I thought I read 500 miles, but I cannot find where. The material below implies at 1000 miles. Certainly not in the first 100 miles.Title says it all. I know todays engines are brokin at the factory so your just seating trans clutches and diff gears. What mileage do they recommend before you tow anything?
I would advise reading the diesel supplement:
There is no break in period. There are specific things they request you to do, though, such as varying the throttle while towing.
I'm just quoting the instruction manualIf the factory wants you to drive a certain way... thats part of the breakin process. I forgot that diesel engines are not broke in at the factory due to the longer process.
Thanks for clearing it up. I want to tow an empty 18 foot open trailer home from picking up the oil burner. I can easily drive it 300 miles before I tow the trailer. Some vehicles want at least 500 to a 1000.I'm just quoting the instruction manual
"ENGINE BREAK-IN RECOMMENDATIONS
The diesel engine does not require a break-in period due
to its construction."
That is not to say there isn't a break in PROCESS. I find this explanation extremely lacking and would love to see more detail about this. I was just trying to provide you with the best available information.
Maybe you should read page 7 & 8 from the Diesel Supplement.I finally found this. From page 520 of the owners manual:...
I have. The diesel supplement is not contradicting the OM. Reaching "full efficiency" is further along than the first 500 miles. Note that the diesel supplement is addressing the engine. The OM is addressing engine, axles, and other components (such as transmission and transfer case).Maybe you should read page 7 & 8 from the Diesel Supplement.
My mechanical know how does not approach this level. We purchased a 6100 lb trailer prior to taking delivery of the EcoDiesel. It's sitting at the RV dealership 90 miles away via southern California freeways. I will have over 500 miles on the Jeep before driving up to bring it home late next week. I've been varying speed and letting the Jeep idle for a few moments after stopping. It would be difficult to pull over every 15 miles or so for the first segment of the trip back. Would appreciate advice, including the real risk to the long term health of the Jeep by traveling that 90 miles at about 55mph. Thank you.Guys you can search break in on ring and pinion and other gear types, cut and paste follows...
In order to make them run cooler and quieter, new gears are lapped at the factory. However, they are not lapped under the same pressures that driving creates. The loads generated while driving force any microscopic high spots on the gear teeth back into the surface of the metal. This is called "work hardening". Work hardening is similar to forging in the way that it compresses the metal molecules into a very compact and hard formation. This can only be accomplished if the metal surfaces are lubricated and the gear temperature stays cool enough that the molecular structure does not change. If the temperature of the metal gets hot enough to change the molecular structure, it will soften the surface instead of hardening it. The greatest damage to a new gear set results from running for ten minutes or more during the first 500 miles when the oil is very hot. Any heavy use or overloading while the oil is extremely hot will cause it to break down and allow irreversible damage to the ring & pinion.
Recommended procedure for breaking in new gears: After driving the first 15 to 20 miles, stop and let the differential cool before proceeding. Keep the vehicle at speeds below 60 mph for the first 100 miles. I also recommend putting at least 500 miles on the new gear set before heavy use or towing. During the first 45 miles of towing, it helps to go about 15 miles at a time before stopping to let the differential cool for 15 minutes before continuing. This is necessary because not all of the gear tooth is making contact until it is heavily loaded. When towing, the teeth flex to contact completely, and cause the previously unloaded portion of the teeth to touch and work harden. It is very easy to damage the ring & pinion by overloading before the teeth are broken-in.
...End cut and paste. While this tidbit applies to ring and pinions specifically much the same is true for most gear types. Overloading during the initial break in phase is not good for your gears, running extended break in periods does nothing. Once the gears have broke in they are broke in and no amount of directed break in procedures can change the gears from what you made them when they were actually in the break in period.
I'm an engineer but not the smart guys, think trains and boats, in my case boats. I have a lot of experience but its down in the dirt seeing the results of your actions (or lack thereof) experience. Break in is not something that you can get back with anything. Once you have failed to load a hard liner motor (many commercial diesels) failing to attain proper ring seal you cannot load it up after words and fix it. You have made an oil burner and must live with the results. Similarly if you over heat your gears you will at the least make yourself a whiner, how loud depends on how much damage you do. The gears will be weaker, how much weaker can only be proven out by breaking them.My mechanical know how does not approach this level. We purchased a 6100 lb trailer prior to taking delivery of the EcoDiesel. It's sitting at the RV dealership 90 miles away via southern California freeways. I will have over 500 miles on the Jeep before driving up to bring it home late next week. I've been varying speed and letting the Jeep idle for a few moments after stopping. It would be difficult to pull over every 15 miles or so for the first segment of the trip back. Would appreciate advice, including the real risk to the long term health of the Jeep by traveling that 90 miles at about 55mph. Thank you.
This always reminds me of a smoker saying that his uncle lived to be 100 so he isn't worried about smoking. Math doesn't lie however and smoking really does take years off your life on average.I have never broken in any of the diesels that I have purchased in the last decade Duramax, Mercedes or otherwise and I have towed pretty well the Max weight with most of them. I have also Spec many fleet vehicles including sprinters etc for businesses and none of these guys have ever waited to load them up and use them.