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Allis Chalmers Discussion Forum

rebuilds don't last in 429 ?

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tim Lockey

12-08-2010 16:20:15

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Can anyone tell me if there are some issues when rebuilding the 429 diesel in the 7030? My cousin has had 2 of the tractors, engine problems with both, oil burning and knocking, leading to rebuild, and both have not lasted more than a year or two at best. Is there something that his mech. is missing? Wondered if these engines have some issue that causes a rebuild to go bad, or if normal good practices should make a rebuild good as new.

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Big Boy

12-10-2010 18:01:09

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 Re: rebuilds don't last in 429 ? in reply to tim Lockey, 12-08-2010 16:20:15  
The must important thing on AC engine life is oil change intervals.They have a true full flow oil filtration system. That means, all the oil from the oil pump goes through the filters first then to the pressure regulator. That means the filters start to clog very fast & the filter bypass is open & unfiltered oil is going to the mains & rods causing early engine failure. So if the oil is not changed the engine is running on unfiltered oil. If for some reason the oil can't be changed, change the filters!! Other engines only filter the oil going to the bearing,& the pressure regulator is at the oil pump.

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12-10-2010 08:23:28

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 Re: rebuilds don't last in 429 ? in reply to tim Lockey, 12-08-2010 16:20:15  
I think its called a lubrifinder? bypass it
they caused problems when thet were new

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Brian Jasper co. Ia

12-09-2010 22:20:00

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 Re: rebuilds don't last in 429 ? in reply to tim Lockey, 12-08-2010 16:20:15  
My experience is rebuilds go bad for a reason. Guy doing the rebuild doesn't know what he's doing, or the operator is abusive to the machine. Like someone else says, a rebuild isn't just a set of rings and new std bearings. The 426 Allis is known for being very durable...

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12-09-2010 15:01:14

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 Re: rebuilds don't last in 429 ? in reply to tim Lockey, 12-08-2010 16:20:15  
I have done 2 with TotalSeal kits and only 1 had issues after operator ran it hot with a chaff plugged radiator mowing weeds.Good one still going strong after 10 years.

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12-09-2010 10:22:53

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 Re: rebuilds don't last in 429 ? in reply to tim Lockey, 12-08-2010 16:20:15  
If you are using a universal enginge kit, to rebuild, the sleeves may need to be fitted to the block
and the piston may need to be measured because they do not match piston to sleeve like they did in the past. some small things that will cause early engine failure if not correct.

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12-09-2010 05:19:20

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 Re: rebuilds don't last in 429 ? in reply to tim Lockey, 12-08-2010 16:20:15  
What do you call a rebuild? More to a rebuild then a sleeve kit. Was head redone, crankshaft injecters, pump,block prep and cleaned with a hot tank and all parts cleaned,put together in clean area, not outside under a tree.

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