[Z06] Lifter/Valve Spring Noise
Thread Starter
Pro
Joined: Apr 2013
Posts: 575
Likes: 56
From: Placitas, New Mexico
Lifter/Valve Spring Noise
Hi folks. I have a 2003 MY Z06 with 69K miles. I recently had the valve springs replaced due to the well-known probability of spring failure. My mechanic said that all was well, but that the engine is now "noisier" than before. I can hear apparent lifter/valve noise that wasn't there before the replacement job. The new springs are a bit stronger than stock but not by much - they are dual springs.
Is extra lifter/spring noise common? Or do I need more adjustments? Thanks much!
Is extra lifter/spring noise common? Or do I need more adjustments? Thanks much!
Thread Starter
Pro
Joined: Apr 2013
Posts: 575
Likes: 56
From: Placitas, New Mexico
[QUOTE=Paul 75 L82;1587701702]There is no adjustment. The rockers torque down when on the base circle of the cam. This is detailed in the service manual and it needs to be followed.
Thanks for the info. So no adjustments.....but what about the additional noise? Is that normal?
Thanks for the info. So no adjustments.....but what about the additional noise? Is that normal?
Le Mans Master
Joined: Dec 2000
Posts: 5,245
Likes: 25
From: Blue Ridge Georgia
If your mechanic didn't follow the proper procedure he could have torqued the rockers when they were not on the base circle of the cam. That could make for more noise. Just changing the springs shouldn't change the sound. Print out the page I posted and go see him and see what he has to say.
Supporting Vendor
Joined: Sep 2013
Posts: 3,095
Likes: 1,262
From: Harbor City California
Dual springs make for more noise. When pressures increase (open/seat) the audible noise level increase's.
Yes normal.
Also the rockers do not need to be on base circle to be properly torqued. If they are not on base circle when torquing then there is the possibility of the tech/mech messing it up if they are not aware of what to do/look for. When torquing the rockers when they are on base circle there is zero chance of messing it up even if the tech/mech was not paying attention. Service manual calls for them to be on base circle so there is no possibility of torquing them down incorrectly.
Yes normal.
Also the rockers do not need to be on base circle to be properly torqued. If they are not on base circle when torquing then there is the possibility of the tech/mech messing it up if they are not aware of what to do/look for. When torquing the rockers when they are on base circle there is zero chance of messing it up even if the tech/mech was not paying attention. Service manual calls for them to be on base circle so there is no possibility of torquing them down incorrectly.
Last edited by American Heritage; Aug 30, 2014 at 02:57 PM.
Thread Starter
Pro
Joined: Apr 2013
Posts: 575
Likes: 56
From: Placitas, New Mexico
Dual springs make for more noise. When pressures increase (open/seat) the audible noise level increase's.
Yes normal.
Also the rockers do not need to be on base circle to be properly torqued. If they are not on base circle when torquing then there is the possibility of the tech/mech messing it up if they are not aware of what to do/look for. When torquing the rockers when they are on base circle there is zero chance of messing it up even if the tech/mech was not paying attention. Service manual calls for them to be on base circle so there is no possibility of torquing them down incorrectly.
Yes normal.
Also the rockers do not need to be on base circle to be properly torqued. If they are not on base circle when torquing then there is the possibility of the tech/mech messing it up if they are not aware of what to do/look for. When torquing the rockers when they are on base circle there is zero chance of messing it up even if the tech/mech was not paying attention. Service manual calls for them to be on base circle so there is no possibility of torquing them down incorrectly.
Melting Slicks
Joined: Jul 2010
Posts: 3,355
Likes: 113
From: Los Angeles
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Thread Starter
Pro
Joined: Apr 2013
Posts: 575
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From: Placitas, New Mexico
I bought them on line at "WS6.Com." I was looking for Patriot springs and had initially ordered them from this place. They called me and told me that Patriot is now out of business, but that they had a set/kit that matched Patriot's specifications. I wish I had kept the box that they came in; I don't remember the brand name of the kit. The springs certainly looked good! I think I remember that the springs were good for .660 lift????
Pro
Joined: May 2009
Posts: 576
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From: St Louis Missouri
Does it sound like a sewing machine? (My grandmother/mother always had a sewing machine growing up, so its a very distinct sound to me). My valve train sounds just like a sewing machine. It's normal with the Dual Springs. Post a video of your car idling, it would help some.