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bigmackattack

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Posts posted by bigmackattack

  1. Sometimes when I encounter a Cummins or Mercedes powered truck I do a "RollingTest" because that is the best way so see exactly what the true load smoke is, and 99 percent of the time they fall right into the Jersey spec without even trying. Much of the problem with the "snap Test" is the fact that some engines need more than the 10 seconds between snaps to stabilize

  2. CAM ROLLER! You have a cam job to do my friend!

    you changed the compressor ? then it sounds like you thought the sound was near that area,Likly one of #no 3or4 cam rollers has failed. pull the pan and look as 68 has said!

    Pulled the compressor out to look at the aux shaft for end play or bearing noise, found that the compressor was leaking, customer asked for it to be replaced. The noise is in that area and we are going to drop the pan. :thumb:
  3. Hey In my experence the cam would make a "popping" sound not a "chirp". You might wanna check air comp. or (sounds silly) head gasket or head bolts, I have herd them do it under load. GOOD LUCK!

    Replaced the air compressor today. Noise is still there.

    What about the oil pump? That's about between cyl 3 and 4.......noise is very resonated and hard to pin point

  4. I work in a shop where we pretty much work on everything that drives or gets towed in. My Mack experience is limited, I mostly handle medium duty trucks,buses . We have an 01 RD triaxle ,E7 300HP.

    Towed in with engine noise. The engine is quiet until it reaches operating temp, then it begins to generate this heavy chirping sound from the center of the right side of the block.

    Using a "sonic ear" we determined the noise to be coming from cyl 3 unit pump.

    When we torn it down we found cyl 1, 3 , and 6 that the unit pumps lost their spring keepers. We replaced all the unit pumps at customers request. Noise Still There.

    This chirp resonates through everything. You can hear it in the Air compressor, the turbo

    and center of the block!

    Has anyone come across something like this?

    I thought it could be an intermediate shaft bearing, my gut feeling is that perhaps the cam shaft bearings are failing(spinning in the block)

    Any suggestions would be welcomed. Thankyou, Russ

  5. Comic Sans MS"]Had a big ice storm 5 years ago, LOst power for 4 days. If not for the wood stove and the small portable generator life would have been tough with the 20 degree days. Technology has it's place, but we all should know how to survive without it

  6. Hi everyone! My name is Russell and I have been enjoying this site for months. Many great photos and tons of great advice and info. Although I am a 25 year veteran master auto tech, I have been working in a Truck shop for the last 2 1/2 years and really enjoy working on trucks. Recently began formal training on trucks and attended many diesel engine traning sessons, even got power stroke certified..(big laugh right). Just took my CDL driving test today! (failed :angry: ) I goofed the air brake part. I look forward to gaining more incite from all of you and maybe by accident I might be able to give some incite back. Thank you in advance for a great site!

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