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Case Tractors Discussion Forum
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Timing for 47 VAC

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Dave

06-06-2004 06:10:39




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At what position is the rotor when number 1 is at TDC ? Manuals haven't arrived and I'm tired of trying to guess. Also, I'm assuming number 1 is the front cylinder.




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Sam#3

06-07-2004 07:17:13




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 Re: Timing for 47 VAC in reply to Dave, 06-06-2004 06:10:39  
Wait for the book and don't guess. Remember, #1 TDC also occurs on the #4 compresson stroke. There's a timing mark on the flywheel which corresponds with #1 compresson stroke. If someone comes across with the location of the mark go with it, if not, I'll be home in the morning and add the info.

Good luck
Sam



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Sam#3

06-08-2004 09:11:17




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 Re: Re: Timing for 47 VAC in reply to Sam#3, 06-07-2004 07:17:13  
The timing mark is located under a teardroped shaped cover on the left side of the torque tube.
The mark is "DC1&4/EX.CL." and should be centered in the inspection port.
From my I&T C-16 manual I quote:
"Install the distributer unit to the cylinder block opening with the rotor(finger) under the number one terminal in the cap. Rotate the distributer housing in a counter-clockwise direction until the breaker contacts have just opened; then, tighten the distributer housing clamp. Firing order is 1-3-4-2."
Now, with all that said also notice what Joe said. The shaft can be placed in four positions and with the wires connected in proper sequence the engine will run properly.
Just a side note: When I aquired my VAC the cap had been forced on 180 degrees off and it still ran.
Good luck.
Sam

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Joe (Wa)

06-08-2004 09:42:21




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 Re: Re: Re: Timing for 47 VAC in reply to Sam#3, 06-08-2004 09:11:17  
Thanks Sam for clearing up my muddy post.

Joe



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Joe (Wa)

06-07-2004 11:12:54




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 Re: Re: Timing for 47 VAC in reply to Sam#3, 06-07-2004 07:17:13  
Well that is a good point. The timing mark will probably look like this "D.C. 1&4" with a line under it and possibly more marking under the line.

Both #1 & 4 are at TC. One will be at the top of the compression stroke and the other at the top of the exhaust stroke since they fire 360 degs apart.

As you are moving #1 up on the compression stroke to set timing the rocker arms on #1 will be stationary and there will be compression at the spark plug hole. At the same time #4 is moving up on the exhaust stroke and the rocker arm will be in motion on exhaust valve.

Joe

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Joe (Wa)

06-06-2004 12:56:50




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 Re: Timing for 47 VAC in reply to Dave, 06-06-2004 06:10:39  
Correct #1 is fwd. I will date myself as an old geezer here. The position of the rotor relative to #1 cylinder is called distributor attitude. The factory attitude of the Vac engine places the rotor pointing toward the engine front at about 9 o�clock (looking down on the distributor) when #1 is TDC. The distributor can be stabbed in gear mesh to position the rotor 90 degs from that in either direction or 180 degs and still provide the correct timing. Once you have positioned the rotor in the attitude that you want for #1 cyl, run the wires to the remaining cylinders in firing order (1342) in rotor cw rotation.

Joe

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Joe (Wa)

06-06-2004 14:02:22




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 Re: Re: Timing for 47 VAC in reply to Joe (Wa), 06-06-2004 12:56:50  
Now that I have dated myself as an old geezer, I will have to correct that to brain dead old geezer.

The factory attitude with #1 TDC is indeed rotor pointing toward the front of the engine looking down on the distributor but that is near 3 o'clock not 9 o'clock. You can put it in any of the other 3 places I mentioned above if you prefer. To clarify timing further let�s use 3 o�clock with #1 TDC.

The distributor drive gear is helical, as it is meshed the rotor will turn cw. When you install the distributor, have #1 TDC, have the rotor pointing near 1 o�clock and when the drive gear is in full mesh the rotor will have rotated cw to near 3 o�clock. Tighten the clamp bolt just enough to keep it in full mesh. You now want to rotate the distributor head cw until the points just start to open and the rotor still points near 3 o'clock. The contact on the rotor should now be lined up with the contact in the cap for #1 wire tower. Tighten the clamp bolt.

After the engine is running, it is best to fine tune the timing with a timing light.

Joe

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