Good morning. I inherited an IH 682 from my B.I.L., which had a replacement engine installed it, but the whole tractor was pretty rough and not operational when I got it. I am closing in on the finishing touches of the frame up rebuild.
Here are the stats for the present situation:
Model 682,
Serial no. 205 0593 U 686311
(w/ original 5 terminal ignition switch & PTO switch, I believe)
Kohler M 18 S engine;
Spec. no. 24506,
Serial no. 2211410856
I utilized the schematic wiring diagram (the 782 w/ M18, below 719.999, as authored by Roland Bedell) for the addition of a relay to account for the newer engine. I am pretty darned sure that I followed the schematic to a “T”, but I may have overlooked something obvious (or maybe not so obvious), even though I double checked things (hmmm - operator error?).
The engine ignition module was replaced with a new one, gapped @ .010, (the median of the .008 & .012 factory specs. for the air gap). Surfaces of it and at the flywheel magnet are clean.
The tractor wiring harness and all of its connectors were examined, and all seem good, tight, and clean. New fuses (10A) were installed @ the 2 dash mounted locations.
The brake/ neutral and seat safety switches are in place and functional.
All connections at the new relay and at the wiring harness splice-in points have been done with heat shrink crimp connectors (either M-F spade terminals, or the M-F bullet type).
The original solenoid near the (new) battery is functional.
New properly gapped spark plugs have been installed.
The PTO engages when switched on.
With the ignition switch in the position 0 (off) position, the ammeter reads near the first (+) tick mark on the gauge.
There is fuel at the carburetor and the engine has fresh (and full) oil.
New wires for the engine oil sentry sending unit have been run and temporarily capped, but not connected (awaiting arrival of the red indicator light).
Everything seems in order; when the system is energized by the ignition switch in position 1 (the run & light switch position), the lights are functional, and the ammeter responds to load. It still seems OK when in position 2 (run), and position 3 (start) is also OK. The starter turns over strong and consistently, but …………I am not getting a spark at the plugs.
Any ideas on the problem, and/ or tests to check things out? Could the regulator/ rectifier be the culprit? Could the stator be suspect?
I probably know “just enough to be dangerous”, but this issue has me baffled. Any suggestions, tips, and/or diagnostic checks/ procedures would be greatly appreciated. It’s time for this Cub to get its second wind and hit the road (or yard, or whatever) again.
P.S. There was a ‘mystery’ toggle switch which I removed; it was in the dash pedestal to the right of the ignition switch. It appeared to be original, along with the hole in the pedestal, but I couldn’t find any reference to it on the forum nor in the IH parts catalog. It had a rectangular body with 6 terminals, and was oriented vertically. The ‘bottom’ 2 terminals were (solder) jumpered horizontally with a wire lead, and the next pair of terminal was the same. This now vacant hole is where the oil indicator light is going to be installed.
Thanks in advance.
Steve Hinrichs, AIA
[email protected]
540 314 2379
