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04-13-2015
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#1 |
 
Join Date: Jun 2011
Location: Hereford, Arizona
Posts: 45
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Me too!!...Top end clatter / lifter tick?
Top end clatter / lifter tick? <--- referenced posting is here.
I am having the exact same problem with my 13k miles '95 (stock) as described in the thread above. It sounds exactly the same as the video posted in that thread. (Ticking noise from vicinity of valve train over cylinder #2). The only difference is... mine is not going away on its own. I have tried: ** Added MMO to oil ... ran... changed oil. ** Run engine with accessory belt removed. (noise stayed same). ** Took to the "best" LT5 mechanic locally... baffled him. (Not surprisingly...'nuff said.) I am trying next: ** putting in 0-20W synthetic with a little MMO added... will run for about 15 minutes low RPM... then put in new 5-30W oil (using AMSOIL, presently.) (The thought behind this being "unsticking"/"pumping up" lifter.) After that...I don't know what to do next except yank engine and change lifters. Any advice?? Thanks! Bill
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 Bill '72 Coupe '95 ZR-1 (#318) '03 50th Ann'y Convertible HISTORICAL FILES: '86 Coupe (4+3) -- SOLD 2013 |
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04-13-2015
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#2 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,707
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Re: Me too!!...Top end clatter / lifter tick?
Try throwing some MMO into the fuel tank. Could it be injector? Is the idle smooth or rough?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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04-13-2015
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#3 |
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Join Date: Jun 2011
Location: Hereford, Arizona
Posts: 45
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Re: Me too!!...Top end clatter / lifter tick?
Idle is smooth... power is good. I will throw some MMO into gas, anyhow... but 99% sure it's not an injector. Thanks!!
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Bill '72 Coupe '95 ZR-1 (#318) '03 50th Ann'y Convertible HISTORICAL FILES: '86 Coupe (4+3) -- SOLD 2013 |
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04-13-2015
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#4 |
 
Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Re: Me too!!...Top end clatter / lifter tick?
Bill,
When you put MMO in the crankcase , leave it in there for a couple of hundred miles . 300-400 miles should do it. That way your giving the MMO a chance to work. Just a word about MMO. When using it in the car don't do much red lining.
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
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04-13-2015
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#5 |
 
Join Date: Apr 2007
Location: Northern VA
Posts: 2,661
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Re: Me too!!...Top end clatter / lifter tick?
Bill,
Some history, has the noise just started or has it been doing it for some time?
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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04-13-2015
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#6 | |
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Join Date: Jun 2011
Location: Hereford, Arizona
Posts: 45
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Re: Me too!!...Top end clatter / lifter tick?
Quote:
Noise started following a long drive. Prior to the long drive, I changed the oil and put in a Haibeck chip. (the Haibeck chip is the only non-stock thing in car.) Since the noise started, I've changed the oil again, and changed the filter (this was following adding some MMO and running that a bit.) Bought car with 10,xxx miles and noise started at about 13,xxx.
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Bill '72 Coupe '95 ZR-1 (#318) '03 50th Ann'y Convertible HISTORICAL FILES: '86 Coupe (4+3) -- SOLD 2013 |
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11-11-2017
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#7 |
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Join Date: Apr 2007
Location: Northern VA
Posts: 2,661
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Re: Me too!!...Top end clatter / lifter tick?
I’ve heard of some cases where top end clatter was traced to a jammed chain tensioner.
Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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