kdhconst Posted November 27, 2017 Share Posted November 27, 2017 I'm about to put in my 4th cam and lifters. E7 460 2000. Dump truck. What the Heck. 475,000 miles. First one was done - 300,000 miles, then 350,000 miles, 435. miles and now 475,000 miles all done by different shops. Any ideas? Quote Link to comment Share on other sites More sharing options...
fjh Posted November 27, 2017 Share Posted November 27, 2017 (edited) Could you please explain a little more ! Do you know if the the cam followers Are ceramic or metal? Earlier engines were equipped with steel rollers that eched the cams is this what is happening? or is it ceramic rollers that are breaking? If the symtom is a chirping sound it could be you have old style lifters and should upgrade to spring loaded push tubes and cearamic rollers Edited November 27, 2017 by fjh 1 Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted November 28, 2017 Share Posted November 28, 2017 I too would wonder if they are updating properly. Was it done in a Mack Dealership? 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted November 28, 2017 Share Posted November 28, 2017 Did they check the H ring height ? The hold and line up the roller lifter with the cam . If they have been damaged or moved due to past cam failures then the lifters won't last long. 2 Quote Link to comment Share on other sites More sharing options...
kdhconst Posted December 1, 2017 Author Share Posted December 1, 2017 It has metal rollers The last kit I got was all Mack. The roller becomes flat on one side. In each case the # 2 exhaust is the one that fails. I am wondering if the cam bore oil port is plugged. None of the work was done by Mack.. I have been told to be aware of the H ring height. I believe it has something to do with the lifter and above. Quote Link to comment Share on other sites More sharing options...
kdhconst Posted December 1, 2017 Author Share Posted December 1, 2017 The work has been done by 4 different shops Quote Link to comment Share on other sites More sharing options...
fjh Posted December 10, 2017 Share Posted December 10, 2017 As stated checking the h ring height is in order here also you might consider looking into the ceramic up grade! 1 Quote Link to comment Share on other sites More sharing options...
HeavyHaulinMac Posted December 12, 2017 Share Posted December 12, 2017 I'm No expert but it sounds to me like she ain't getting oil up there. Don't know how to test something like that eitherSent from my SM-G892A using Tapatalk Quote Link to comment Share on other sites More sharing options...
kdhconst Posted February 4, 2018 Author Share Posted February 4, 2018 Well after 2 months of off and on work on the cam the shop owner called and said come and get it. I live about 18 miles from the shop. before I got half way home it was popping through the breather. A excust valve was not opening. Called the shop. said he would come and tow it to his shop the next day. He showed up 2 days later and said it would be in his shop the next morning. I was told I had to be patient.12 days later I had enough. Called another tow service and had it taken to Mack. They found a broken bolt in a head. They checked Hring height and adjusted valves. All parts were supplied by Mack again . I have been told by others as heaveyHaulenMack stated that oil may not be getting to it. I was told that a oil journal feeds 1,2 and 3 another journal feeds 4,5,and 6. The journals go up #2 and #5 to feed oil to each. In my not so smart head if #2 isn't getting oil then #1 and 3 wouldn't be getting oil ether. No one has said anything to me about a ceramic upgrade as asked by fjh. So truck is homeafter 2 months. The shop owner says he put 76 hrs in what he did ???????? Previous shop charged 36 hrs to do the same thing. If it happens again I will put a reman from Mack in it. Thanks for the input guys! Quote Link to comment Share on other sites More sharing options...
terry Posted February 4, 2018 Share Posted February 4, 2018 what was done for 76 hours of labor? terry 1 Quote Link to comment Share on other sites More sharing options...
Popular Post david wild Posted February 4, 2018 Popular Post Share Posted February 4, 2018 Had to read manual on how open hood and work on a Mack 2 1 Quote Link to comment Share on other sites More sharing options...
kdhconst Posted February 4, 2018 Author Share Posted February 4, 2018 Changed the cam . He also checked the bearings on the crank. Quote Link to comment Share on other sites More sharing options...
terry Posted February 4, 2018 Share Posted February 4, 2018 sounds like way to much labor to me! terry 1 Quote Link to comment Share on other sites More sharing options...
kdhconst Posted February 4, 2018 Author Share Posted February 4, 2018 Agree Terry Quote Link to comment Share on other sites More sharing options...
steeler Posted February 6, 2018 Share Posted February 6, 2018 Wow. 76 hrs? 36 hours? What are you guys that work in a shop charging for a cam? We charge 24 hrs in a CV. Quote Link to comment Share on other sites More sharing options...
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