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Allis Chalmers Discussion Forum

D15 slow crank

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12-20-2003 17:33:32

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Just did a tune up on this D15, it's been sitting for few years. Has a new battery also, cranks over very slow,any sugestions?

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12-21-2003 05:29:51

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 Re: D15 slow crank in reply to florin, 12-20-2003 17:33:32  
Florin, Might pull the starter and clean the hole it goes in real good. Use some sandpaper and/ or emory cloth and get it to shinny metal inside the hole. Also, might clean the surface of the starter where it contacts the side of the hole.Clean the bolt that holds the starter real good. You need the big cables if its 6-volt, if its 12-volt the small cables will be fine.Before you do all that though, you might try it a little and then touch the starter ,cables, etc. and see if something is gettig hot. Dale

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12-21-2003 09:08:05

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 Re: Re: D15 slow crank in reply to Dale(MS), 12-21-2003 05:29:51  
Yes Dale, I pulled the starter out and checked it with no load on it, seems to run ok, and yes if I crank it for a while the cables get hot. If I pull the plugs out seems to crank ok. I'm going to clean, like you said the sides of the hole out.
Thanks for your help.

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12-20-2003 23:14:17

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 Re: D15 slow crank in reply to florin, 12-20-2003 17:33:32  
After sitting for awhile the cylinders get dry, and a few spins the gum on the pistons get hot and turns to goo. Pull the plugs and squirt some light oil like WD-40 or whatever your pref. and don't be shy with it. Wait about a minute and spin it over without the plugs a little, spray it again and by the time you've put the plugs back in it should have helped bunches. If you still drag after it runs one good time then get to work on the starter and cables.

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12-20-2003 19:19:01

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 Re: D15 slow crank in reply to florin, 12-20-2003 17:33:32  
My little B did that until I got the largest cable I could find, especially if it is still 6 v.
I would jump straight to the starter and see if the cables are the problem.

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12-20-2003 19:24:33

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 Re: Re: D15 slow crank in reply to Ken/Wa, 12-20-2003 19:19:01  
I jumped strait to the starter, same thing

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12-20-2003 18:26:21

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 Re: D15 slow crank in reply to florin, 12-20-2003 17:33:32  
you don't think something is wrong with the engine? Before I cranked for the first time I added 1 table spoon of engine oil in each spark plug hole. It cranks over one time in the begining then has a hard time doing it again, even with another battery

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12-21-2003 02:31:43

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 Re: Re: D15 slow crank in reply to florin, 12-20-2003 18:26:21  
Sounds to me that you have the makings of a shorted armature in your starter, dirty armature or bad brushes. I just had to have the starter on my D15 diesel rebuilt. It could also be a dirty and coroded jumper plate inside the starter relay. Good luck!

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12-20-2003 18:19:28

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 Re: D15 slow crank in reply to florin, 12-20-2003 17:33:32  
I'd have the starter checkedat your local parts store then and or also check/replace your battery cables

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12-21-2003 05:27:15

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 Re: Re: D15 slow crank in reply to old, 12-20-2003 18:19:28  
Thank you guys for all the sugestions and help, I'm gonna get busy and get to work on it today see what happens, I'll let you all know!!

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08-12-2006 06:36:20

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 Re: Re: Re: D15 slow crank in reply to florin, 12-21-2003 05:27:15  
I recently purchased a D14 that ran and started fine till after I used it the first time. My starter is acting just like your starter was. I even tore it apart, turned the contacts, put in new brushes and bushings. And it still cranks slow. It will cranck a fire once or twice, disengage and then crank slow after that. And if I monitor the voltage at the battery while cranking, the voltage drops to around 7.5 volts. And it does that even if I have two batterys in parallel. What did you find out to be the cause of your trouble?
Thanks in advance,
Rick Roth

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