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#1 |
Join Date: Nov 2014
Location: NH
Posts: 13
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Hi all,
I'm a new owner of a stock '95 car with 26K miles. I took delivery in early January, and I've tried to start and run the car every few weeks to circulate fluids, etc. The last time I started it, I noticed a loud tick from under the passenger's side cam cover, toward the front of the engine. It's definitely a mechanical sound, i.e. not a noisy injector or exhaust leak. It seems to match cam timing, as the noise occurs about 5 times/sec at idle. Oil pressure has always been fine. There are no alarming sounds from any other part of the engine. I changed the oil and filter and have let the engine run until it's warm, but the noise persists. For what it's worth, the car is in an unheated garage, and we have had some very cold nights here in New England. Here's some cell phone video of the problem - pardon the rotated video, but the audio is the main point: https://drive.google.com/file/d/0B83...ew?usp=sharing (Note that you can still hear it when the camera is on the LH side of the engine, but that's only because the noise is loud enough to always be audible in the background.) Any ideas on how I should approach this? I'm preparing myself for the possibility that I'll need to remove the cams on that side to replace the lifters. Is there anything else that I should try before this? Assuming that I do need to replace lifters, can this be done with the engine in the car? --Colin Last edited by cmb; 02-28-2015 at 07:01 PM. |
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#2 |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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Does it tick more quickly when you rev the engine? Seems like sort of a silly question but if it's something external, maybe the tick speed and engine speed would be unrelated? Figured it couldn't hurt to ask since you didn't mention it.
Last edited by KILLSHOTS; 02-28-2015 at 07:27 PM. |
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#3 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,380
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Dual mass flywheel? Or lack there of? Where in NH are you?
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#4 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Check for exhaust leaks....I have a ticking lifter, but not that loud. Does it idle smooth? Dual Mass Flywheel? belt tensioner?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#5 |
![]() Join Date: Apr 2007
Location: Northern VA
Posts: 2,655
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Video sounds nasty.
You might try slacking the belt tensioner with the engine running to see if it makes any difference.
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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#6 |
Join Date: Nov 2014
Location: NH
Posts: 13
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Yes, the tick follows the engine speed. It will increase in rate if I bring the revs up past idle. The idle is smooth. Engine never stumbles, and doesn't sound like it's missing.
A couple of you have asked about the flywheel. How might this contribute to the noise? I don't have any particular reason to believe that it's ever been replaced -- does that mean it's the dual-mass part? It's difficult to tell from the video, but the sound certainly seems to come from under the cam cover (at cyl #2) rather than from something external at the front of the engine. I'll check out the belt tensioner. Is the thought that the tensioner itself might be bad, or that the belt tension is causing some other problem? I'm in Merrimack, NH. |
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#7 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Throw some Marvel Mystery oil into oil. Let it run through. See if lifter quiets down.
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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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#8 |
![]() Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,170
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Lifter or maybe a bad valve spring?
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Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold |
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#9 | |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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#10 |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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Also, that is not the belt tensioner. Mine was bad and I had Marc rebuild it. It does not tick like that...mine made a high-pitched whining/squealing sound.
Last edited by KILLSHOTS; 02-28-2015 at 09:40 PM. |
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