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Allis Chalmers Discussion Forum

WD timing issue

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Author  [Modern View]

06-14-2012 19:56:51

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Dad had the engine rebuilt. It runs but is a little off. It runs the best when he turns the magneto ways past the mark. You can't keep it there because no slot space. What is wrong?

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06-23-2012 10:42:11

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 Re: WD timing issue in reply to J.Heikk, 06-14-2012 19:56:51  
Find TDC of Number one cylinder and remove the mag. The drive slot should be horizontal. If not unbolt and remove the governor and turn it so when bolted up the slot is horizontal, Then all you have to do is retime the mag to the engine.

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Gordon in IN

06-15-2012 21:59:22

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 Re: WD timing issue in reply to J.Heikk, 06-14-2012 19:56:51  
You may have a broken impulse spring coupling. Check to see if the magneto impulse coupling is working properly. It should retard the timing to start the engine and then advance it to proper timing when the engine starts.

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06-15-2012 17:34:10

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 Re: WD timing issue in reply to J.Heikk, 06-14-2012 19:56:51  
Internally the mag has a set of gears. They have to be timed when installed. You are off a couple teeth. YOur trying to fix it externally by adjusting past the slot.

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06-15-2012 17:35:29

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 Re: WD timing issue in reply to steve(ill), 06-15-2012 17:34:10  
look at the second photo on deuys page


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Bob Bancroft

06-15-2012 09:29:39

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 Re: WD timing issue in reply to J.Heikk, 06-14-2012 19:56:51  
It is imperative on those engines that the gov. gear/mag. drive be timed correctly. (Someone might ignore that because it's not necessary if you have a battery ignition.) I just can't recall for sure- but it seems like the slot in the mag. drive gear is oriented square with the engine(either vertically of horizontally) when #1 is @TDC. I suppose the impulse drive could be jammed up, but then it might not even start. Or it could be the wrong one. The internal timing in the mag. also needs to be correct.

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06-15-2012 10:32:25

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 Re: WD timing issue in reply to Bob Bancroft, 06-15-2012 09:29:39  
Okay. It seems to be running too hot. Something is off with the timing.

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Bob Bancroft

06-15-2012 10:55:24

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 Re: WD timing issue in reply to J.Heikk, 06-15-2012 10:32:25  
Indeed. "Laboring", with the associated running hot, is a sign of retarded timing. I forgot to mention that the gear is marked, so using the slot to time it is not necessary, just a way I used to check myself.

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