8n no start

[waylon miller]

I have a 49 8n that won't start. It got where after it warmed up, it had to spin over several times before it would start. And now it will not start at all. I was it has a front mount distributor. And I know I am not getting fire. What are the specs for the resistor and how do you test it, or the coil? I checked the points and they are fine.

 

[Bruce (VA)]

6v or 12v? It could make a difference in troubleshooting.

First, check for continuity inside the distributor w/ a meter or test light.. It is very easy to ground the wire to the condenser when you replace the points. Check the point gap, .015 on all four lobes. Points do slip closed! And, as I know from personal experience, the rubbing block on some of the ‘made overseas’ points do wear out sooner than you would expect. Make sure you have the star washer under the screws on the points.

Next, with the distributor still off the tractor, install the coil. Test for continuity from the top of the coil to the points. If you do not have continuity, stretch the pigtail a bit until you do.

There is no way to test the coil unless you have some very old testing equipment; it either works or it doesn't. As to the resistor, if you have p/n 12250 (the resistor on the terminal block) it should read .3 ohms cold & 1.7 ohms hot. I'm not sure of the value for p/n 12250B, the other resistor, which is probably on your tractor.

Post back w/ results & any other questions.

Merry Christmas!
50 Tips

 

[Dell (WA)]

Waylon........you write......"What are the specs for the resistor and how do you test it"........normally you test a resistor with an "Ohm-meter", isn't that amazing???

Unfortunately, the 0.3-to-1.7 ohm temperature variable range of the infamous ballast resistor takes LAB grade ohm-meter to measure with accuracy. But surprizingly enuff, even the cheapest voltmeter will read the voltage drop of 0.3-to-1.7 ohms with great enuff accuracy. The nominal resistance of 1.4-ohms should read about 3.0 volts at the top of the 1-terminal squarecan ignition coil ontop frontmount distributor. Isn't that eazy???

Me? Based upon yer vague complaint of hard starting after warm-up, I'd suggest yer weaksister ignition switch is BAD. $10 (cheap)........Dell, yer self-appointed sparkie-meister

 

[Tom N MS]

Are you getting fire to the coil? "checked the points and they are fine" How did you check them to determine "they are fine"??

 

[waylon miller]

yes, I am getting ignition switch power to the top of the coil, and I checked the point gap and it is within specs.