Been fighting backfire/timing problems with my '93 SP. Tonight I pulled the MAG cover and hand turned the crank nut off. The woodruff key was pulverized and the groove in both the magneto and the crankshaft show some wallowing. Anybody have any experience making a repair on something like this? I'm thinking welding or brazing a new key and using a key cutter to clean up the magneto and the crankshaft groove as much as possible.
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Crankshaft woodruff key repair
- Thread starter Keith1
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You'll need to remove the flywheel with a three slot auto puller with 4" long metric
bolts with a heavy washer on each and a Big breaker bar to "POP" off the flywheel.
remove all the bits from stator, flywheel & crank, install a new woodruff key. You
might want to remove the starter because bits can get in there too. Bits can
ruin a stator.
bolts with a heavy washer on each and a Big breaker bar to "POP" off the flywheel.
remove all the bits from stator, flywheel & crank, install a new woodruff key. You
might want to remove the starter because bits can get in there too. Bits can
ruin a stator.
Bills86e,
He already has the flywheel off.
Keith1,
Post some pictures. I assume the damage is extensive. If so, you will have to replace the flywheel and, at a bare minimum, replace the end of the crankshaft. The flywheel and crankshaft tapers must be in perfect condition. In reality, it's the tight tapered fit of the flywheel to the crankshaft that prevents the flywheel from spinning on the shaft. The woodruff key is there for timing purposes. It's to make sure you put the flywheel on in the proper position in relation to the crankshaft. Also, whenever you remove and re-install a flywheel, you should lap it in with valve lapping compound to get a perfect fit.
Chester
He already has the flywheel off.
Keith1,
Post some pictures. I assume the damage is extensive. If so, you will have to replace the flywheel and, at a bare minimum, replace the end of the crankshaft. The flywheel and crankshaft tapers must be in perfect condition. In reality, it's the tight tapered fit of the flywheel to the crankshaft that prevents the flywheel from spinning on the shaft. The woodruff key is there for timing purposes. It's to make sure you put the flywheel on in the proper position in relation to the crankshaft. Also, whenever you remove and re-install a flywheel, you should lap it in with valve lapping compound to get a perfect fit.
Chester
Here's some pictures. I like the idea of lapping both the crankshaft and the flywheel. I may try to bluecheck the fit once I figure out a fix. As I look closer I think I'll replace the flywheel and at least start with one good part. Thanks for the input so far.
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timmyboy76
New Member
not bad doc...no all da triks.
That's why they pay me the big bucks. lol
Machining a new groove is one option, but I am trying to do an "in the boat" repair. This is 16 year old all original motor. If I pull the motor I will do a full rebuild, crank, pistons, seals, etc. I just need fix to make last a little bit longer than the next component to fail.
Keep the ideas coming!
Keep the ideas coming!
Well, you can figure out some improper way to rig it and get it to run a little bit but you're just going to end up messing something else up in the process and end up spending more money in the end. There are some repairs that can be done on the fly and get you up and rolling until a full and proper repair can be done but this is not one of them.
ski-d00
Well-Known Member
I understand about old boats and not wanting to spend more money than is needed and coming up with cost effective good solutions, not rigs. If you are skilled with a dremel tool, you can clean up and cut a slightly larger groove for an oversized woodruf key. Actually, I've heard of people removing the key all together and relying on red loctite and a good press fit and it working, but certainly don't recommend that.
robin savell lloyd
Active Member
Very good point Chester I wander how many people will believe this [fact] [The flywheel and crankshaft tapers must be in perfect condition. In reality, it's the tight tapered fit of the flywheel to the crankshaft that prevents the flywheel from spinning on the shaft.] I can always be wrong so listen to the pros. Robin :cheers:
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