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Forum: C3 Engines, Driveline and Handling

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Noisy rockers

Posted: 8/29/05 3:42pmMessage 1 of 8
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San Pedro, CA - USA
Joined: 5/26/2005
Posts: 239
Vette(s): 1971, LT-1, T-top, 4-speed (M21), Mulsanne Blue, 3.70 rear, mostly original (sidepipes). 2006, Daytona Sunset Orange Coupe.
I recently had the valve lash adjusted on my '71 LT1 (not by me; I'm not THAT patient), and I still have clicking sounds coming from the number 8 vicinity. The sound does not get quiet upon warming up. Assuming the valve lash was done correctly, what else might I be looking at?
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Noisy rockers

Posted: 8/29/05 6:36pmMessage 2 of 8
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Ear plugs?   

A solid lifter engine is expected to make some noise. If the adjustment is done correctly, tho, you should not have one (rocker arm) making more noise than the others.
1) Not adjusted right
2) Bent/damaged pushrod
3) Worn rocker arm
4) Bad lifter
5) "Flat" cam lobe
6) Weak/damaged valve spring/retainer

Was it adjusted hot, or cold?
Are you sure it's not an exhaust leak in that area?

Is the noise the reason you had them adjusted in the first place, or is it a free "Bonus"?
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Joel Adams
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Noisy rockers

Posted: 8/30/05 3:31pmMessage 3 of 8
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San Pedro, CA - USA
Joined: 5/26/2005
Posts: 239
Vette(s): 1971, LT-1, T-top, 4-speed (M21), Mulsanne Blue, 3.70 rear, mostly original (sidepipes). 2006, Daytona Sunset Orange Coupe.
The valve lash was adjusted hot, and I had it done partially because of the noise on number 8. Obviously, it must be one of those other possible causes. I guess I'll start with the exhaust leak angle (since that's probably the easiest to determine), and work up in difficulty. Thanks for your response.
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Noisy rockers

Posted: 9/2/05 8:53amMessage 4 of 8
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San Pedro, CA - USA
Joined: 5/26/2005
Posts: 239
Vette(s): 1971, LT-1, T-top, 4-speed (M21), Mulsanne Blue, 3.70 rear, mostly original (sidepipes). 2006, Daytona Sunset Orange Coupe.

A follow-up for those who are interested:

It was an exhaust leak. I changed-out the headers, and put in used OEM exhaust manifolds. Since I'm running mufflers in my side-pipes anyway, performance shouldn't change. Also put in plug shields and ran the wires down and up the back of the engine; cleaner, and less likely to be roasted!

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Noisy rockers

Posted: 9/2/05 4:57pmMessage 5 of 8
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Victor, NY - USA
Joined: 7/12/2004
Posts: 6842
Vette(s): 2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe
Nice job. Good to hear everything worked out.
Do you think a stethoscope would have pinpointed the problem sooner?
 
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Noisy rockers

Posted: 9/2/05 6:22pmMessage 6 of 8
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Glad to hear it wasn't a major malfunction!

Joel Adams
C3VR Lifetime Member #56    

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(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Noisy rockers

Posted: 9/6/05 6:15amMessage 7 of 8
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San Pedro, CA - USA
Joined: 5/26/2005
Posts: 239
Vette(s): 1971, LT-1, T-top, 4-speed (M21), Mulsanne Blue, 3.70 rear, mostly original (sidepipes). 2006, Daytona Sunset Orange Coupe.

To answer dwight's question - yes, a stethoscope might have helped, but if I was a doctor, I would have just paid somebody to do the work!! Smile

Seriously though, it would have helped, though I must admit that my diagnostic skills are WAY behind my mechanical skills (such as they are)....................live and learn.

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Noisy rockers

Posted: 9/19/05 7:58pmMessage 8 of 8
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Actually, a stethoscope could help a lot with a mechanical noise, but won't help find a gas (exhaust or vacuum) noise.  The lack of finding a mechanical noise would help  indicate one of these.

A vacuum hose or piece of heater hose used like a stethoscope works very well for this type of noise, but won't do much for the mechanical noise.  If the hose is too small, like a small vacuum hose, it is more difficult.  3/8 hose works very well.

A combination of the two is very usefull.

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