unknown knock - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stepside68longbed · 04-15-2014, 06:59 PM

I have a 68 307 with an auto 350 trans. there's a knocking noise coming from the front near all the pulleys.. I have the main drive pulley, fan, and alt. I've checked the fan it doesn't wobble and isn't loose, I checked my temp with a thermometer registered just over 150 so I figure the water pump is fine. the main drive pulley looks like it wobbles n so does the fan its hard to tell which one it really is with it all tied together.. I already took the plug wire out one by one and it still knocked it sounds like its from the front...

any suggestion? or troubleshooting?

04-15-2014, 06:59 PM	#1
stepside68longbed Registered User Join Date: Mar 2014 Location: Atlanta GA Posts: 94	unknown knock I have a 68 307 with an auto 350 trans. there's a knocking noise coming from the front near all the pulleys.. I have the main drive pulley, fan, and alt. I've checked the fan it doesn't wobble and isn't loose, I checked my temp with a thermometer registered just over 150 so I figure the water pump is fine. the main drive pulley looks like it wobbles n so does the fan its hard to tell which one it really is with it all tied together.. I already took the plug wire out one by one and it still knocked it sounds like its from the front... any suggestion? or troubleshooting?



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