| Author | Message | ||
| joe padberg (Joemc7ab)
Registered Member Username: Joemc7ab Post Number: 489 Registered: 6-2004 Posted From: 66.38.159.33 Rating: N/A |
Would like to know the approximate lenght of time in hours or miles, when one can expect the piston rings to be seated for a two stroke 6v92. Joe. | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 481 Registered: 3-2006 Posted From: 216.198.139.38  Rating: N/A |
Joe I rebuilt an 8V71 years ago. It got to be some 4000 miles and still burning oil. I bought an overhaul kit of gaskets to pull it down and then before I got to it the oil burning quit. I had approx 6000 miles on it when it stopped. Hope this puts your mind at ease. Bill | ||
| Don Evans (Doninwa)
Registered Member Username: Doninwa Post Number: 292 Registered: 1-2007 Posted From: 208.81.157.234  Rating: N/A |
DA Book from DD for my 8V71 has a section in the back on break-in. Interesting reading. Fair amounts of time at various power levels up to full rated HP on the dyno. Even has info on expected oil consumption. If I was trying to rush the break-in I would look for the longest steepest climb around and run it as hard as possible as many times as my wallet would allow. Someday maybe I will have a new DD to break-in.  Good luck Don 4107 | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 1302 Registered: 11-2005 Posted From: 173.202.34.175  Rating: N/A |
Bill, What was the oil consumption when it was burning oil? | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 482 Registered: 3-2006 Posted From: 216.198.139.38 Rating: N/A |
Gus The oil consumption was about a gallon in 700 miles. There was no leaks so it was being burned. I know the old joke about 18 horsepower and 300 oil leaks but that wasn't the case here. I was amazed when all of a sudden it stopped burning oil. I would go to SC and return which is about 2000 miles and wouldn't add more then a couple of quarts. I checked the oil for fuel and there wasn't any so all of a sudden it wore in. Just took longer then I expected. Bill | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1365 Registered: 5-2001 Posted From: 67.139.65.163 Rating: N/A |
I have been told that it can take up to 30,000 miles to break in one of these Detroits. Ours took over 10,000 miles, and I got the impression that not being shy with the power had a lot to do with it. We had put new liners in a boat engine and we were having miserable luck with it until I talked to a couple of rebuilders. Both said that the rings would not seat properly if the engine was not run hard. This is a common complaint of generator sets that are not loaded heavily enough. One said to take the boat out and firewall it for a minimum of four hours. The other said that as soon as he put them together, he would run the hell out of them. Well, we went out and firewalled ours for four hours, and the symptoms disappeared. We got rid of hard starting, misfiring, and oil consumption, all in one shot. After break-in of our coach engine, our oil consumption was in the 500 to 600 mile range, which includes some leaks. Tom Caffrey PD4106-2576 Suncatcher Ketchikan, Alaska (Message edited by pvcces on April 05, 2011) | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 484 Registered: 3-2006 Posted From: 216.198.139.38 Rating: N/A |
I remember rebuilding a Cummins engine in a road grader a few years ago. The instructions that came with it was to start it, check for leaks and good oil pressure, than open the throttle to the governor for one hour. It just seemed to go against everthing I have learned over the years but it worked. Grader is still running strong and not using any oil. Bill | ||
| Brandon M (Brandon314159)
Registered Member Username: Brandon314159 Post Number: 11 Registered: 3-2011 Posted From: 70.89.177.137  Rating: N/A |
My dad was sent down to SF to inspect these 4 huge DD engines they were using for fire-water backup pumps for the city. Apparently they were freshly rebuilt, but smoked, used oil, and ran like crap! Turns out, they had about 200 hours of never being run hard. They put a nice solid water load on them and let them work at 95% load and low and behold...they're working great. Funny how that works. | ||
| Don Fairchild (Don_fairchild)
Registered Member Username: Don_fairchild Post Number: 51 Registered: 3-2007 Posted From: 108.79.234.17 Rating: N/A |
Detroit won't even look at a clam for oil use until you have at lest 18,000 miles on your engine. | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 2064 Registered: 10-2003 Posted From: 71.58.71.157  Rating: N/A |
Detroit diesel service manual in section 13.2.1 has a great deal of detail on run in on a dynamometer. Part of the main run in is at rated horsepower load @ governed speed for 30 or more minutes. There are charts for horsepower ratings for particular engines, and how long to run them. There is more than one part to the run in and time specified. The Grapevine in the west would probably work for on highway or Northeast extension of I-81 in the east. Might require a couple of passes, and NOT in hot weather; enough heat is being generated from rebuilt engine as is. I'd prefer a 45 degree day personally |