Busted Valve Spring?
Thread Starter
Safety Car
Joined: Nov 1999
Posts: 4,285
Likes: 83
From: S.E. WI.
St. Jude Donor '08-'09-'10
Busted Valve Spring?
Sold my Z06 To a friend. Three days later, he comes over and it is ticking. I figure pushrod/maybe a rocker arm. Pull the covers and all looks good and no miss.
Spring are standard AFR 205 dual springs. If it is a broken inner spring, would it give off a ticking sound? Car is not missing and seems to drive OK. makes me think an inner spring may have failed.
May even be a lifter. I looked at the outer springs and saw nothing out of the ordinary and pushrods and rockers are fine..
Appreciate any feedback from those who have busted dual springs or have experience with same.
Spring are standard AFR 205 dual springs. If it is a broken inner spring, would it give off a ticking sound? Car is not missing and seems to drive OK. makes me think an inner spring may have failed.
May even be a lifter. I looked at the outer springs and saw nothing out of the ordinary and pushrods and rockers are fine..
Appreciate any feedback from those who have busted dual springs or have experience with same.
Last edited by Chalky; Jul 5, 2008 at 02:22 PM.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Do you know what happened over the three days in between? If he missed a shift that would create problems. I would check:
1. Rockers for missing bearings
2. Bent pushrods
3. Broken valve spring
1. Rockers for missing bearings
2. Bent pushrods
3. Broken valve spring
Thread Starter
Safety Car
Joined: Nov 1999
Posts: 4,285
Likes: 83
From: S.E. WI.
St. Jude Donor '08-'09-'10
Already pulled rocker and pushrod. All is well. It is either an inner spring or a possible bad roller lifter.
Just wondering what kind of noise a broken inner spring would give off if any.
Just wondering what kind of noise a broken inner spring would give off if any.
Pro
Joined: Apr 2006
Posts: 647
Likes: 22
From: Norwalk CT and Boynton Beach FL
I've broken inner valve springs before, and the car will not run well and misfire --- valve doesn't close fast enough with one of the two springs broken. Determine which side the noise is coming from and pull that valve cover off and start her up. Put a rubber hose to you ear and move the hose around with the car running to determine where the ticking is coming from. Also listen around timing chain area as well. Good luck and let us know when you've solve the problem
Thread Starter
Safety Car
Joined: Nov 1999
Posts: 4,285
Likes: 83
From: S.E. WI.
St. Jude Donor '08-'09-'10
Good info. I wasn't sure how car would behave with an inner spring broken.
Car is not missing or running rough, just a clicking. Almost has to be a collapsed lifter.
Car is not missing or running rough, just a clicking. Almost has to be a collapsed lifter.
Drifting
Joined: Feb 2007
Posts: 1,993
Likes: 7
From: LaPine Oregon
Is the car an '02 Z06?
If the car is an '02 Z06 then a broken valve spring is typical , which is why the the big resale price difference between the '02- mid year '03 and the '04. Just better to avoid those cars and get an '04 or a '01 .
Last edited by dieseldave56; Jul 6, 2008 at 03:57 AM. Reason: just a jab at the '01 naysayers
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Team Owner
Joined: Mar 1999
Posts: 22,025
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From: At the beach in little Rhody
Race Director
Joined: Oct 2002
Posts: 16,477
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Dave, was at a party and missed your call yesterday.
I don't have any extra pushrods (other than my stock ones).
I sold you the 7.425s I had.
As a reminder, I have a like new set of PRC duals in my stock heads...if you find you need a set of springs, you can borrow those. I have a spring compressor, but not the air fitting needed to thread into the plug holes.
I don't have any extra pushrods (other than my stock ones).
I sold you the 7.425s I had.
As a reminder, I have a like new set of PRC duals in my stock heads...if you find you need a set of springs, you can borrow those. I have a spring compressor, but not the air fitting needed to thread into the plug holes.
Thread Starter
Safety Car
Joined: Nov 1999
Posts: 4,285
Likes: 83
From: S.E. WI.
St. Jude Donor '08-'09-'10
Tom:
After I called, I remembered buying the ++ pushrods.
Appreciate the offer on the springs. I am thinking now that it is a lifter issue. When we had the valve covers off, I gave the springs a quick look at didn't see any busted springs.
After putting rockers and pushrods back in place, we started it up and ticking was quieter for about a minute. Regardless, I don't want to pull the head if it is a lifter.
After I called, I remembered buying the ++ pushrods.
Appreciate the offer on the springs. I am thinking now that it is a lifter issue. When we had the valve covers off, I gave the springs a quick look at didn't see any busted springs.
After putting rockers and pushrods back in place, we started it up and ticking was quieter for about a minute. Regardless, I don't want to pull the head if it is a lifter.
Thread Starter
Safety Car
Joined: Nov 1999
Posts: 4,285
Likes: 83
From: S.E. WI.
St. Jude Donor '08-'09-'10
Pro
Joined: Apr 2006
Posts: 647
Likes: 22
From: Norwalk CT and Boynton Beach FL
I've broken inner valve springs before, and the car will not run well and misfire --- valve doesn't close fast enough with one of the two springs broken. Determine which side the noise is coming from and pull that valve cover off and start her up. Put a rubber hose to you ear and move the hose around with the car running to determine where the ticking is coming from. Also listen around timing chain area as well. Good luck and let us know when you've solve the problem
