Matt865 Posted January 3 Share Posted January 3 Greetings, everyone. Can the crankshaft woodruff key be extracted without having to remove the crank sprocket? The key was broken when attempting to install an aftermarket pulley. Thank you. Quote Link to comment Share on other sites More sharing options...
bvlenci Posted January 3 Share Posted January 3 Crescent-shaped - negative. Possibly a linear form. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted January 3 Author Share Posted January 3 Is it possible to remove the half moon type without having to remove the chain sprocket? Quote Link to comment Share on other sites More sharing options...
keithmerc220 Posted January 3 Share Posted January 3 If the key is curved, it is likely meant to prevent it from popping out while the pulley is in place. However, this may vary depending on the specific automobile model. Curiously, I just had a similar situation when using my mother's Motability scooter. There is a puncture on the back tyre, which caused a sudden and violent wobble at a speed of 4 mph. It was a frightening experience. The rear drive axle is equipped with curved woodruff keys. In my particular situation, it was necessary to completely remove the wheel in order to reinstall the key. There were no other methods available. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted January 3 Author Share Posted January 3 I was expecting that the half moon, positioned in the shaft, may be dislodged from under the sprocket. Quote Link to comment Share on other sites More sharing options...
bvlenci Posted January 3 Share Posted January 3 Although you may attempt to do so, I anticipate that you will later regret the time you spent on it when dismantling the chain and other components in order to remove the sprocket. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted January 3 Author Share Posted January 3 Indeed, it seems that the process of removing the cam cover to get access to the cam shaft sprockets is fairly laborious. Quote Link to comment Share on other sites More sharing options...
bvlenci Posted January 3 Share Posted January 3 To what extent is the key damaged? Typically, the key is mostly used for alignment purposes rather than for transmitting force. The clamping force exerted by the nut/bolt generates sufficient friction for the sprocket to receive drive from the shaft. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted January 3 Author Share Posted January 3 It seems like the snout and one side have been rounded off, but the photo does not clearly depict this. The pulley was misaligned and caused damage by digging into it. I installed a replacement part that subsequently failed at the key way, which was only discovered as a result of an oil leak. Is it OK to use a new pulley and seal with a torque setting of 220 + 90 degrees? Quote Link to comment Share on other sites More sharing options...
bvlenci Posted January 3 Share Posted January 3 The torque value suggests that the primary force is being exerted by the bolt clamping mechanism. During the disassembly of my smart car's engine, I saw that the cam chain sprocket had a key, but the sprocket located behind it, which is responsible for driving the oil pump, lacked a key and relied only on friction for power transmission. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted January 3 Author Share Posted January 3 Valid observation Quote Link to comment Share on other sites More sharing options...
keithmerc220 Posted January 3 Share Posted January 3 Goodness, who attempted that? Who is Thor? Quote Link to comment Share on other sites More sharing options...
Matt865 Posted January 3 Author Share Posted January 3 Unfortunately, the pulley was not properly aligned and was forcefully attached. Quote Link to comment Share on other sites More sharing options...
AMG33D Posted January 3 Share Posted January 3 The key is engineered to undergo shearing before any catastrophic events occur. It seems that it is almost halfway through this process, therefore I recommend removing it entirely. Additionally, please refrain from forcefully inserting it in the future. Quote Link to comment Share on other sites More sharing options...
AMG33D Posted January 3 Share Posted January 3 Indeed, the shaft is intentionally engineered to undergo shearing in certain circumstances, as an alternative to being splined. Quote Link to comment Share on other sites More sharing options...
AMG33D Posted January 3 Share Posted January 3 Woodruff keys are often referred to as shear pins. Is it possible to divide the chains in order to simplify the task? Quote Link to comment Share on other sites More sharing options...
Rojoires Posted January 3 Share Posted January 3 Only if more than 50% of it protrudes from the sprocket face. It seems that in order to effectively remove the broken key, the drive sprocket will need to be taken off. Quote Link to comment Share on other sites More sharing options...
keithmerc220 Posted January 3 Share Posted January 3 The sprocket has to be removed in order to extract it. By the way, this key with a 'half moon' form is referred to as a Woodruff key. Different shapes of keys are given different names. A cursory examination of this design will indicate that it is impossible to get the desired outcome (in your application) without removing the sprocket. Wishing you the utmost success, please keep us informed on your progress. Quote Link to comment Share on other sites More sharing options...
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