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Timing

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Bill Jolley

12-06-2000 08:32:49




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Some one on this forum mintion a way to tell if you are dead top center by taking off the valve cover and checking weather you;re valves are up or down. Can yall repost that method? Also Bob M. or any one else, please if you have any other help in regareds to timing, it will be apperacted.
Bill




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Bus Driver

12-06-2000 12:59:58




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 Re: Timing in reply to Bill Jolley, 12-06-2000 08:32:49  
On the cub, the crank pulley (bottom of the engine at the front) has two timing notches if the tractor has a distributor. As the engine is turned with the hand crank, the first notch to line up with the pointer (carburetor side of the engine at front pointing to the pulley) is for the running advanced timing. Use the second notch, which is close after the first. This notch shows top dead center for cylinder 1 (the front of the engine). With front plug removed, put your thumb over the spark plug hole and turn engine with the hand crank. When you feel pressure rising, turn until the pointer lines up with the second notch, the #1 cylinder is at top dead center ready to fire. Remove the hand crank. Rotate the distributor to line up the rotor with #1 spark plug position on the distributor cap and tighten the clamp. If you have a magneto, turn the magneto SLOWLY until the impulse coupling just clicks. Tighten the clamp and you are timed properly. Do not remove the magneto without consulting a manual. If disassembled improperly, it may be difficult to get it reinstalled and timed properly.

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Bus Driver

12-07-2000 05:10:07




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 Re: Re: Timing in reply to Bus Driver, 12-06-2000 12:59:58  
My earlier answer had a mistake. Add this to the earlier information. To do the final static timing of the distributor, rotate the distributor until the points just begin to open and tighten in that position. After cranking, use a timing light if you choose to verify and do finer adjusments.



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ltf in nc

12-06-2000 09:18:49




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 Re: Timing in reply to Bill Jolley, 12-06-2000 08:32:49  
Per your request, Not knowing how experienced you are at locating the TDC of the number one plug, I submit the following. Remove the valve cover. Turn the engine until both valves on the cylinder nearest the radiator have clearance on the rocker arms. Then look at the rotor button to determine if the rotor is pointing to the terminal in the distributor cap that has the wire that goes to the front cylinder. If not, remove and rotate the distributor until this occurs. Attempt to start the engine, if it starts all is OK. If it does not start rotate the distributor exactly 180 degrees and start the engine. It should run.

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Bill Jolley

12-06-2000 11:13:21




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 Re: Re: Timing in reply to ltf in nc, 12-06-2000 09:18:49  
I took the valve cover off but don't see any rocker arms. Does a Cub have rocker arms?
Bill



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ltf in nc

12-06-2000 15:54:38




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 Re: Re: Re: Timing in reply to Bill Jolley, 12-06-2000 11:13:21  
Scroll down the page on the link that I sent to you by e mail. On the drawing on the left side of the screen you will see the rocker arm. On the drawing it is just labeled rocker



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The Red

12-06-2000 12:14:14




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 Re: Re: Re: Timing in reply to Bill Jolley, 12-06-2000 11:13:21  
With the cover off, are the valves opening and closing????? ??



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Bill Jolley

12-06-2000 16:47:33




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 Re: Re: Re: Re: Timing in reply to The Red, 12-06-2000 12:14:14  
Hi Red, Yes the valves are opening and closing.
Bill



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H MN

12-06-2000 08:44:04




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 Re: Timing in reply to Bill Jolley, 12-06-2000 08:32:49  
Bill: Take the #1 spark plug out and hold your finger in the hole and have a good friend HAND crank untill you feel the pressure building. Max pressure will be real close. Then check timing TDC marks per your model engine. This saves messing with valve covers. harvey



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Bill Jolley

12-06-2000 08:50:44




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 Re: Re: Timing in reply to H MN, 12-06-2000 08:44:04  
Thanks Harvey. Please explane checking TDC marks per you're modil rngine.
Bill



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H MN

12-07-2000 05:07:30




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 Re: Re: Re: Timing in reply to Bill Jolley, 12-06-2000 08:50:44  
Bill: TDC means Top Dead Center. Same as having the piston right at the very top of its move up. The timing or firing of the sparkplug often takes place just befor that depending on model. Give my method another try. When your finger feels the start of air pressure, your friend needs to HAND crank just a bit less than another HALF turn.. That should be real close to "TDC" or max air pressure. The rotor in the distributor should be pointing at the plug wire for that same cylinder. By the way, most IHC engines have #1 cylinder as the front one..... Be sure to click open "MANUALS" to your left on this screen and buy a shop manual for further detailed instructions. Money well spent. Put some sealer on that valve cover when you replace it so it doesn't always seep oil. Good luck. harvey

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Bill Jolley

12-07-2000 05:50:07




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 Re: Re: Re: Re: Timing in reply to H MN, 12-07-2000 05:07:30  
Hey guys ,I appreciate all the good help! Its so resuaring in this day and time that We fellow Americans can find the time to help our fellow men. Wish me luck. I'll be trying out all of yalls derections today! Bill



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