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Tractor Talk Discussion Forum

Starting a rebuilt motor

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Darin in Nebras

06-07-2007 07:35:55




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Hello guys and gals, after you have just rebuilt a motor, what steps do you do to help break it in? Do you use any special oil for the first time(weight/brand)? Do you run it more then 40 mins on first oil change then change it? Just curious, I will be firing my tractor up this weekend and I just got done putting all new bearings, and rings in it. Thanks for the advice.

Darin




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BEN in KS

06-10-2007 12:03:02




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 Re: Starting a rebuilt motor in reply to Darin in Nebraska, 06-07-2007 07:35:55  
Starting an engine you've rebuilt yourself is the closest a guy gets to giving birth!



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Jiles

06-07-2007 19:50:26




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 Re: Starting a rebuilt motor in reply to Darin in Nebraska, 06-07-2007 07:35:55  
I have rebuilt hundreds of engines. If the engine was done right, there are no special instructions. WATCH the oil pressure and the temperature of the coolent for the first few hours. If temperature goes up, ease up or cut the engine off. If you cleaned everything professionally, I would change the oil and filter after about 20 hours.



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buickanddeere

06-07-2007 11:14:47




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 Re: Starting a rebuilt motor in reply to Darin in Nebraska, 06-07-2007 07:35:55  
Don't baby it but don't lug the guts out of it or run it at red line 100% of the time. Idling, putting around and low coolant temps will mesh up the ring seating. Low rpms also limit the splash lubrication on cam/followers. Then again idling, putting around and low coolant temps will shorten the life of any engine. Being a re-ring job rather than an overhaul or rebuild. Break-in is somewhat of a mute point. Did you place the followers back in thier origional bores? Are the rockers arms back on their original pivits?

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glennster

06-07-2007 07:48:19




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 Re: Starting a rebuilt motor in reply to Darin in Nebraska, 06-07-2007 07:35:55  
here is the way i break in a fresh motor, everybody will have their own techniques. good lube is very important. fill an oil can with the recommended oil for your motor. put a couple squirts on each cylinder, also lube the rocker arms and squirt some around the valve springs so the valve stems have some initial lube. crank the motor with the plugs out, watch the oil pressure gauge till you start to get some pressure, that way you know the pump is primed. hook everything up an fire up the motor. i let em run at fast idle while i check every thing out. look for leaks ect.
if everything is good, run the tractor around the yard, road, wherever of at least a half hour or so, vary the engine speed, dont go above 1/2 throttle. bring her back in the shed, retorque cylinder head if necessary, recheck everything, retighten all the hoses ect, check fluid levels, watch the oil pressure!!. if all is well a couple days of easy running will break it in.

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