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nelson jr

1066 injection pump and over revving

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1066 has picked up an odd trait, it will increase the rpm's on it's own and then will drop them back down also. I am assuming since it happens randomly sometimes not at all and other times frequently that it may be dirt related? or possibly a part that is hanging up in the pump? any help would be appreciated thanks for your time

revs go up and down sometimes 600rpm sometimes closer to 1000

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There are some friction disks that control your rpm's and they are getting worn out, your pump will need to be gone through. If you need help send me a pm and I can fix it for you or get you a rebuilt.

Danny

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DONT DELAY GETTING IT FIXED. I had to replace a complete engine in a 1086 that had the same symptoms. He let it go and had a complete engine runaway. Ran really really fast untill #1 rod let loose and went through the side of the block. It hit so hard it actually cracked the internal center webbing!!

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1066 has picked up an odd trait, it will increase the rpm's on it's own and then will drop them back down also. I am assuming since it happens randomly sometimes not at all and other times frequently that it may be dirt related? or possibly a part that is hanging up in the pump? any help would be appreciated thanks for your time

revs go up and down sometimes 600rpm sometimes closer to 1000

Fuel starvation. Have you changed the fuel filters?

Allan

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If they problem occurs randomly without a change in engine load it is most likely caused by either air in the system are a change in fuel charge pressure due to some obstruction.

If the over speeding occurs when the engine load changes it is almost always caused by slippage of the governor weight assembly in the pump. Normally the first indication of this is when you have the engine under a heavy load and then release the clutch.

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Gonzo were you completely unable to shut it down??

I hate to tear it down now as I kinda need it to feed at one farm. It did not happen at all today but was a problem yesterday after the motor warmed up. I am not opposed to pulling the pump off if necessary but with the deep snow I am feeding in I kinda need the old girl.

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I used to repair a lot of these pumps when the governor slip clutch let loose and they over reved. It was my understanding that they would only run up to like 3500 rpm or so due to the type of walking beam linkage used in these pumps. I wouldn't bet my life on that though. Saw a lot that waited until they could schedule a repair and a lot of customers who would be scared to even run them into the shop. On the other hand, had an engine run away and threw a rod out side of block knocking injection pump off so therefore it stopped. This was caused by the return check valve coming loose, went back inside inj pump and lodged under control sleeve on plunger. IH had previously issued a letter warning of this possible situation and urged us to change that check valve fitting to later style fixed orfice type. To this day, no injection pump repair facility will let a pump leave the place without the fixed orfice fitting. It is common for a inlet metered injection pump like a roosa master to have rpm fluctuations when starving for fuel but have not seen this happen on the ambac pumps.

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Gonzo were you completely unable to shut it down??

I hate to tear it down now as I kinda need it to feed at one farm. It did not happen at all today but was a problem yesterday after the motor warmed up. I am not opposed to pulling the pump off if necessary but with the deep snow I am feeding in I kinda need the old girl.

This was a customers tractor. His account of it sounded like the minions of **** coming after him. He tried to shut off the fuel to it and couldnt. By the time he got the fuel shut off the turbo had blown a seal and the engine was running one engine oil. Then it got ugly. When the rod broke through the block a ball of fire came out and singed his eyebrows and blew his stocking hat off of his head. The photo I loaded is poor quality but you will see both #1 and 2 rods broke and came through the block. Fuel pump work may not be cheap but the alternative is very expensive.

Interesting side note. This was on a 1086 that was used to run a TMR box at a Dairy here in Washington state.

post-429-1266548396_thumb.jpg

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I'll be alot more scared when I get done laughing. Tractor did not do it at all today either, if some of this snow melts off i can go back to feeding with the smaller equipment hopefully by monday or so.

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Very well said Gonzo, $850.00 for a pump won't go very far on a complete motor !!!!! The last one I bought from Case IH was 5800.00 plus labor :wacko:

Danny

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1066 has picked up an odd trait, it will increase the rpm's on it's own and then will drop them back down also. I am assuming since it happens randomly sometimes not at all and other times frequently that it may be dirt related? or possibly a part that is hanging up in the pump? any help would be appreciated thanks for your time

revs go up and down sometimes 600rpm sometimes closer to 1000

Had app. same thing happen while chopping silage,tractor would surge quiet a bit,then return to normal,case-ih mechanic asked if i had used fuel trt.,,,i had,he said it was passing moisture out of system,after that tank tractor ran normal,,,however when they pass moisture they usually have a miss-fire when rpm increases,,sounds like you may have pump issues,,,just thought i would throw this out to you,,good luck,hope you get it resolved quickly.--Jeff

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It shutdown the other day like the fuel jelled which had never happened to me before. I decided to pull the filters to see what was going on and found the primary sucked about half empty. Turns out there was a bunch of crap stuck in the petcock coming out of the tank. I had the tank off this summer during an overhaul and surely could have stirred up any dirt and crap from all these years of use. So far the revving problem has been quiet, I am still going to have the pump looked at but am hoping to wait till I do not need the tractor to feed.

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