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ChevLoRay · 10-23-2011, 05:03 PM

My son has a '91, with the 4.3/automatic. I think his harmonic balancer is bad. When the engine is cold, it is quiet. When it has warmed up, there's a knocking sound that isn't a bearing. I'm thinking the balancer is the source of the noise. He's down on money, so I'm trying to offer free suggestions so he won't do something stupid...well, anything else stupid.

Any easy way to know that the balancer is the issue?

10-23-2011, 05:03 PM	#1
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	'91 4.3 question - harmonic balancer My son has a '91, with the 4.3/automatic. I think his harmonic balancer is bad. When the engine is cold, it is quiet. When it has warmed up, there's a knocking sound that isn't a bearing. I'm thinking the balancer is the source of the noise. He's down on money, so I'm trying to offer free suggestions so he won't do something stupid...well, anything else stupid. Any easy way to know that the balancer is the issue? __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.