Primary side engine sprocket removal

Maxxfli · Feb 18, 2010

Hey is there a trick to removing the woodruff key? Ive been trying to work mine out for the last hour and it wont budge. I hit the crankshaft with some heat and i soaked it in pb. Should i hit it with a punch on the on the spacer side?

Maxxfli · Feb 18, 2010

Nevermind. Looks like im going to have to replace the woodruff key.

pantah_good · Jun 4, 2016

This old thread was very helpful. Mine was stuck pretty bad, as was the alternator rotor spacer just outboard of the sprocket. I finally had to bench grind an "eyeballed" 60 degree chamfer on the end of the main puller screw so it would stay engaged on the end of the crank, and used molly grease on everything. On the last try, everything was starting to get a little cock-eyed from getting really tight, when it all finally POPPED loose. Thanks for all the suggestions.
Bill

freefly103 · Jun 5, 2016

Blow torch the sprocket and when ready to use the puller, freezer spray on the shaft.

JimNH · Jun 5, 2016

OT but:

I was pulling a gear off a tractor. Big puller, long bar on breaker bar, lubed threads on puller, grade 8 pulling bolts, cherry red heat, worked at it way into the night, - no luck, gave up, locked the shop and went to bed.

I found the whole mess on the floor the next morning; must have scared the crap out of the mice.

pantah_good · Jun 5, 2016

Freezer spray - of course - I'll have some on hand next time around.

Roadrash · Jun 5, 2016

Just to share different ways... an impact driver on the puller bolt is what finally got mine to release.

J. M. Leadbeater · Jun 5, 2016

Use the correct puller...tighten it up as tight as you can then hit the end of it with a 4 lb hammer BUT DONT STAND IN THE WAY OF IT as it becomes a high speed missile OR have anything you treasure in the line of fire. Yee gids dont people serve proper 5 year Engineering apprenticeships and learn such tricks any more?

MFB · Jun 5, 2016

Can't recall having too much trouble with that sprocket. I use a home made puller. Yes, it locks on tight to the taper.
As a general rule on these types of jobs, I always find heat to be the trump card, it always wins. In conjunction with a hairy-chested puller of course, and a whack if necessary.
Penetrating oil? Dubious but why not, it may help.

acotrel · Jun 5, 2016

You should not have to heat the sprocket unless it has been put on with Loctite. I usually tighten the puller onto the sprocket and shaft so that the spring in the puller is taken up, then give a tap on the centre bolt of the puller. It Loctite has been used and you manage to get the sprocket off by forcing it, you can bring metal off with it. Slight heat will unlock Loctite, so if you really cannot move it fairly easily heat it up a bit. You probably know the history of your bike and where you have used Loctite ?

Primary side engine sprocket removal

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