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no start after coil and distributor overhaul


 
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hubbellhill
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Joined: 25 Aug 2008
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PostPosted: Tue Jul 08, 2014 7:13 am    Post subject: no start after coil and distributor overhaul Reply to specific post Reply with quote

After good advice that my coil may be bad I went ahead and
replaced it: series of events as follows: removed distributor,
replaced condenser, checked condition and gap of points, they
looked fine so left them alone. Replaced coil with new one,
replaced distributor cap with new one, replaced all spark plug wires
with new ones.. Re-installed distributor with new coil, attached wire
to coil, turned key: pressed starter button No spark, not starting. (Gas is flowing to carb) 6volt front mount 1940
9n.. ran fine prior to me messing around with it, other than the coil possibly over heated
when brush hogging high grass.. Help I"m up to my elbows in
grease and the grass is getting high again!
 
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Bruce (VA)
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Joined: 24 Feb 2003
Posts: 12871
Location: Old Church VA

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PostPosted: Tue Jul 08, 2014 7:22 am    Post subject: Re: no start after coil and distributor overhaul Reply to specific post Reply with quote

Put the battery on a charger. You need a strong battery to:

1. Spin the starter

2. Engage the bendix

3. Provide voltage to the coil.

The more current you use to spin the starter, the less you have for the ignition.

Assuming that the bushings & advance weights are ok (*see below), & that you have correct voltage to the coil (battery voltage with the points open and about half that with the points closed), the most common electrical failure (no spark, weak spark) points on the front mount are:

1. The insulator under the brass concave head screw & where the copper strip attaches. (it’s fiber & will wear out; poke & prod w/ your meter leads to make sure it still works) If you need to replace the insulator, use a .250 x 3/8 nylon square nylon anchor nut available at most big box home stores

2. The pigtail at the bottom of the coil not making contact w/ the concave head brass screw inside the distributor. (With the coil on, the pigtail must firmly contact the brass screw. No contact = no spark

3. The copper strip is broken or grounded to the plate. (look very carefully for cracks & breaks).

4. The condenser wire grounding to the plate or side of the distributor.

5. The tab on the bottom of the coil not making contact w/ the brass button on the cap. (With the cap on, the tab must firmly contact the brass button. No contact = no spark.)

6. Incorrect positioning of the spring clip on the plate causing the pigtail to ground. (the open part of the clip goes between 7 & 9 o’clock on the plate. That puts the straight part of the clip opposite of the timing screw at 3 o’clock)

7. Incorrect seating of the coil on the distributor due to a loose bail or no gasket.(the coil must not move at all; if it does, replace the gasket or bail. Or stick some cardboard under the bail).

8. Water/moisture inside the cap due to gasket failure or the absence of a gasket. (the cap AND coil have gaskets)

9. Dirty/corroded/burned/incorrectly gapped or misaligned points. I use only Wells, Blue Streak or Echlin brand points (* *see below).

10. Burned rotor, cracked/carbon tracked cap.

After find the problem & re-check the point gap, do a continuity check before you put the distributor back on the tractor. Before you start, make sure your meter/light works.
With the distributor still off the tractor, follow these steps:

1. Coil off, cap off, points open. One probe on the brass screw & the other on both sides of the open points. On the side closest to the cam, you should have continuity. Not on the other side! If you do, you will also have continuity everywhere because the points are grounded.

2. Coil off, cap off, points open. One probe on the brass screw & the other anywhere on the body of the distributor. You should have no continuity! Now, rotate the tang on the distributor....as the points open & close, you have continuity (closed) and lose it when they open.

3. Put the coil on the distributor, cap off, points open. One probe on the lead on the top of the coil, the other on the cam side of the open points. You should have continuity!

4. Coil on, cap off, points open. One probe on the lead on the top of the coil, the other anywhere on the body of the distributor. You should have no continuity!

At this point, I just put the distributor, coil & cap all back on the tractor as a unit. The reason I do this is because it is real easy to get the cap or coil misaligned trying to put it back together, one piece at a time. The result is something gets broken or you get a ‘no spark’ problem.

It's possible to put it back on wrong & break it. Look at the slot on the end of the cam shaft. Whatever angle it happens to be, turn the distributor tang to match it. Make sure you can tell the wide side from the narrow side on both the cam & distributor! (close counts). Place the distributor on the front of the engine, gently push it in place & slowly turn the distributor body until you feel the tang slip into the slot. Rotate the distributor body until the bolt holes line up. Hand tighten the two bolts until the distributor body is flush with the timing gear cover.

Plz post back w/ results or more questions.


* Unscrew the plate hold down screw & remove the C clip to get the plate out. Remove the shaft & weights. The weights should freely move.


* *NAPA part numbers:
• Points: FD-6769X
• Condenser: FD-71
• Rotor: FD-104
• Cap: FD-126
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hubbellhill
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PostPosted: Mon Jul 14, 2014 4:26 pm    Post subject: Re: no start after coil and distributor overhaul Reply to specific post Reply with quote

Thanks for the great advice. Running again! turned out the points were a little off gap, and the "new' rotor that came with the cheap-o tune up kit was no good replaced the new with the old rotor and with the help of a great local mechanic and your trouble shooting we are back in the fields.
 
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Bruce (VA)
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Joined: 24 Feb 2003
Posts: 12871
Location: Old Church VA

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PostPosted: Mon Jul 14, 2014 4:32 pm    Post subject: Re: no start after coil and distributor overhaul Reply to specific post Reply with quote

You're welcome. Glad to help.

and thanks for the follow-up.
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