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Farmall & IHC Tractors Discussion Forum
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WD-9

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JOE ZIP

10-22-2006 07:09:44




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My brother is trying to tell me that a WD-9 turns backwards from a W-9. I find that a little hard to believe. Can one of you help me out on this.




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Steven@AZ

10-22-2006 07:17:21




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 Re: WD-9 in reply to JOE ZIP, 10-22-2006 07:09:44  
The distributor/magneto turns backwards from a gas (W-9).

Engine still runs the same direction. The only engines I'm aware of that run backwards are in my Hondas.



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D Slater

10-22-2006 08:22:34




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 Re: WD-9 in reply to Steven@AZ, 10-22-2006 07:17:21  
Steve, 9 series not my strong point, but doesn't the distributor turn the same way on 9 series gas or diesel?



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Wardner

10-22-2006 09:16:04




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 Re: WD-9 in reply to D Slater, 10-22-2006 08:22:34  
Nope.

The distributer, tach, engine mounted hour meter, and the distributer-drive hydraulic pump all turn opposite from the gas models. The diesel gear train from the crank to distributer has an extra gear that reverses the distributer.

All the parts that I mentioned carry different part numbers from the gas models.



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55 50

10-22-2006 13:25:00




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 Re: WD-9 in reply to Wardner, 10-22-2006 09:16:04  
Must have been a good technical reason why that was done. Any idea what the reason was?



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D Slater

10-22-2006 11:21:12




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 Re: WD-9 in reply to Wardner, 10-22-2006 09:16:04  
Never had the opportuntity to work on a W9 gas engine. So you are saying it doesn't have a extra idler gear between crank gear and distributor drive? With the distance I always thought they must have. Don't have much information on 9 series, but some of what I can find is showing gas and diesel distributor turning the same direction (they would be different advance and different #) and some shows different. So the reason Im asking questions is to find out for sure.

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Wardner

10-22-2006 17:15:24




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 Re: WD-9 in reply to D Slater, 10-22-2006 11:21:12  
D Slater,

You are stretching the limits of my diesel experience. I have never taken one apart and I can't find a photo of the gear setup.

All overhead valve gas models in the letter and 00-50 series have the cam on the right side. All diesels have the cam on the left side. All motors (gas and diesel) have the ignition on the right side. The diesels have an idler to span the distance. This is the best I can do.

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D Slater

10-22-2006 12:33:40




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 Re: WD-9 in reply to D Slater, 10-22-2006 11:21:12  
Wardner another Question if you have 9 information. Specifications sheet I have shows 9 gas as having 54 teeth cam gear. If this is correct 6 series used a bigger cam gear, so if 9 gas uses same # of gears as 6 gas, I'm trying to figure out how they made it to distributor drive without extra gear.



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Wardner

10-22-2006 17:34:18




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 Re: WD-9 in reply to D Slater, 10-22-2006 12:33:40  
The six series gas motors did use a 58 tooth gear: four more than the nine series. The layouts are the same. I suppose the pitch of the teeth is much larger and consequently the pitch diameter is also larger on the nine series.

I consider you to be the "primo" authority on this board for '40 thru '60 IH internals and I am surprised that you are asking questions instead of giving answers. I am also surprised that you weren't aware of the reverse rotation of the distributor. I thought all of us with just a passing knowledge of gas-start diesels knew this.

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D Slater

10-22-2006 18:08:26




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 Re: WD-9 in reply to Wardner, 10-22-2006 17:34:18  
Never had a 9,600 or 650 on the place. Now on the 6 264 and 281 diesel its a different story. The cams are on same side of engine for gas and diesel. The reason they turn the pump and distributor different between gas and diesel is that on gas the crank gear drives cam gear then distributor or hyd. pump drive gear, On diesel crank gear drives idler gear, idler drives cam,cam drives dist. or hyd. pump drive. Was in my head for some reason that 9 series gas used a extra gear in front somewhere. Need to get a W9 parts book.

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Wardner

10-22-2006 09:19:23




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 Re: WD-9 in reply to Wardner, 10-22-2006 09:16:04  
I should also point out that this is true in all the gas-start diesels from IH. Well, maybe. I am not sure about the engine in the TD-24.



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JOE ZIP

10-22-2006 07:52:09




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 Re: WD-9 in reply to Steven@AZ, 10-22-2006 07:17:21  
Thanks, I just couldn't see how in the world they could run oppisite because the whole drive train would've had to been changed.



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Wardner

10-22-2006 18:16:04




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 Re: WD-9 in reply to JOE ZIP, 10-22-2006 07:52:09  
It wouldn't matter to the tractor if the motor ran backwards. The ring gear in the differential would be flipped, like a cotton harvestor, so that you would still have five speeds forward.

Twin prop boats always have a left and right rotating engine. I believe most, if not all buses, with powerplants in the rear, have counter rotating engines. It has something to do with their transmissions.

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