1997 4.3 is a knocking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

4x4k30 · 10-31-2015, 10:04 PM

I just bought a 97 Cheyenne 1500 with the 4.3 vortec it sounds like a rod is loose and causein the knock but after checking around it sounds like it could be a lifter I took off the rt valve cover and looked at the rockers it looks ok the rocker arms are tight they have no adjustment any ideals whats up with it?

**jayoldschool** · 10-31-2015, 10:07 PM

Loose rocker sounds a LOT different than rod knock. If you popped off a cover and none of the rockers are loose, start digging deeper. Cheap and easy to swap the engine out...

speedygonzales · 11-01-2015, 08:39 AM

Did you roll over the engine while "looking" at the rocker arms?

4x4k30 · 11-01-2015, 09:08 AM

Quote:

Originally Posted by speedygonzales

Did you roll over the engine while "looking" at the rocker arms?

yes I can run the engine I have only just removed the rt valve cover and the rockers are tight it sounds like the noise is the on the rt side I will pull left cover and check it next

speedygonzales · 11-01-2015, 01:48 PM

I understand you can run it. You didn't understand my question. Yeah the rockers are tight that you looked at. But if you "roll" the engine around by hand with valve cover off, you may find the rockers that were down at the time you looked, could now be loose once they are up. You may also find some are not going all the way down when they should because of a collapsed lifter.

Merely looking under the valve cover without rotating the engine only gives you a small portion of the puzzle. You have to see the rocker arms in motion.

10-31-2015, 10:04 PM	#1
4x4k30 Registered User Join Date: Jun 2003 Location: ga Posts: 630	1997 4.3 is a knocking I just bought a 97 Cheyenne 1500 with the 4.3 vortec it sounds like a rod is loose and causein the knock but after checking around it sounds like it could be a lifter I took off the rt valve cover and looked at the rockers it looks ok the rocker arms are tight they have no adjustment any ideals whats up with it? __________________ 4x4k30 if trouble was money i would have plenty

10-31-2015, 10:07 PM	#2
jayoldschool Moderator Join Date: Dec 2012 Location: ON, Canada Posts: 2,152	Re: 1997 4.3 is a knocking Loose rocker sounds a LOT different than rod knock. If you popped off a cover and none of the rockers are loose, start digging deeper. Cheap and easy to swap the engine out...

11-01-2015, 08:39 AM	#3
speedygonzales Registered User Join Date: Jan 2006 Location: Smithfield, VA Posts: 1,501	Re: 1997 4.3 is a knocking Did you roll over the engine while "looking" at the rocker arms? __________________ 99 Z71 (98 body style) Pride and joy

11-01-2015, 01:48 PM	#5
speedygonzales Registered User Join Date: Jan 2006 Location: Smithfield, VA Posts: 1,501	Re: 1997 4.3 is a knocking I understand you can run it. You didn't understand my question. Yeah the rockers are tight that you looked at. But if you "roll" the engine around by hand with valve cover off, you may find the rockers that were down at the time you looked, could now be loose once they are up. You may also find some are not going all the way down when they should because of a collapsed lifter. Merely looking under the valve cover without rotating the engine only gives you a small portion of the puzzle. You have to see the rocker arms in motion. __________________ 99 Z71 (98 body style) Pride and joy



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