12.7 Series 60- Issues after rebuild

Rubber is actually better at taming vibration vs poly in my experiences. I am not a fan at all of poly in engine mounts, carrier bearings or about 50% of suspension components.

 

Sounds like they didn't do the overhead adjustment correctly.

I had a guy do a Cat motor for me once. He was a supposed Cat guru. He put the rocker shafts on upside down (discovered by the Peterbilt dealer in Tacoma) Although it did run, it idled rough and the jakes didn't work.

 

From the sound of it. You chose the wrong people to do the job. Now you have to take it to someone else to get it running right. All the best to you.

 

Where’s the noise from? Exhaust? Sure the muffler is the same? Flow thru are louder. Any exhaust pipes hitting the frame or cab? Is the air filter in? Hopefully the cam timings not off a tooth. Maybe injector heights were set wrong? There’s a few different settings. I’d look for anything that was changed, or upgraded from original. Did they set the new injector codes Into the ecm? That supposedly only affects idle. Yet Detroit manual claims it can cause a lot more than idle problems. New motor mounts. Did they change the front motor mounts also? Any chance you forgot just how loud the engine actually is. Mines loud, compared to other engines. Mines still leaking at the front, hoping it’s just the valve cover. I’ve yet to do the first overhead. Hope it’s not a bad o ring, Lol. Did you check the y pipe, Things get disturbed during an overhaul. My check valve went bad, for instance. It was down 4 weeks. Still getting air bubbles in my tanks from return fuel. Occasionally it acts up and blows white smoke. It’s a separate problem, maybe caused from disturbed fuel lines, leaking shutoff valve, I have no idea. Even the best mechanics can make a mistake. I watched them put my valve cover on, yet it leaks. Not the first time. Another excellent mechanic once did my overhead and kinked the gasket. I had to re do it myself. It was nighttime and he was drunk, Lol. But things happen. Sorry to hear your having problems. Check for bubbles in fuel tanks, maybe it’s sucking air somewhere. The fuel pump guess work sounds suspicious. Maybe a fuel lines bad. They’re hard to prime, once it’s lost. Have to put air into tank, using a blow gun and a rag, to push fuel while cranking. I suggest changing oil, before 5k. Maybe 2 or 3k to get any metal shavings out. Might want to check fuel filters. May have some algae in the tanks from sitting.

 

I hate this for ya @JoeyJunk. Any check engine lights, smoke? Could the added noise and vibration be tge exhaust against the cab? Did they have the tranny out? Can you use a tire bar or something else and try to push the dampner toward the radiator to make sure the thrust washers are in place?

 

Possibly something with the flywheel. I would make d'amn sure that crank has no play too. I would have suspected timing, but they don't have much power usually if they're out, and you'd have black smoke