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break-in rebuilt IH 806- use a dyno?

I

ironhoarder

Member
My 1963 International 806 will be coming back to me soon from having the engine (and rear end) rebuilt. My question is, what should I do about breaking in the engine? I suspect this subject has been beaten to death, so I apologize.

Anyway, I"ve read that Diesels like to see a pretty heavy load (after warm up) immediately after new rings, in order to provide enough cylinder pressure to seat the rings.

Some ideas I have for this- hook up to a 16" haybine and run around the field for 20 minutes. Or maybe a bush hog. Maybe in higher gear than I would normally use.

How about lugging the engine? Starting off on a hill in a pretty high gear?

Hey, I just realized that my neighbor has a PTO driven dynomometer. Maybe I should just hook up to that and load it down good for a while. Being a 95hp tractor, that should heat up that old dyno pretty good!

And I realize that after some amount of time, the head bolts need re-torqueing and the valve lash re-adjusted.
 
I hope the guys that did it know EXACTLY what they are doing. You might want to talk DIRECTLY ON THE PHONE to the tractorvet before you put it on a dyno. You sure as all heck don't want to stand and watch it all come apart in a bad way. 361 is a tricky motor to rebuild. If Any of mine ever need it, they are going with me on a trailer to the tractorvets shop for the job.
 
I would not lug any new engine. The components ned at least 10 hours of operation to become friendly with each other. A diesel has far more pressure in it than a gasser under all conditions. My way is to use that 10 hours in a flexible manor and as it gets to the 5 hour mark giving it some medium heavy loads, but never lugging. Change the oil at 10 hours and put it to work (no lugging, it is never a good idea for any normal purpose). Jim
 
The 361/407 engines are a good engine. Break it in lightly for the first few hours on the dyno, dont lug it hard. They arent that bad to overhaul either, alot of people are scared of them but I am not sure why. I have overhauled a few and did not see the difficulty.
 
The rebuilder is a long time IH fanatic and has done many. I've not yet heard his opinion on the break-in, I just thought I'd get info here first. I'll try to find tractorvets as well. Thanks!
 
Well IF the guy that rebuilt it really knows what he is doing and has hand fitted each piston to the bore and has checked for any wrinkling of the sleeves during the press in and he bored the block if it has not been done before and installed the oversized sleeves to correct the core shift that does happen to this engine over time . Then for break in the way i tell people is to use it on the spreader hauling manure for a day then change the oil check it over and do some other chore work . that is a little heavier . Change oil again at 30 hours and turn her lose . And at fifty hours re torque the head and reset the valves . JUST DO NOT LUG HER DOWN Past about 1700.
 
Lets just say that you got lucky . I do not count on luck when i am doing a job for a person that is paying me to do it wright and that is why they make tools to check things like bores that are out of round or that little wrinkle in that sleeve that happened while you were pressing it in that could cause a piston to seize and look for a way out . I have never had the desire to eat and engine job . bad enough when some outside problem causes and engine to go yuck yucko phewy after it has been running for several months after a rebuild as then you where the last one to have his fingers inside of it and it was your fault . You can do 10000 jobs perfect BUT let one little thing so south and everybody hears about it but nobody ever hears about the good jobs you have done, Am i a little over cautious , You can bet your sweat arres on that one.
 
I built a device to put in the cylinder to keep it from getting wrinkled. I am not lucky just good at what I do.
 
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