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Timing a TO20

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mike

07-05-2003 07:00:05




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how do I set timing on a TO20. Timing mark on flywheel? Where is tab?




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Jerry

07-05-2003 08:27:09




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 Re: Timing a TO20 in reply to mike, 07-05-2003 07:00:05  
I have a TO-30 and I believe they have the same timing marks. Mine has the timing numbers on white spot on the flywheel that is visible throught a hole in the engine casting on the left hand side. This is the way I time it. I take the # 1 plug out and rotate the engine with the starter until the # 1 piston is rising on the compression stroke and the timing mark lines up with the notch on the engine casting. I then take the #1 spark plug wire and put a small piece of wire in the plug socket and hold in near a good ground.( Don't let it touch your finger or any body part unless you like to big shocks!) I loosen the distributor and slowly rotate it until the spark fires (you'll hear an audible "zap"). At that point you are statically timed. (You might have to do it sveral time to get it right.) I then put the plug back in and conect the plug wire and start the tractor. I then check it with a timing light while it is running and verify that the centrifugal advance is working. this method will work on all old fashoned (points and condensor) distributor ignition systems. Hope this helps.

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Allan

07-07-2003 14:44:04




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 Re: Re: Timing a TO20 in reply to Jerry, 07-05-2003 08:27:09  
Jerry, how do you determine compression stroke? Do you pull the valve cover to check when the compression valve opens? Thanks.



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Jerry

07-08-2003 09:57:35




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 Re: Re: Re: Timing a TO20 in reply to Allan, 07-07-2003 14:44:04  
Another point. When the engine is near and at the top of the compression stroke, both valves should be "closed". Neither valve should begin to open.



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Jerry

07-08-2003 09:53:22




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 Re: Re: Re: Timing a TO20 in reply to Allan, 07-07-2003 14:44:04  
Looking at the valves is certainly one way to do it but on my TO-30 that requires removing the fuel tank to be able to remove the valve cover. A trick I learned from my Dad was to hold your finger over the #1 plug hole and feel the compression. (If the engine is on the exhaust stroke than the exhaust valve is open and there's very little compression.) You need a remote starter switch or a starter person to do this. An alternative is to screw in a compression guage and crank the engine. A third way, (and maybe the easiest way) "if" you haven't really "lost" the timing (i.e. removed the distributor and cranked the engine)is to note where the #1 plug lead comes out of the distributor cap. Remove the cap and rotate the engine until the rotor is pointing to the tab on the distributor cap from the #1plug wire on the underside of the cap. That should get you close enough to see the tming marks on the flywheel through the hole in the engine casting. Rotate the engine so the timinhg mark lines up with the notch and begine the proceedure I described in my previous note. Hope this helps.

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Tex Ferguson

07-06-2003 17:30:30




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 Re: Re: Timing a TO20 in reply to Jerry, 07-05-2003 08:27:09  
Another (static) method is to clamp a thin piece of paper -- in the old days, our grandfathers used cigarette papers -- between the points. Make sure the distributor would be firing #1 cylinder, of course. Assuming the distributor shaft rotates counter-clockwise, as my TE-20 does, set the flywheel on the prescribed mark(I think it is 20 BTDC for full advance), rotate the distributor cam as far left(counterclockwise) as it will go to simulate full advance, then ease the distributor body around counter-clockwise(allowing the cam to move also) until the paper begins to loosen between the points. This is the location where the points will begin to open at higher rpm's. I always check later with a timing light also. Use all three hands to do all the holding and paper-pulling required by this method. Good luck!
Tex

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