Magneto E-gap

As I understand it, normally you would use the T150 e-gap tool or the T-100 timing jig to set the e-gap [ie; points just opening].

I am thinking that you could also use the appropriate L or R pin-in-place holes [for the T-118 tool] to locate this same reference position since it also appears the be the point at which the points are just opening.

Is this typically the case?

Bruce

bdserv said:

As I understand it, normally you would use the T150 e-gap tool or the T-100 timing jig to set the e-gap [ie; points just opening].

I am thinking that you could also use the appropriate L or R pin-in-place holes [for the T-118 tool] to locate this same reference position since it also appears the be the point at which the points are just opening.

Is this typically the case?

Bruce

Click to expand...

The T-118 tool has some play to it so I'm not sure it's really accurate enough to set the e-gap. The T-100 tool is not really required for setting the e-gap...it just helps with holding/rotating the mag & rotor. The T-150 tool is the correct way to position the mag at the point opening location.

Skylor

Egap

The T-150 tool is used to properly time the points to when they begin to open.
You then need to gap the points to .008-.010 at max opening. Then when you position the rotor gear with the left or right mark in the straight up position, you use the insertion pin in the left or right hole to corordinate the timing of the two gears. So technically to answer you question, No. you first need to use the egap tool. http://www.victor-aviation.com/pdf/SlickMagOverhaulManual_L1363D.pdf

https://m.youtube.com/watch?v=XhHBoyGVvjQ

Slick T-150

agirard7a said:

The T-150 tool is used to properly time the points to when they begin to open.
You then need to gap the points to .008-.010 at max opening. Then when you position the rotor gear with the left or right mark in the straight up position, you use the insertion pin in the left or right hole to corordinate the timing of the two gears. So technically to answer you question, No. you first need to use the egap tool. http://www.victor-aviation.com/pdf/SlickMagOverhaulManual_L1363D.pdf

https://m.youtube.com/watch?v=XhHBoyGVvjQ

Click to expand...

The slick overhaul manual states "Using a timing light, adjust the contact points to be just opening when the frame is against the T-150 gauge. This will provide a point gap opening of .008-.010 inches."

Skylor

Looking at this backwards for a minute...

If you use the e-gap tool and set up the points to just open at that rotor position, then that rotor position is obviously where you want [and get] the spark.

If the rotor gear is indexed to the rotor shaft and the distributor block gear is indexed to the rotor gear, then it seems that the pin location will also follow to coincide with the e-gap setting. You get the spark when the points open, you want the points to open at max flux change, and you pin the magneto here so you can align the occurrence of the spark to the base timing angle.

If the pin location does not coincide with the e-gap and points just opening rotor location, what is the purpose of pinning the mag and installing it in this condition at the base timing angle?

.... just trying to understand how it all works together... mainly because I have a LASAR mag I am working with that does not use the T150 tool for e-gap but instead requires the T100 tool with the timing plate on it.

Bruce

ps - good point about the pin location being less than precise. That by itself may be the reason not to use it as a reference.

agirard7a said:

The T-150 tool is used to properly time the points to when they begin to open.
You then need to gap the points to .008-.010 at max opening. Then when you position the rotor gear with the left or right mark in the straight up position, you use the insertion pin in the left or right hole to corordinate the timing of the two gears. So technically to answer you question, No. you first need to use the egap tool. http://www.victor-aviation.com/pdf/SlickMagOverhaulManual_L1363D.pdf

https://m.youtube.com/watch?v=XhHBoyGVvjQ

Click to expand...

You don't set gap on a slick mag. You set the opening of the points to the optimum position of the magnet. You simply verify the fully open gap is in range. You are really looking for wear with that step, not adjusting. If you set the gap, as you describe you would undo the egap setting you made in the first step. There is only one thing to adjust here.

bdserv said:

As I understand it, normally you would use the T150 e-gap tool or the T-100 timing jig to set the e-gap [ie; points just opening].

I am thinking that you could also use the appropriate L or R pin-in-place holes [for the T-118 tool] to locate this same reference position since it also appears the be the point at which the points are just opening.

Is this typically the case?

Bruce

Click to expand...

Here is a link to a video. At least you can see what it is.


https://youtu.be/nzkykFRlBgw

Cm