Flywheel rubbing ignition coil

[spareparts]

break clean will dissolve a lot of that stuff, just epoxy teh magnets back in plae, if you have to use a spacer, cut some out of wood to keep the magnets in their proper place

[spareparts]

see if you can move the crank side to side, it can damage an upper crank bearing as well

[Destroyer]

Originally Posted by spareparts

see if you can move the crank side to side, it can damage an upper crank bearing as well

Crank was solid.. tried moving it last night. I did notice that the groove for the keyway in the crankshaft looked very shallow. (meaning that the key looked like it was thinner than the keyway in the flyway). Is that usual? I'll take some depth readings tonight of the keyways.

[spareparts]

it aint much of a key way

[THEFERMANATOR]

Originally Posted by spareparts

it aint much of a key way

No, and the keyway is pretty soft as well. Make ABSOLUTELY certain that the crank and flywheel are as clean as possible before you torque the flywheel down or else it will shear the keyway off first time you get on plane(don't ask how I know).

[Destroyer]

Originally Posted by THEFERMANATOR

No, and the keyway is pretty soft as well. Make ABSOLUTELY certain that the crank and flywheel are as clean as possible before you torque the flywheel down or else it will shear the keyway off first time you get on plane(don't ask how I know).

Good to know..thanks for the info. It looked a little thin to me.. I'm used to seeing industrial keyways with half the key in each slot.. This one didn't look right at all.

[spareparts]

Originally Posted by THEFERMANATOR

No, and the keyway is pretty soft as well. Make ABSOLUTELY certain that the crank and flywheel are as clean as possible before you torque the flywheel down or else it will shear the keyway off first time you get on plane(don't ask how I know).

what he said!

[Destroyer]

Ok...got to thinking... the score marks on the inside of the flywheel are even all the way around... no mark is deeper than any other mark...and the groove is the same depth all around. If the crankshaft snout was bent so there was runout then one side of the marks on the flywheel would be deeper than the opposite side from hi-low flutter. That's not the case here. So then I put an indicator on the snout, put the engine in gear and using the prop turned the engine a few revolutions. No detectable runout on the stub.

Only one of the coils has rub marks on it. The spark coil closest to the boat hull. (There are 3 spark coils, 1 in the front of the engine and 2 that are 180 degrees from the first one at the back of the engine). Is it possible that the front coil is somehow high?? Is that even possible?

Although the groove and marks in the flywheel appear to be bright metal, it's possible that this damage is old. Upon inspecting the flywheel I can see that a few of the magnets have been re-glued, so there was obviously a problem some time in the past. Only thing I can think of to do next is put Dykem on the top of the coil, remount the flywheel and spin the engine a few times, then take the flywheel back off and see if the Dykem was rubbed off. If it was then I know that it's hitting. If it's not then maybe this is all from the PO and it's a non issue. I'm totally stumped on this one. Aside from the gumming issue the engine runs strong. I just want to keep it that way.