Welding the pulley to the crankshaft would damage it and would prevent future removal.
Pully wobbling could be due to worn seats of the pully and crankshaft seat. Recheck bolt torque to confirm it is not due to it coming loose.
Pully should be running without any wobbling.
The wood ruff key is to hold the crankshaft timing gear and pully in position. It also reinforces the strength of the pully bolt. If it is badly damaged or worn, the bolt would have nothing to assist iin holding the pully in position and sustain the torque. This would result in the pully bolt coming loose or even breaking.
If crankshaft bolts are correctly torqued, we often have problem removing them, unless the bolt breaks, if not it should not come loose. The anticlockwise turning direction of the crankshaft would not cause the bolt ot loosen itself.
To replace the timing belt, the crankpully has to be removed. No short cut around it.
The bolt is under quite a large of torque as it nedds to pull the alternator, Ac compressor and power steering pump.
Monday, August 31st, 2009 AT 11:17 AM