| 40standardcoupe | -- 08-05-2013 @ 1:05 PM |
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Put on Bob Drakes water pumps and also switched to 6 volt powergen. Powergen suggested tightening up the 5/8” wide fan belt like a new belt – approx. 3/8” deflection and said it would help water pumps to spin better with less slippage. Ran car about 30 miles at highway speed 55 mph and heard a noise and crankshaft pulley broke – see photos. First a chunk came off the pulley and then all spot welds broke and the outer ring broke off. Found NOS pulley, installed it and before I run it, does anyone know if it was the fan belt being too tight that may have caused the pulley to break or something else. If anyone else encountered this problem, what was the fix? Any ideas or suggestions would be greatly appreciated. Also, does anyone know the torque for the crankshaft pulley nut? Would really appreciate your input. Thank you.
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| 40 Coupe | -- 08-06-2013 @ 5:42 AM |
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You may have had a defective pulley that broke under the additional strain, There is no need to tighten the belt as tight as the gen. Mfg. suggest. leaving 3/4 to 1" of belt deflection should be fine.
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| supereal | -- 08-06-2013 @ 3:14 PM |
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It isn't unusual to find cracked crank pulleys . Decades of vibration causes then to break when high belt tension is applied, or the belt doesn't match the pitch of the pulley groove. High output generators require a lot of power, so the manufacturer's instruction is important. We recommend installing the ball bearing water pumps to prevent failure due to high belt loading when we install alternators in old cars. The crank pulley is held in position by a key, so excessive tightening of the crank nut isn't required beyond that to prevent back and forth movement. This message was edited by supereal on 8-6-13 @ 3:17 PM
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