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So what's the deal with woodruff keys?
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11-10-2004, 12:53 PM
So, having lost the woodruff key that keeps the crank pulley turning with the crankshaft, I began to ponder... Why is it there? Is it to provide a point of failure between the crankshaft and the accessories? To avoid the potential for damage to the crankshaft (and hence avoid having to dissasemble the engine if the theres an issue with the pulley)... I dunno - Discuss.
My two feet.
11-10-2004, 01:11 PM
To keep the pulley from rotating around the crank...
I assume your cam gears have them as well.
11-10-2004, 01:13 PM
so teh pulley and crank stay in sync.
I Am Mike
4 wheels: '01 RAV4 (Formerly '93 Civic CX, '01 S2000, '10 GTI, '09 A4 Avant) 2 wheels: '12 Surly Cross-Check Custom | '14 Trek Madone 2.1 105 | '17 Norco Threshold SL Force 1 | '17 Norco Revolver 9.2 FS | '18 BMC Roadmachine 02 Two | '19 Norco Search XR Steel (Formerly '97 Honda VFR750F, '05 Giant TCR 2, '15 WeThePeople Atlas 24, '10 Scott Scale 29er XT, '11 Cervelo R3 Rival, '12 Ridley X-Fire Red) No longer onyachin. 
11-10-2004, 01:18 PM
So I'm assuming you're going to get another one?
When it comes to Ryan Jenkins, the story ends with me putting him in the wall.
2009 Speed Triple | 2006 DR-Z400SM | 1999 CBR600F4 | 1998 Jeep Cherokee -Ginger
11-10-2004, 03:03 PM
.RJ Wrote:To keep the pulley from rotating around the crank... MichaelJComputer Wrote:so teh pulley and crank stay in sync. Yeah thanks guys, I'm aware of that reason. Guess I didn't phrase the question very well - why isn't there a raised key on the crankshaft as opposed to the little woodruff key? Why is the woodruff key a separate piece?
My two feet.
11-10-2004, 03:06 PM
.RJ Wrote:I assume your cam gears have them as well. Nope. The cam shafts have a keyed endplate that mates with the cam sprockets and keeps the whole assembly in sync.
My two feet.
11-10-2004, 03:07 PM
mongooze Wrote:why isn't there a raised key on the crankshaft as opposed to the little woodruff key? Why is the woodruff key a separate piece? Probably cheaper to do it that way.
11-10-2004, 04:44 PM
Maybe it's also separate because then, a builder can replace the keys. I've actually never known any to do that, but maybe in older cars, it would be a good idea. Also, I'd imagine they could be made stronger and like RJ said, cheaper, than if it had to be machined from the crank or cast with it. But in keeping with your initial insights, I actually saw a Miata with the crank snout snapped out. Amazingly, the crank pulley was still sitting inside the engine bay, and not thrown out like a bullet.
Two feet.
11-10-2004, 06:59 PM
jackstands Wrote:I actually saw a Miata with the crank snout snapped out.common problem with they early miatas they had a shortnose-crank
11-11-2004, 08:01 PM
Evan Wrote:jackstands Wrote:I actually saw a Miata with the crank snout snapped out.common problem with they early miatas Jesus, that's common.
Two feet.
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