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Case Tractors Discussion Forum
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VAC distributor installation.

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Firemanjohn

01-21-2007 15:03:54




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I am trying to find flywheel markings on my VAC and am not having much luck. Can I get close enough just eyeballing TDC (the pan is still off the tractor) and putting it in or am I liable to miss a tooth on the distributor drive gear. Distributors are one of my weak spots lol. Thank you guys




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Paul f

01-22-2007 08:12:52




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 Re: VAC distributor installation. in reply to Firemanjohn, 01-21-2007 15:03:54  
I have both a DC and VAC and I will tell you Case must have picked the 98lb weakling at both plants to stamp the TDC on the flywheel. Niether one is particularly obvious. Especially with VAC having a helper turn the motor over slowly with the hand crank makes finding teh mark easier. The I put some white paint on smeared it over the marks and wiped it off...left the mark highlighted...

And while we are at it why did Case put the distributor and timing marks on opposite sides of the VAC tractor.

At least on DC I can turn the motor over with the belt pulley and the timing mark hole is close by and the mag (in my case distributor) is on the same side

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Joe (Wa)

01-21-2007 20:08:25




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 Re: VAC distributor installation. in reply to Firemanjohn, 01-21-2007 15:03:54  
About the same thing olddog said and expanded some (probably more than you want or need).

Rotate the crankshaft (CW as viewed from the front) until #1 cyl is TDC on the compression stroke (make sure it is not TC on the exhaust stroke).

The factory distributor attitude is with the rotor pointing near 3 o'clock to fire #1. When the engine is running the rotor will be turning CW.

Looking down on the distributor:
Stab the distributor with the rotor in place. The dist drive gears are helical, as the gears mesh the rotor will turn CCW so start the stab with the rotor pointing somewhere after 4 o'clock and when in full mesh the rotor will end up pointing near 3 o'clock when the distributor is seated.

When you get the rotor in that position tighten the hold down bolt. Loosen the clamp screw and turn the dist head until the breaker actuator is on the top of the cam lobe, set the points @ .020" with a feeler gage. Turn the dist head CW until the points are closed now turn the head back CCW until the points just start to open and tighten the clamp screw.

The engine firing order is 1342 and the rotation of the rotor is CW so when you put the cap on, put the #1 cyl wire in the tower that is near 3 o'clock, #3 wire near 6, #4 wire near 9, and #2 near 12. That is good enough to start the engine and tweak the timing in to TDC with a timing light.

The TDC timing mark is just a line scribed on the flywheel sometimes marked with 0. If you are using an induction timing light and cannot find the timing mark engine running at idle rpm and turning the distributor head, put the timing light pick-up on the coil wire. That will provide 4 times the light flashes to light up the timing hole. You can time the engine with the induction pick-up on either #1 or #4 or the coil wire, it is all the same timing.

Joe

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olddog

01-21-2007 16:37:53




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 Re: VAC distributor installation. in reply to Firemanjohn, 01-21-2007 15:03:54  
No, you're liable to miss it by 180 degrees AND one tooth! With the valve cover and dist cap off...Learn 3 things...Turn the motor by crank (starter) & watch the valves on the cyl farthest away from flywheel AND which way the dist turns. You will see that the valves move EVERY OTHER TIME AROUND! 1. Put cap back on dist(mag) - find where you want #1 wire to be and mark where rotor would be; on the body of the dist; so you can see that spot with cap off. 2. Put the piston at TDC......
3. of the power stroke of the valves.. Thats the time over that the valves DID NOT move. Drop the dist in the hole backing the rotor up a tooth OPPOSITE the way it turns. Couple of trys and you should end up with the rotor pointed at the mark where you wanted #1 to be on the dist housing. Yer done!!! Rotor pointing to #1 on the distributor housing at TDC of power stroke. This'll get a lot of different motors started. Look in the hole in the flywheel housing. The marks should be near. Clean em' & mark em'. Final time the engine running, to your engine specs.

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