Keyway on crank eating pully slot

kongmen · 03-29-2005, 03:24 AM

1991 corolla. For some strange reason the keyway on the crank shaft keeps chewing up the slot that slides over it that is part of the inside diametor of the crank shaft pully. This is the 2nd crank shaft pully and now it's starting to go. I know this is what it is because when I pulled the 1st pully off the slot was about 3 times as wide as the new one. Any ideas? Keyway worn, bad crank shaft bearings? If it is the keyway anyone know if the keyway is removable? Thanks in advance.

ratboycom · 03-29-2005, 09:44 PM

the woodruff key on the crank is removeable/replaceable, it sounds like either your pully is out of ballance or your thrust bearings are worn causing too much lateral movement in your crank causing the pully to get pulled back and forth by the belts against the crank

ratboycom · 03-30-2005, 01:27 PM

ok, i talked to oneof the masters at my work and he said it could also be, belts to tight, bad crank, crank that is out of balance, one of your main bearing caps could be loose, when the first key way was eaten up it could have taken enough metal off of the crank to make something loose also

automatic · 03-30-2005, 07:13 PM

Besides tearing everything apart to make it "right", I might try and use some industrial (Devcon) epoxy to try and keep any movement from happening and loosening everything up again, a new key also, maybe even an oversized one that you can file to fit tightly into the now distorted keyway. Maybe you can find something that will dissolve in certain chemicals so you could take if off again if needed.
I had a problem with the crank pulley shearing once on an engine that had been balanced at some local machine shop, suspect that was the problem.

fredk · 03-30-2005, 08:45 PM

how tight are you getting the pulley bolt?

kongmen · 04-12-2005, 05:16 AM

Thanks everyone. I put on another pully I'll see how this one does. If this one sheers then I'll look into replacing the dowl pin.

shogun6684 · 06-27-2005, 11:18 AM

I wonder, did changing the pulley again fix the problem or did it still do it? I'm experiencing the same problem. The second pulley, sprocket and woodruff key got worn again. I guess if its a crankshaft problem, the whole engine has to come out huh??

fredk · 06-28-2005, 08:38 PM

how are you tightening the crank pulley bolt?

shogun6684 · 06-29-2005, 08:08 AM

I use like a pry bar to keep the drivebelt pulley from spinning and tighten it that way. Tell me, how should it be tightened? Does that even have an effect on the sprocket inside that's holding the timing belt? Cause that sprocket and the drivebelt pulley is eating out inside. Is the bolt applying pressure to the inside sprocket?, cause of course there is the plastic cover between the bolt and the sprocket.

shogun6684 · 07-25-2005, 05:09 PM

I tightened the pully bolt with an impact wrench now and it seems that my problem hasn't resurfaced yet. Before I was using the impact wrench, the pulley was wobbling, now it spinning straight with the engine running. So hopefully that might be the solution to your problem.

fredk · 07-27-2005, 05:11 PM

there ya go

03-29-2005, 03:24 AM	#1
kongmen New TN User Join Date: Aug 2004 Location: oh Posts: 38 Gameroom cash: $2000 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	Keyway on crank eating pully slot 1991 corolla. For some strange reason the keyway on the crank shaft keeps chewing up the slot that slides over it that is part of the inside diametor of the crank shaft pully. This is the 2nd crank shaft pully and now it's starting to go. I know this is what it is because when I pulled the 1st pully off the slot was about 3 times as wide as the new one. Any ideas? Keyway worn, bad crank shaft bearings? If it is the keyway anyone know if the keyway is removable? Thanks in advance. Last edited by kongmen; 03-29-2005 at 03:28 AM.

03-30-2005, 08:45 PM	#5
fredk JUST RE ENGINEER IT Join Date: Nov 2004 Location: Eureka UT. Posts: 2,957 Gameroom cash: $14510 Thanks: 0 Thanked 1 Time in 1 Post iTrader Score: 0 reviews	how tight are you getting the pulley bolt? __________________

06-28-2005, 08:38 PM	#8
fredk JUST RE ENGINEER IT Join Date: Nov 2004 Location: Eureka UT. Posts: 2,957 Gameroom cash: $14510 Thanks: 0 Thanked 1 Time in 1 Post iTrader Score: 0 reviews	how are you tightening the crank pulley bolt? __________________

06-29-2005, 08:08 AM	#9
shogun6684 The Cellist Join Date: Feb 2005 Location: btwn Virgin Islands & Connecticut Posts: 53 Gameroom cash: $2100 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	Hmm I use like a pry bar to keep the drivebelt pulley from spinning and tighten it that way. Tell me, how should it be tightened? Does that even have an effect on the sprocket inside that's holding the timing belt? Cause that sprocket and the drivebelt pulley is eating out inside. Is the bolt applying pressure to the inside sprocket?, cause of course there is the plastic cover between the bolt and the sprocket. Last edited by shogun6684; 06-29-2005 at 08:11 AM.

07-27-2005, 05:11 PM	#11
fredk JUST RE ENGINEER IT Join Date: Nov 2004 Location: Eureka UT. Posts: 2,957 Gameroom cash: $14510 Thanks: 0 Thanked 1 Time in 1 Post iTrader Score: 0 reviews	there ya go __________________

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03-29-2005, 09:44 PM	#2
ratboycom Official TN Member Join Date: Sep 2004 Location: Spokane, WA USA Posts: 145 Gameroom cash: $1500 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	the woodruff key on the crank is removeable/replaceable, it sounds like either your pully is out of ballance or your thrust bearings are worn causing too much lateral movement in your crank causing the pully to get pulled back and forth by the belts against the crank

03-30-2005, 01:27 PM	#3
ratboycom Official TN Member Join Date: Sep 2004 Location: Spokane, WA USA Posts: 145 Gameroom cash: $1500 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	ok, i talked to oneof the masters at my work and he said it could also be, belts to tight, bad crank, crank that is out of balance, one of your main bearing caps could be loose, when the first key way was eaten up it could have taken enough metal off of the crank to make something loose also

03-30-2005, 07:13 PM	#4
automatic Official TN Member Join Date: Jun 2004 Location: Seattle Posts: 160 Gameroom cash: $2200 Thanks: 0 Thanked 1 Time in 1 Post iTrader Score: 0 reviews	Besides tearing everything apart to make it "right", I might try and use some industrial (Devcon) epoxy to try and keep any movement from happening and loosening everything up again, a new key also, maybe even an oversized one that you can file to fit tightly into the now distorted keyway. Maybe you can find something that will dissolve in certain chemicals so you could take if off again if needed. I had a problem with the crank pulley shearing once on an engine that had been balanced at some local machine shop, suspect that was the problem.

04-12-2005, 05:16 AM	#6
kongmen New TN User Join Date: Aug 2004 Location: oh Posts: 38 Gameroom cash: $2000 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	Thanks everyone. I put on another pully I'll see how this one does. If this one sheers then I'll look into replacing the dowl pin.

06-27-2005, 11:18 AM	#7
shogun6684 The Cellist Join Date: Feb 2005 Location: btwn Virgin Islands & Connecticut Posts: 53 Gameroom cash: $2100 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	I wonder, did changing the pulley again fix the problem or did it still do it? I'm experiencing the same problem. The second pulley, sprocket and woodruff key got worn again. I guess if its a crankshaft problem, the whole engine has to come out huh??

07-25-2005, 05:09 PM	#10
shogun6684 The Cellist Join Date: Feb 2005 Location: btwn Virgin Islands & Connecticut Posts: 53 Gameroom cash: $2100 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Score: 0 reviews	I tightened the pully bolt with an impact wrench now and it seems that my problem hasn't resurfaced yet. Before I was using the impact wrench, the pulley was wobbling, now it spinning straight with the engine running. So hopefully that might be the solution to your problem.

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