(12-25-2019 )Jrloar Wrote:  

(12-25-2019 )tree98 Wrote:  30K mile oil changes, 2.79 rears, and that auto $hitter lugging you down all the time, your engine is being greatly abused. You don't have to believe it but it's a fact.

I listen to everything that I hear. Like I say. I am a mechanic but not specifically Cummins. I came here because you guys run them. I haven’t. There is times I would take the word of drivers over a mechanic. How much does a mechanic drive the engines. And like stated. No load rev is totally different than pulling 80k up a 9% 2 mile grade. Sitting in neutral the engine makes no noise. However if the truck misses a gear and it revs to catch it again I can hear it. It is much snappier when the computer does the rev though

Air compressor? That’s possible I guess. I could unhook the air intake to the compressor and see if the Sound changes. I do have one problem, in my mind it’s valve train noise. So it’s hard for me to look someplace else. However I came here to get thoughts and advice. So I will try the air compressor.

(12-25-2019 )Jrloar Wrote:  

(12-25-2019 )tree98 Wrote:  30K mile oil changes, 2.79 rears, and that auto $hitter lugging you down all the time, your engine is being greatly abused. You don't have to believe it but it's a fact.

I listen to everything that I hear. Like I say. I am a mechanic but not specifically Cummins. I came here because you guys run them. I haven’t. There is times I would take the word of drivers over a mechanic. How much does a mechanic drive the engines. And like stated. No load rev is totally different than pulling 80k up a 9% 2 mile grade. Sitting in neutral the engine makes no noise. However if the truck misses a gear and it revs to catch it again I can hear it. It is much snappier when the computer does the rev though

Air compressor? That’s possible I guess. I could unhook the air intake to the compressor and see if the Sound changes. I do have one problem, in my mind it’s valve train noise. So it’s hard for me to look someplace else. However I came here to get thoughts and advice. So I will try the air compressor.

(12-25-2019 )Ricky Wrote:  

(12-25-2019 )Jrloar Wrote:  

(12-25-2019 )tree98 Wrote:  30K mile oil changes, 2.79 rears, and that auto $hitter lugging you down all the time, your engine is being greatly abused. You don't have to believe it but it's a fact.

I listen to everything that I hear. Like I say. I am a mechanic but not specifically Cummins. I came here because you guys run them. I haven’t. There is times I would take the word of drivers over a mechanic. How much does a mechanic drive the engines. And like stated. No load rev is totally different than pulling 80k up a 9% 2 mile grade. Sitting in neutral the engine makes no noise. However if the truck misses a gear and it revs to catch it again I can hear it. It is much snappier when the computer does the rev though

Air compressor? That’s possible I guess. I could unhook the air intake to the compressor and see if the Sound changes. I do have one problem, in my mind it’s valve train noise. So it’s hard for me to look someplace else. However I came here to get thoughts and advice. So I will try the air compressor.

I have a 08 ISX and I have to say sometimes my air compressor is so loud, like it's throwing a rod. It comes and goes, not just when pumping air. And it's really not that old, maybe three years. But it has gotten worse lately. Might put another on by summer. If it fails will it damage the engine???

(12-24-2019 )Jrloar Wrote:  Lots of questions. First, a little on my background. I am a double ASE master certified mechanic. However I will admit. I am in no may factory certified in any make. Just really good general non specific background

Not a driveline noise. Not tires. Not anything but from the engine. I did however get a video of it and in person it’s worse than the video shows. As far as maintenance on these trucks goes. If they ever needed anything it was replaced new. They are greased every 15k and oil every 30k. All full synthetic. They do overheads every 250k. Truck is at 299,850 miles at the moment and it is in as good of shape as new. centromatics on al 6 positions. Does not use but a quart of oil between changes. Not a drop of Coolant (Going by there records). Don’t build up access coolant pressure. Has what may be a very slight miss under heavy load. Fuel economy running 80 across TX from Del Rio to Joplin MO was 6.79 mpg. With 7k in a dry van Running tx 277 and I44. That’s in the vicinity of a 750 mile run.
Rear end gearing is 2.79

As far as manually shifting. Not that easy. I don’t know how much time you have in an auto. But if it don’t like what you want to do. It simply laughs at ya and does as it pleases any way. I can make it downshift only when it’s at a set RPM range. Otherwise it just beeps at ya. Then if it desires your RPMs are to high. It lets off the throttle for you. You truly have little control. And it’s not just this one. I know for a fact Paccar, Freightliner, and International work almost identical. I’ve ran all of those. Although the 12 speed in the FL works the best of the group. All the others including the one behind my X15 now are 10 speed.

Not sure what I missed. But I’ve been thinking. The overhead was ran about 30k ago according to the shop. I honestly think the screwed it up and set it wrong. They told me I’m the only one that has complained of noise like this and they have about 225 of the trucks. The lease 10 of them and the rest are company drivers. My thing is if I’m paying for the truck and “decide” to complete the lease then I don’t want a truck that hammered it’s self to death. Or I don’t want to pay for a catastrophic repair when I told them about the noise.

I made the fallowing video several hours ago while going threw Cumberland MD on I-68.

https://www.youtube.com/watch?v=kaaE5doQe2I&feature=youtu.be

I guess what I’m looking for is reassurance that what I hear is without and doubt a problem and me making them fix it would be justified Keep in mind I told them it had a noise the day after I got this unit. And I’ve only had it for three weeks now.

(12-24-2019 )Jrloar Wrote:  ...

oil every 30k. All full synthetic.

...

Rear end gearing is 2.79

Quote:If your average fuel mileage every 10,000 miles is ...

less than 5 MG -- Change your oil every 8,000 miles or so.

5 - 6 MPG -- Change your oil every 10,000 - 12,000 miles or so.

6 - 7 MPG -- Change your oil every 12,000 - 15,000 miles or so.

7 - 8 MPG -- Change your oil every 15,000 - 18,000 miles or so.

8 - 9 MPG -- Change your oil every 18,000 - 22,000 miles or so.

above 9 MPG -- Change your oil every 22,000 - 28,000 miles or so.

These recommendations are based on more than just engine wear alone. They are based on getting the most engine life vs the cost of oil changes themselves, and the fact that soot and other deposits are going to keep building up in your engine more rapidly than you can flush them out. A bypass oil filter system can extend this, but not by the claims they are making. You would be good to get an extra 8,000 - 10,000 miles on your oil before having to change it anyways. That is my experience on it, and is what I tell others that ask about these types of systems, etc.