The Crankshaft question continues

Submitted: Friday, Jan 07, 2005 at 02:02

ThreadID: 19134 Views:1687 Replies:6 FollowUps:3

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andrewhamilton

Ok...

Its been a week or so trying to fix this bugger.

The pulley came off while coming home from holidays. The key was lost and the keyway badly damaged.

See pic here http://backyardmissionary.typepad.com/backyardmissionary/images/crank1.jpg

It is an old car worth $3 or 4 K so I have tried to use devcon to repair the keyway rather than a whole crankshaft fix. The first devcon repair didn't hold. I discovered it had failed when I had to pull the whole lot off to replace the timing cover gasket.

Today I re-'devconed' it but I have very little faith that it will work.

I am wondering if I can weld the key in place, grind it back sufficinetly and then slot the balancer over the whole lot?

Anyone done this successfully?

Another thought was to drill two holes in the crank where the keyway is and slot in 2 high tensile 'dowels' to use as a key.

Right now I am open to all suggestions as pulling the motor out and repairing the crank is not looking like a possibility.

Any thoughts?

Thanks to all who have contributed so far!

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Reply By: dashpod - Friday, Jan 07, 2005 at 07:09

Friday, Jan 07, 2005 at 07:09

yes andrew because of the torsional vibrations of the crankshaft any movement of the pulley on the shaft will destroy the woodruff key.i have never tried it but your idea of drilling between the shaft and pulley and fitting a dowel could work but if it doesn't it means a new shaft..cheers albert

AnswerID: 91714

Reply By: bundyman - Friday, Jan 07, 2005 at 08:01

Friday, Jan 07, 2005 at 08:01

Andrew I'd go the weld/grind option as a cheap fix, but as previously mentioned you'll need to watch heat build up in the crank damaging your seals. Good luck.

Cheers,
Hughesy

AnswerID: 91718

Reply By: GaryInOz (Vic) - Friday, Jan 07, 2005 at 15:57

Friday, Jan 07, 2005 at 15:57

Mill another keyway??? May be better to "start afresh".

AnswerID: 91789

Follow Up By: andrewhamilton - Friday, Jan 07, 2005 at 16:02

Friday, Jan 07, 2005 at 16:02

could i do this on the reverse side without much drama?

would it throw the timing out?

FollowupID: 350590

Reply By: Truckster (Vic) - Friday, Jan 07, 2005 at 16:01

Friday, Jan 07, 2005 at 16:01

How much is another 2f? or 350 chev?

AnswerID: 91791

Reply By: andrewhamilton - Friday, Jan 07, 2005 at 17:03

Friday, Jan 07, 2005 at 17:03

I looked at that - but we're talking $2000 ish with fitting

AnswerID: 91804

Follow Up By: Truckster (Vic) - Saturday, Jan 08, 2005 at 00:40

Saturday, Jan 08, 2005 at 00:40

Fit yourself.
Kennards for a tripod or engine crane, 1 weekend and you should be driving away....

bodging it up, will lead to nightmares when you can least afford it... You would bash yourself over not spending that $1500 for the other donk.. cause it would be about $500 fitting?

FollowupID: 350681

Reply By: Eric Experience. - Friday, Jan 07, 2005 at 22:48

Friday, Jan 07, 2005 at 22:48

Andrew.
We need to establish why the pulley became loose in the first place. Check that the screw is not bottoming out in the crank, this can happen if the washer is not the original thickness. the other possibility is that is not being tightened enough, the key is there to act as a reference it is not intended to drive the pulley the friction of the pulley on the shaft drives it. The only timing problem you will have is the mark on the pulley. After you sort out the original problem, get some super strength locktite and primer and follow the instructions. the torque on the screw usualy reqiures the car in 5th with the hand brake on hard and pull on the screw until the car starts to move.
Eric.

AnswerID: 91866