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My 402 is assembled and resting on the stand. The builder put only one key in the hub. I want to add a second key.
I can't think of a way to brace or hold the crank without having a flywheel in place and the ability to secure it like I would at the starter location with a screw in key.
Also. Since I have never worked with keys are they all uniform, or do I buy a blank and then have to machine it to fit?
Crank keyways come in various sizes, usually 1/4”. I’ve had many added, some on cranks, and other various shafts and collars. I do not know of any added to a completed engine though.
If you want two keyways go for it, but my guess is you’ll need to remove the crank so it can be machined.
"Pinning" and "Keying" achieve the same thing. Pin is a round dowel and key is a rectangular. The kits you see are for "pinning" because no one has a square drill bit lol. Typically keys and keyways do not require custom machining to fit. They come in "nominal" sizes...most common is 1/4" I believe
Two bolts in the crank and a prybar can keep motor from turning. I'd be cautious not to damage crank threaded holes. Screw long bolts all the way in for full thread engagement.
Last edited by smitty2919; Mar 29, 2022 at 11:22 AM.
I've used a combination wrench and two flywheel bolts in the crankshaft. Put one flywheel bolt through the box end of the combination wench into the hole in the crank. Put the other flywheel bolt in an adjacent hole. Using a wrench this way, it's much less likely to slip than a pry bar. If you need more leverage, use a bigger combination wrench and a washer (even a fender washer) to keep it from slipping off.
Oh, and one more thing, often it's possible to put the open end around a bolt sticking out of one of the bell housing bolt holes, or around the bolt holding the engine to the stand. That way you're pushing against hard metal and not trying to hold it with your muscles.
Pulling Balancer without flywheel?
