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Allis Chalmers Discussion Forum

5040 starter - maybe not?

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04-10-2012 16:58:55

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I'm back to working on my 5040 again where I left off and I'm wondering now if it is isn't the starter after all. After taking the dash apart, new cables, neutral safety OK, bench test OK, when re-installed it only makes a solid clunk once or twice without turning. Even across the +/- on the starter terminals just a clunk, fire and a red hot screwdriver immediately.
Friend of mine suggested maybe a hydraulic lock in one of the cylinders - maybe injector leaked down filling a cylinder with diesel fuel? Possible? Best way to test? (Crankcase has normal oil level by the way)

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04-11-2012 06:42:49

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 Re: 5040 starter - maybe not? in reply to prawnfarmer, 04-10-2012 16:58:55  
My dad bought a 5040 new and from day one that thing was a pain to start after rebulding the starter twice I put on an bosch and never had problens again with the old starter sometime you would think that the engine was locked up.

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Bob Bancroft

04-10-2012 17:10:26

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 Re: 5040 starter - maybe not? in reply to prawnfarmer, 04-10-2012 16:58:55  
The original starters on those gave us troubles almost from brand new. Seems like there was an alternative, maybe a Bosch? Otherwise you should be able to turn the engine over somehow- screwdriver on ring gear- something on the front pulley- tow in high gear........

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04-10-2012 17:27:36

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 Re: 5040 starter - maybe not? in reply to Bob Bancroft, 04-10-2012 17:10:26  
I've had starter off 3 times now & as you probably know its a real pain - may have to bite the bullet and try to move the ring gear, though. How much risk of me bending/breaking a connecting rod by pulling it? Would loosening all 3 injectors release any diesel fuel, if there, inside the cylinder(s)?

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04-11-2012 04:29:24

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 Re: 5040 starter - maybe not? in reply to prawnfarmer, 04-10-2012 17:27:36  
If it has individual glow plugs, unscrew, and pull them out, one at a time, trying to turn the motor over, after pulling one. That way, you could ID the cyl, in question, and not have to remove the good injectors.

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Bob Bancroft

04-11-2012 03:44:24

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 Re: 5040 starter - maybe not? in reply to prawnfarmer, 04-10-2012 17:27:36  
Generally if you tow something and it doesn't want to turn, a tire just skids. Yes- loosening and/or pulling injectors would be a sure way of telling what's down in there.

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