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Free Member
Send PMPlacentia, CA - USA
Joined: 2/16/2004
Posts: 78
Vette(s): 1978 vette with an 80-82 stlye rear end molded in. BW six speed & an L82... for now. Lowered with VBP springs and bilsteins. Polished torq thrust wheels. New paint, audio system, aluminum radiator... Flowmaster and extreme flow exhaust components.
Drove my '78 today and heard a rhythmic tapping from the engine. I'm freakin' out! What could it be? Improper valve lash? Something crank or rod related!?!? I pulled of the valve covers and everything looks ok, pushrods did not seem to be bent. The noise seems to be louder from underneath the car but that could just be because the ground is reflecting the noise. Give me best and worst case scenarios. Also if anyone has a good link describing how to adjust valve lash that would be great. I don't know much about engine internals so go easy on me. AHHHHH! HELP! -Adam 
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Lifetime Member
Send PMKingston, PA - USA
Joined: 11/26/2003
Posts: 636
Vette(s): 1977 L-82 originally white/buckskin interior.
Currently undergoing a frame-off resto. and modifications.YEEHAW!!!
C can
H hear
E every
V valve
R rap
O on
L long
E extended
T trips
H hear
E every
V valve
R rap
O on
L long
E extended
T trips
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Lifetime Member
Send PMHot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
run a search here..
a month or so ago Ken and I detailed a few different methods
a month or so ago Ken and I detailed a few different methods
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v
Free Member
Send PMPlacentia, CA - USA
Joined: 2/16/2004
Posts: 78
Vette(s): 1978 vette with an 80-82 stlye rear end molded in. BW six speed & an L82... for now. Lowered with VBP springs and bilsteins. Polished torq thrust wheels. New paint, audio system, aluminum radiator... Flowmaster and extreme flow exhaust components.
Cracked
Head
Every
Valve
Rattles
Oil
Leaks
Exhaust
Too
Head
Every
Valve
Rattles
Oil
Leaks
Exhaust
Too
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k
If the noise is louder in the front and seem to be on the bottem check the pully on the crankshaft...it could be cracked and cause a valve type noise. It happened to me and when I put my hand down there I could feel the cracks. Drove me nuts as I adjusted the valves and checked everything else. How I determined it was the pully..when the engine was cold no noise..hot it made noise. The water pump put a drag on the pully and caused it to bend.
Good luck
Alan
Good luck
Alan
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S
Hi Adam
If it sounds louder on the bottom maybe it is just an exhaust leak?
Steve
If it sounds louder on the bottom maybe it is just an exhaust leak?
Steve
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Use a screw driver or wood dowel as a stethoscope and see if you can pinpoint the location better.
Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box
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L
I had a cam gear bolts come loose and was rubbing the timing cover.
Dave
Dave
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in Forum: C3 Engines, Driveline and Handling
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