Tapping sound??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMCjunkie · 04-13-2014, 03:15 PM

On the passenger side, I hear a tapping sound, the faster I go, the faster the tapping sound. I took off the valve cover, as far as I can tell, no bent rods, no cracked valves. What else should I look for while I have it apart? Could it be an exhaust manifold leak?

Open for suggestions.

Thanks yall!!
junk

**Ironangel** · 04-13-2014, 04:23 PM

Check the converter to flexplate bolts...Also may be an exhaust leak.

NoNeck · 04-13-2014, 06:24 PM

If you rule out an exhaust leak maybe try this. With the engine OFF, wiggle the rocker arms to check for excessive clearances. If you find an obvious loose one, it could be as simple as tightening the rocker arm nut maybe 1/8th turn. Start the engine and see if the tapping is quieter. It could be as simple as adjusting the rocker clearance(s).

A not so simple fix would be if you have a collapsed lifter on a cylinder, or a wiped cam lobe.

Try wiggling the rockers first. Good luck!

POP

hamjet · 04-13-2014, 06:28 PM

you say "the faster I go" does that mean it only does it while moving or does it still do it when stopped with the hood up...

04-13-2014, 03:15 PM	#1
GMCjunkie Dude...I'm a CHICK Join Date: Jul 2000 Location: Lakeland Georgia Posts: 6,192	Tapping sound??? On the passenger side, I hear a tapping sound, the faster I go, the faster the tapping sound. I took off the valve cover, as far as I can tell, no bent rods, no cracked valves. What else should I look for while I have it apart? Could it be an exhaust manifold leak? Open for suggestions. Thanks yall!! junk Attached Images __________________ ~~~~~~~~~~~~~* "The unexamined life is not worth living" -Socrates ~~~~~~~~~~~~~* '71 GMC Suburban 4x4

04-13-2014, 04:23 PM	#2
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Tapping sound??? Check the converter to flexplate bolts...Also may be an exhaust leak. __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

04-13-2014, 06:24 PM	#3
NoNeck Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 1,106	Re: Tapping sound??? If you rule out an exhaust leak maybe try this. With the engine OFF, wiggle the rocker arms to check for excessive clearances. If you find an obvious loose one, it could be as simple as tightening the rocker arm nut maybe 1/8th turn. Start the engine and see if the tapping is quieter. It could be as simple as adjusting the rocker clearance(s). A not so simple fix would be if you have a collapsed lifter on a cylinder, or a wiped cam lobe. Try wiggling the rockers first. Good luck! POP __________________ 2016 RAM Laramie HEMI 1966 Fairlane GT/A, 390/335 HP If it costs you a dollar to make a friend, KEEP THE DOLLAR. If it costs you a friend to make a dollar, KEEP THE FRIEND.

04-13-2014, 06:28 PM	#4
hamjet Registered User Join Date: Apr 2013 Location: South Westerlo, New York Posts: 1,325	Re: Tapping sound??? you say "the faster I go" does that mean it only does it while moving or does it still do it when stopped with the hood up... __________________ Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.