It's always best to use a proper feeler-gauge to set the optimum distance, however - If it gives the required clearance distance - yes, you can.
Yes, I have used a matchbook for decades, on my 45 IH , my 53 willies and several newer cars that i no longer have. I used to keep a spare set of points in the tool box because you don't know when they are going to break and back then i always had a book of matches handy, they also worked to set the magneto especially on older equipment I find ball park is close enough
i always had a meter with dwell on it you adj your points base and keep the gap the same Addition to above: Haven't messed with a points ignition in quite some time, but still have a Sun distributor machine and remember how to do it, if it's a dual point distributor the easiest way is to block one of the sets of points with a matchbook cover or thin piece of cardboard in between the points and set the dwell on the other set, then put the matchbook cover between the point set you just set the dwell on and set the dwell on the other set, then remove the matchbook cover and your done. If you're doing this on the car (as opposed to doing it on a distributor machine) you should then re-set or at least check the timing.
Use a dwell meter if you can get your hands on one. Give us the year, make and engine info and we'll give you the point gap and dwell specs. Most point gaps ranged from .015" to .025". You can use a matchbook cover if you are in a jam. The thickness of a matchbook cover is just under .015".
mf 202 industrial tractor with Z134 engine is .022
I would start out at 15 thousands, that's standard on most motors,
The cover over the points / timing set plate on the right side of the bike.
Set the parking brake, put the gearshift in neutral then pop the distributor cap and set it out of the way. Turn the engine by hand until the cam follower on the points is right over one of the 4 high spots of the distributor cam. It doesn't matter which one, they're all the same height. Loosen the points retainer screw and use another screwdriver to set the points gap. I typically go for about .016 to .018 inch (.4 mm) or about the thickness of a matchbook cover if I'm stuck somewhere without a feeler gauge. Once I have the points where I want them I use another screwdriver to tighten the screw while I hold the points in position using the first screwdriver. Note that the points have a notch that allows you to use a screwdriver to position the stationary side of the points. Once you're done with that, re-set the timing.
Ignition points are found beneath the distributor cap. Sets have 1 or two pieces depending on the brand. It looks like a small record player arm without the turntable. As the distributor shaft turns the gap opens and close rapidly, allowing coil voltage build and then pass through to the rotor and distributor cap. There is also a small device called a condenser attached to the points with a wire. It looks like a small cylinder. It should be replaced if you don't know its age or condition.The dwell angle for V-8 engines is commonly accepted as 28-32 degrees. It is best checked using a dwell meter. You can also set the point gap using a paper matchbook cover. Insert the cover and close the gap using the adjustment screw until you feel slight drag on the matchbook cover when you remove it. That trick will get you close enough to run the engine and fine-tune it properly.Make sure you set the ignition timing after the dwell is set. Dwell will change your base timing, but not the other way around.
Point-equipped V-8s are generally accepted to have a dwell angle between 28-32 degrees. This is best set with a dwell meter. You can use a matchbook cover in a pinch until a dwell meter is used. Turn the points adjustment screw until you feel some drag when pulling the matchbook cover out of the gap. An old-timer told me this trick and the dwell turned out at 30 degrees. It's best to set the dwell at the lowest value because timing advances as engine speed increases. Setting the dwell too high will advance the timing too far at high speed and cause power loss.Remember to re-time the engine and set the idle speed after setting the dwell. Turning the distributor doesn't affect the dwell, the dwell affects the timing.My research indicates that the dwell should be checked every 3000 miles, sometimes more. I've seen claims as high as 10,000 miles. You'll have to monitor it yourself and choose the interval that's best.Good luck.
what is The set of all points collinear to two points?
No, but is an infinite set of points.
A set of points on a straight line are called 'collinear points'.
The gas mileage of a farm tractor depends on the model, the year, the condition, and the land driven on. There is no set gas mileage to be expected from a farm tractor.