Re: Setting Points

Posted by SadFarmall on November 19, 2011 at 20:50:29 from (118.209.86.123):

In Reply to: Setting Points posted by Stephenscity on November 19, 2011 at 10:08:15:

With the magneto ignition tractors I proceed as follows.

1). Set the timing well after top dead centre

2). Crank the motor to the timing mark.

3). Gently rotate the magneto till the impulse trips.

Timing is set.

Do not set timing before top centre and rotate magneto to set timing. If there is play in the magneto drive the timing will not be set correctly.

To check timing on coil ignition.

Using a voltmeter with leads sufficiently long to reach to crank handle side of tractor. Assuming positive Earth and 6 Volt

1). Connect negative lead of 0-10 V voltmeter (NOT digital type) to the low tension side of the coil.

2). Connect positive lead of voltmeter to Earth/Ground/Chassis

3). Slowly crank motor. The voltmeter should flick from 0 to 6 volts as the pulley notch passes the timing pointer.

If the timing is out.

1). Ensure timing pointer and pulley notch are aligned.

2). Set timing after timing point. (i.e. after top dead centre)

3). Rotate distributor back (i.e. to advance timing) until voltmeter flicks.

Timing is set.

You can also use a 6V lamp instead of a voltmeter.

If you do not have a lamp or voltmeter

1). Set motor to timing point.

2). Open points and slide a cigarette paper between them.

3). Rotate distributor until the paper can just be removed without tearing it.

Again, the timing should be brought back toward the correct firing point to ensure distributor drive gears are in mesh. The cigarette paper technique will not work with impulse coupling magnetos.

Has anyone tried using a timing gun? Need a long lead and a separate twelve volt supply if not already fitted to the tractor. A bit of white chalk on the timing pointer and pulley notch… should be easy?

SadFarmall

This post was edited by SadFarmall at 20:53:01 11/19/11.

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