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Ford 9N, 2N & 8N Discussion Forum
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Break in time

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Rocket

02-24-2005 17:43:56




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Im in the process of having a 9N motor redone. It has all new pistons, rings, sleeves, bearings, valves, valve seats, etc... How should I go about breaking the motor in and how long is the break in time?




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Rocket

02-28-2005 18:18:46




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
Thanks guys.



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willie j

02-25-2005 06:31:01




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
Just an observation, of course older gas engines are a bit different from diesels. Drove for a major bus line several years. Detroit 71 series. Head machinist would set up his rebuilds on a test stand. Warm up at fast idle, check for leaks & strange noises. Then open them up, run wide open, no load about a minute. If nothing flew apart would say"It's a good one, install & drive it." Most would start to use a little oil at 800,000 miles, next tear down at 1,000,000. In over 25 years,had 1 come apart, injector stuck. Last truck outfit I drove for. Cummins 14 liter. New units from factory in Va. Drive one, tow 3 saddle mount. Assign to driver, hook up a full load & go. Starting with '98models change oil at 40,000 miles. Personally had to add 1 gal oil between changes. Trade off at 500,000 miles, no known engine failures. Your mileage may be different.
Willie J

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Hobo,NC

02-25-2005 04:57:29




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
I run’em in the shop for 30 min. above idle make sure it gits up to operating temp. no leaks good oil pressure timing set then go out and run it for 15 min go threw all gears at all engine speeds do not run at full throttle long then run in fourth gear at full throttle and decelerate back to idle 10 times. Once I git up to ‘bout full speed I knock the throttle down to idle and cost down to ‘bout idle in gear this loads the rings to help’em seat. I then let it run for ‘bout 15 min adj my idle recheck all systems. No hard work for the first hour after this then put it to work. Change oil after 10 hours.

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mattd

02-24-2005 18:36:20




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
the most important thing is to warm the engine up to full operating temp and keep it there before it does any kind of work. usually on old tractors i rebuild, i put in break in oil from john deere. if your tractor is going to be a "trailer queen" warm up and run about 60%-70% of power. vary them rpms. and change oil and filter after first 10 hours. but if its going to be a every day working tractor do the same thing except put it under about 80%-90% load.

matt

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HOOKER

02-24-2005 18:34:44




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
i ran mine at a constant speed a little above half throttle pulling a box blade spreading some gravel (didn't load the tractor down)



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Rocket

02-24-2005 17:58:48




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
Another question here. How should I run the tractor. Should I vary the speed or keep it constant



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Dave H (NY)

02-25-2005 03:51:15




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 Re: Break in time in reply to Rocket, 02-24-2005 17:58:48  
Vary your speed, take it for a ride run it through the gears work it a little,change your oil and filter and you will do fine.



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Rocket

02-24-2005 17:58:20




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
Another question here. How should I run the tractor. Should I vary the speed or keep it constant



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HOOKER

02-24-2005 17:49:15




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 Re: Break in time in reply to Rocket, 02-24-2005 17:43:56  
i just put 20 hrs. on mine changed the oil. felt for any metal with the help of a magnet(none). works like a champ almost everyday
jake



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gahorN

02-25-2005 12:35:02




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 Re: Break in time in reply to HOOKER, 02-24-2005 17:49:15  
Rocket, the most important break in consideration is oil pressure and do not "lug" the engine by operating at low rpm VS high loads. Keep the rpm up around mid levels at least during early work experience and do not work the machine hard for the first few hours. Very low rpms in a new machine is harmful to it in terms of breakin, but also do not overspeed it. Make sure your governor is operational to avoid overspeed.

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