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Allis Chalmers Discussion Forum

426 ci motor

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11-01-2004 17:49:07

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We have an '84 Gleaner L3 with 3800 hrs on the machine. The original engine blew at 2000 hrs -- put a hole in side of engine. At the time a new engine was put in the combine. Now, this "new" engine just let loose at 1800 engine hrs - no holes in the block, but it appears that one of the pistons disintegrated inside the engine. Very disappointing that this engine doesn't stand up. Overall the combine is a nice unit. We've mantained it very well over the years. What are others expierences with this motor - good luck or not? This is our only machine with an AC engine, the rest are JD's (404 ci) in tractors, so we don't have anything else AC to compare it to.

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11-02-2004 03:33:04

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 Re: 426 ci motor in reply to GIM, 11-01-2004 17:49:07  
Two main problems with the 426 that I am aware of.

Fuel injection nozzles and connecting rod bolts. It sounds as though the first engine destroyed itself due to a broken rod bolt (Hole in the block). When one of the engines is down for any reason, the rod bolts should be replaced. Find a machine shop in your area who is in to building engines for tractor pulling. There are aftermarket bolts that will NOT BREAK. Expensive, yes, but not nearly what a motor costs.

The second engine sounds like injector failure. AC uses a four hole injector tip, meaning the holes are extremely small and easily fouled by contaminents (water, etc) When a hole plugs, the nozzle dribbles instead of spraying. If you are getting lots of black smoke, you probably have a nozzle plugged. When the nozzle dribbles it sends raw fuel down the side of the piston and then burns it. This will cut a fire groove in the side of the piston and cause eventual failure.

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