So I havent checked the ohms on these yet but they have some rust, and one has a crack in the caseing. i have been having problems at wot and believe these are probably the culprit.
Replace. Mine had a crack in the casing and it caused me to drop a cylinder at wot. At least you'd know it was not the problem. Mine also passed the ohm test btw but that ended up being the problem.
yea, the center coil has a small crack in it. and i figured all the rust on the laminated plates would cause alot of resistance at wot. thanks yall. any suggestions on where to purchase?
Unlike the old (i.e. 1950s) coils, external cracks on those type of coils don't necessarily indicate an insulation breakdown. Those coils are constructed using an ignition coil that is placed within a potting case then filled with encapsulent. The cracks evident externally on those coils only indicates cracks in the potting cases. What would be more important is the integrity of the internal coil magnet wire and potting encapsulent.
I had a 70's V4 that used those type of coils. When I bought the motor, it had cracks all over the potting cases. Just to be safe I coated the cases & cracks with electrical grade epoxy. They worked like a charm. I'm not too sure they wouldn't have worked fine without the additional epoxy.
This is not to say your coils can't be bad. I'm just saying that those visible cracks are not an indication of an insulation breakdown - at least not on that style of coil.
Gotchya, I wasnt as concerned about the cracks as I am the rust. in one of the pictures, the plates are actually pushed apart by it. After all, the thing sat for 10 years!
The only proper way to check those coils is to take them into a shop that has a coil tester and have them Load tested. They can check them for any high voltage leaks. As said above, the cracks may only be facial.
