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Posts posted by Mackpro

  1. The EGR valve for the 04 Emission MP7 only fits that particular engine and they only made it for one year so it’s a oddball part .  The part number you listed is a good part number for the kit that includes the valve , gaskets and clamps. The part number for the EGR valve by itself is 20784883. And of course no stock anywhere at the Mack part distribution centers or dealers . 

  2. Only the pre-CCRS /ASET engines used the off set can key . Not sure if it causes low power but I know in a 2000 RD bumped  from 400 to 460 will over heat in the summer . I know cause I did it . Lol.  Winter And spring we’re ok but the summer heat was to much ,  putting in the off set key way fixed the overheating. 

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  3. I don’t know exactly when the ceramic roller abs spring loaded push tubes were phased into actual production but they can be found in any ETECH engines out there as they can be used any ETECH out there, the ceramic rollers are quieter and if properly maintained they last longer than steel. But a spring loaded push tube must be used on the exhaust rollers as the .024” valve lash is to much  slack and turns a solid push tube into a jack hammer and shatters the ceramic roller over time. The .016 lash on the intake seems to cause no trouble. That’s why valve adjustment and updating the rocker arm hold down bolts are important. You can sill get the ceramic or steel rollers 

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  4. 57 minutes ago, KAYLA said:



    Neither . The ASET AC and AI  Engines did not start till sometime in mid to late 2003 for the 2004 model year.  A 2001 is also a confusing year. As that year you could have a regular Etech engine or a CCRS engine. And some parts between those two engines such as EUP’s, turbo , injectors camshaft won’t enter change with each other

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  5. There are  2 different cartridge style water pumps for the ASET engines , one for the AC engine and one for the AI engine. One has a 5.27 inch pulley and other has a 5.88 inch pulley, the wrong one can be easily installed and cause cooling issues. 

  6. The air line goes to a small solinoid mounted on a bracket on the far LH side of the fire wall under the hood. These solinoids are very prone to failure. So much so that we quit ordering trucks with air fan clutchs. 

  7. 1 hour ago, Tommy Mason said:

    I have a 1999 e-tech 350 with a bad cam and 3 lifter rollers that are flat. Looking up at the h ring on the lifers that failed, it looks like the h ring is turned a little bit causing the lifter to not be flat on the lobe as it should be. What is the procedure to replace the h ring? And how do you determine the proper place to set it in the block? It looks to me like it would take a special tool to set it the right height. 

    You have to pull the head, you drive them into the top of the block with a special tool .  I would pull both heads and check all H rings for height and alignment with the tool .     https://www.freedomracing.com/j-41683-a-h-ring-installation-tool-alt-st-271.html?___store=default&gclid=Cj0KCQjwyN-DBhCDARIsAFOELTkQYu8bovPFGcCPy2y3lwijWKKRUkv5vQDubzklDPSd8BvcFQuMN3kaAh8wEALw_wcB

  8. There are a couple of bulletins on this code. If a pre common rail MP8 engine , clear code and keep on trucking . If common rail engine then pressure test intake system , pay attention to charge air cooler/CAC for leaks . 

  9. Factory/dealership HP upgrades for MP8 should be fairly cheap. If you have a Mack transmission and truck is out of warranty. The dealer cost to go to 505 is usually around $200 , the dealership will usually mark that up 30% or $100 and charge 1 hour labor to install it . If the truck is still under warranty the the cost of the download is the difference between the cost of the factory engine versus cost of a 505 HP engine at time of purchase. Usually $1200-1400 plus markup and labor to install .  On some year models there is the 505 Plus download that has an extra 100 ft pounds of torque that you can get . You can’t get the 505 if you have a Fuller trans with a low torque rating or if you have a Allison transmission in a GU .  They do have a 505 E download that’s for trucks with smaller Fuller trans where you get the 505HP but not the bigger torque.  If a dealer is gonna charge $4-5000  for a factory upgrade, you need to find a new dealership. 

  10. On common rail engines, there is a electric fuel pressure solinoid on the end of the  fuel rail under the valve cover . It was a common problem and we had all ours replaced with a new updated part number solinoid and also harness.  It caused low fuel pressure problems and low power . There is a bulletin on this from Mack and is on both MP7 and MP8 engines 

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