(02-18-2019 )NoTime Wrote:  I’m in process of rebuilding 2013 2350 due to carbon packing. The original engine number is 79672960 450hp. I want to rebuild it to a 79646458 which is a 600hp. Looking thru quickserve part numbers it looks like the piston and liners, cam, and injectors are the same but the head and turbo are different. I can understand the turbo being different but what’s up with the head being different?

I’ll take some picks if the intake side of the head for you guys. You literally can just barely make out the valve stems from the packed in carbon at 583,000. I don’t know how it was running. Lol

Yes replacing trans with a rebuilt 2050 18 speed. Just hope rear ends make it a while. Lol

(02-21-2019 )NoTime Wrote:  I’m putting on a new head as my mechanic said redoing the old one was waste of time and money. I wanted to redo the head because I have seen so many rebuilds lately with new OEM Cummins heads cracking shortly after the rebuild. I know 1 guy that has a logging company that lost 2 heads within a few weeks of there rebuilds but the were demandated while being rebuilt. My thought was if it’s got 580,000 it should be a head I don’t have to worry about cracking but I’m no pro mechanic so I’ll listen to mine.

As far as bumping up the hp we decided to do 565 1850 to not have to worry about the rest of the driveline. But I haul propane and sometimes a lot more than I’m supposed too and unfortunately we don’t have the time to ease along to try and save fuel. The best I ever got with the 450 is 5.1mpg hauling legal up in Michigan on flatlands. 90 percent of my running is the hills of WV and KY and it’s kind of disheartening when I get passed by coal trucks grossing twice what I am so it may use a little more fuel but as long as I keep getting $3.00 plus a mile I’m ok with that.

And the only thing different between a 450 and a 565 is the turbo. All internals, can, injectors are the same. If you want 605 2050 than you have to add a different head to the list. I figured 580,000 on stock turbo might as well buy a new one and get the bigger one which is the same price as a turbo for a 450.

I did get a bit upset today when they asked me if I wanted a new oil pump. I can’t believe a new Cummins kit doesn’t include a oil pump at these prices. But definitely not demandating anything for at least a year now!

And on the gear change thing I understand going from my 3.55 to a 3.90 would get you going faster from a dead stop but how does it really help on hills? Once you hit that hill and rpms start dropping how is the 3.90 going to be any better than say a 3.36?

(02-21-2019 )NoTime Wrote:  The bad demandate for the cracked heads makes more sense because all the guys having that trouble are coming from the same shop which is one of those mom and pop garages. Mine is at a Cummins shop only because it was the closest to stop and see why my engine was eating a gallon of oil every few hundred miles. I have tried to leave this engine bone stock since I have owned it and it didn’t by any means give me a terrible time but after seeing that head so carboned up and I change my oil every 15,000 I will not let this new rebuild do that again.

As for the gearing I’m definitely not saying your wrong but just like Moose’s example when I get tired I just drop gears. Ultimately more hp gets u up faster

(02-22-2019 )Magard Wrote:  ...
The engine is all marked up with white markings like a local repair
...

(02-22-2019 )Magard Wrote:  It has a rebuilt serial number and when I talk to local Cummins they say it’s theres by the serial number. It’s in quick serve with all the parts that we’re put in at the rebuild. I just dropped it. Demandated engine. I just took it as a $25000 education and moved on. I just want people to know that you can get really screwed thinking Cummins is reputable and there for there costumers. I will never by a Cummins reman agian that’s for sure. Far as motors go. We don’t have a lot of options. My machanic buddy that’s helping me with the rebuild says he’s been doing a lot of dd-15 right now. 5 or 6 hundred thousand they blow. Probably no matainance on bottom end and extended oil service.
I thought before all this if I bought Cummins reman it must be good. Built by the company that designed the motor. You would think that they would want to protect there reputation. Not.