2007 mack granite

[justincase]

So I know this has been brought up many times but im trying to understand the ceramic lifters in the mack aset. Truck started ticking and puffing out the air cleaner. Pulled valve cover and one rocker is way out of adjustment and nothing in the overhead looks out of place. I assume I have a broken lifter and would like to know the next plan of attack. I plan to pull oil pan and check for pieces but I am unsure of the actual procedure to replace lifters in this engine.  I also realize cam is likely damaged as well. I've combed the forums and have read the upgrades done to these engines and am willing to go that route as well. Manifolds, possibly cam with no extra bump and turbo but just need a direction to go in.  Thanks for any info.  Justin

[Joey Mack]

Pull the pan. You have too. I've done many if these.  Keep in touch. 

[justincase]

Will do. Thanks. My mechanic is well versed with cats and so im just trying to help the project along as best I can and if I need cam and lifters i figure i might as well do the suggested upgrades as well

[justincase]

So rainy morning afforded me time to pull pan. No ceramic pieces to be found.  I took both valve covers off and what I though was excessive valve clearance is now at 2 other rocker arms so maybe im not understanding valve clearance.   I will look closer at valves and have my mechanic take another look. Few codes I got at last startup were 2_8 2_9 3_6 8_3 8_1. These codes were after valve covers were pulled and engine brakes wires disconnected 

[justincase]

I also found one loose bolt that look to hold overhead in place. Not broken but very loose. 

[justincase]

Just read on the forum proper procedure for adjusting valves a didn't realize some rockers will be very loose on engine brake side. Gonna find a barring tool and start from scratch with valve adjustment and go from there

[Joey Mack]

I am glad you searched out the valve adjustment. DO NOT... run the valves using an overlap procedure like Cat or John Deere. You must do it the way Mack lays it out, and follow the firing order. Keep in mind that you set engine brake lash first at .045" and you leave the feeler in place to set the .024" exh. valve clearence. Intake is set to .016".  

[justincase]

Gotcha. Looking to borrow a manual and make sure im following correct sequence.   Thanks!