Driver coil question - 1976 9.9

[Dale in MD]

The driver coil under my flywheel has a green paint-like coating on it. Is it there for electrical insulating purposes? I've lost spark after replacing condensors. One of the things I had done while I was in there was "cleaned up" the driver coil where it mounts such that it is now definitiely being grounded where it mounts.

Is it Ok that the driver coil (laminated plate section) is grounded or should it be insulated from ground? Its gounded where the two bolts mount it to plate.

See attached pic.

Dale

 

[F_R]

Re: Driver coil question - 1976 9.9

It would be virtually impossible to prevent grounding, even if you tried to. Grounding is not an issue.

Edit: Just for informational purposes, the individual laminated plates are more or less insulated from each other to prevent magnetic eddy currents. Not something you have to be concerned about though, unless it is a ball of rust.

You should be sure to adjust the coil so the laminations are flush with the machined edges on the armature plate.

 

[Dale in MD]

Re: Driver coil question - 1976 9.9

Thanks - I figured as much.

OpsyEagle and i seem to be battling with similar motors. Here is where i'm at (after 2 weeks) with mine.
New plugs - .030"
Points clean and at .020"
New wires.
Both external coils have what I believe are good resistance readings with no shorts to ground - even when heated. 1.4 ohms primaries and about 13k secondaries.
Replaced both condensors.
Driver coil resistance good at 1.48 ohms.
No grounds in wiring harness. No broken wires. Unplugged kill switch.
Plate the points mount to has very little play.

At one point, it would run on 2 cylinders if I kept rpms up, but would eventually drop to single cylinder even at WOT.

Now - I have no spark at all - yet everything seems to check out (continuity / resistance).

Test ran it 2 days ago - could only get single cylinder. Went out in dark to start it and look for arcing and it wouldn't fire. Swapped plugs, moved wires, etc - zero spark. Guess plugs could have somehow fouled, but seems unlikely and they are very clean looking and are basically new.

I have to think I have something that doesn't show up as a ground on the meter, but will break down when voltage is applied.

I'm about ready to use it as an anchor. Any thoughts /things to check would be appreciated. I can send pics or whatever data needed. I have it aoart with iginition plate off now....

Dale