a kit, PAI does. Pay closer attention to the H ring on failed lifter that it’s mount depth has not changed from others or that it’s turned. You’d get a repeat failure. Quote Link to comment Share on other sites More sharing options...
Zj transport Posted August 13, 2019 Author Share Posted August 13, 2019 I was going to replace the h rings. do u think all is necessary or just the failed lifter? and im sorry forgive my ignorance but what is PAI lol Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted August 13, 2019 Share Posted August 13, 2019 PAI industries is an aftermarket for Mack. They own some of the Mack intellectual property rights and build to spec. They usually cost about 25-30% less, but not always. If you have the heads off it’s easy to check or replace H-Rings. Depth and alignment checking them is sufficient. If your feeling a little paranoid you could replace the H-ring on your failed hole. Also check condition of guide pins for the EUP rollers. Do you own an H-Ring installation tool? Quote Link to comment Share on other sites More sharing options...
Zj transport Posted August 14, 2019 Author Share Posted August 14, 2019 ahh ok good to know..i looked up the h ring tool and was gonna purchase it new around 400 ..I cant risk this happening again. Quote Link to comment Share on other sites More sharing options...
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