Re: Diesel engine break in

Posted by jdemaris on February 11, 2005 at 05:26:27 from (209.23.28.25):

In Reply to: Diesel engine break in posted by Northwest dude on February 10, 2005 at 21:15:42:

We used to put all our rebuilds on dynos for engine break-in except for log skidders and crawlers with winches or no PTO shafts. Since they could NOT be put on our dyno, we had a couple of long hills that we'd drive them on. Nice long gradual hill will give you a chance to control load versus RPM and watch engine temp at the same time. If you live in flat land, you're out of luck. Running the tractor in a high gear and working the throttle comes close though. With crawlers, we had a sandy field behind the shop which allowed running a crawler with a steady, controllable load with the blade down.
The main concern we had with break-in was piston ring line-up. I worked at several Deere dealerships, and we had problems with piston ring gaps lining up shortly after a rebuild. We never did a scientific study on the matter - but - could verify that rings were staggered when assembled, and lined up a few hundred engine hours later - sometimes causing oil consumption problems. This occurred with engines we rebuilt, and also new machines from Deere. Deere engineers suggested it might be a break-in problem related to harmonics. So, we got militant about giving every machine, at the least, a minimum two hour break in. More if it was on a dyno. It seemed to help. Also, with engines we rebuilt, all rings got staggered 180 degrees apart instead of 90 degrees. Hypothesis is, once break-in occurs, wear marks between the rings and cylinder wall created in the break-in process prevent the rings from walking around the pistons.

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