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Zj transport

RD camshaft replacement

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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 

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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. 

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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

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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?

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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. 

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