Breaking in overhauled engine

JDB · Sep 10, 2012

I have a Ford 7710 diesel with a fresh engine. It spent 9 hours on a disk mower Saturday. I plan to do some disking with it in a few weeks. My question is should I change the oil in it now or wait until after disking? It has less than 20 hours on the overhaul now with no oil change yet.

johndeere720diesel · Sep 10, 2012

I know when deere dealer rebuilt the neighbor's 4440 couple years ago I think they told home to do the oils change at 50hrs and to work it as hard as he could until then

MichiganMH · Sep 10, 2012

I am not following any prescribed procedure that I know of but I usually change the oil and filter after the engine has been run up to temperature and worked a few times on gas engines.

Anonymous-0 · Sep 10, 2012

Had a similar situation. Ran about 4 hours then changed it. Apparently worked well. Great power, doesn't use oil and little blowby.

buickanddeere · Sep 10, 2012

Rebuild or a set of rings, bearings, gaskets and a valve job?
Take it out and work it, don"t baby it.

cd1 · Sep 10, 2012

I'd change it.

what $50-$60 for a 5 gallon bucket of oil? How much did that overhaul cost?

M w J · Sep 10, 2012

Our 4440 had a john deere sticker put in the cab
and a gallon of breakin oil and it said to not
change the oil for a hundred hours then use 15/40
It never used any of the breakin oil.

mark in booville ny · Sep 10, 2012

im always recomended changing brake in oil at about 50hrs. depends how many hrs of disking your gonna do and yes work it hard and warm it up.

Haley · Sep 11, 2012

In my opinion you are doing the worst thing with it that you can do.I have been rebuilding engines gas and diesel for thirty years or more and the worst thing you can do especially on a diesel is baby it.You need to hook it to a plow that will get it up to a good working temp and keep it under a good load and hot for an extended period of time.Too many times I have seen people baby a rebuilt engine only to see it start slobbering oil out the exhaust because it hasnt got hot enough to seat the rings.We have even put cardboard in front of the radiator to get the temp up to normal.When I worked in the machine shop rebuilding diesel tractor engines we had a pto dyno that we run them in on.We would start them off at a light load just long enough to make sure everything was O.K. and then we would really load them up and let them run two hours or longer and never had a problem.

RodinNS · Sep 11, 2012

I'd probably change the oil after the first couple of hours of running to get as much crap out that's in there from after the rebuild. After that I'd run it for 50-100 hours then change it again.
I'd also make a point of keeping a good load on the engine... Don't let it idle or putz around doing nothing. The harder you work it for the first while the better off you'll be.

Rod

Breaking in overhauled engine

JDB

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johndeere720diesel

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MichiganMH

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Anonymous-0

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buickanddeere

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cd1

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M w J

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mark in booville ny

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Haley

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RodinNS

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