Engine Tick Update
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
Engine Tick Update
2025 Z06/Z07 Coupe. Engine tick seemed excessive. Took car to the local dealer and they told me that it would cost me $450 to do the sound measurement, since the TSB did not cover 2025 builds. Asked the service writer to just listen to the engine and give me his opinion. When he heard how loud the ticking was, he called out a technician to listen and both agreed that it seemed excessive. Informed me that GM would need to authorize the sound measurement to be made under warranty and that the process could take as long as a month. I was leaving for a trip so I left the car. Upon returning, was informed that GM rep approved the TSB to be performed under warranty. I now await the results of the sound measurement.
Drifting
Joined: Feb 2023
Posts: 1,357
Likes: 1,120
2025 Z06/Z07 Coupe. Engine tick seemed excessive. Took car to the local dealer and they told me that it would cost me $450 to do the sound measurement, since the TSB did not cover 2025 builds. Asked the service writer to just listen to the engine and give me his opinion. When he heard how loud the ticking was, he called out a technician to listen and both agreed that it seemed excessive. Informed me that GM would need to authorize the sound measurement to be made under warranty and that the process could take as long as a month. I was leaving for a trip so I left the car. Upon returning, was informed that GM rep approved the TSB to be performed under warranty. I now await the results of the sound measurement.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 1,190
Likes: 68
From: Woodland Hills California
I am the original owner. Car has 580 miles. The ticking noise was always there. Gets louder as oil temp increases. The TSB only cover the 2023 model year. GM approved the TSB for my 2025. Just got update that the dealer has ordered cam caps but they are on back order. Replacing the cam caps is not part of the TSB. Only a retorquing of the caps is included in the TSB.
I have a major concern about replacing the cam caps. What I know about other DOHC heads, the manufacturing of the valve train includes placing the cam caps on the cylinder head and then line boring the assembly to get concentricity for the camshaft to fit with the proper alignment and clearances. You cannot just replace a cam cap with a new one with assurance that alignment is maintained. I need to find out more about why and how the repair is being performed. On DOHC engines I have worked on, the cam caps are numbered and must be returned to their original location and orientation to avoid problems.
I have a major concern about replacing the cam caps. What I know about other DOHC heads, the manufacturing of the valve train includes placing the cam caps on the cylinder head and then line boring the assembly to get concentricity for the camshaft to fit with the proper alignment and clearances. You cannot just replace a cam cap with a new one with assurance that alignment is maintained. I need to find out more about why and how the repair is being performed. On DOHC engines I have worked on, the cam caps are numbered and must be returned to their original location and orientation to avoid problems.
Drifting
Joined: Feb 2023
Posts: 1,357
Likes: 1,120
I am the original owner. Car has 580 miles. The ticking noise was always there. Gets louder as oil temp increases. The TSB only cover the 2023 model year. GM approved the TSB for my 2025. Just got update that the dealer has ordered cam caps but they are on back order. Replacing the cam caps is not part of the TSB. Only a retorquing of the caps is included in the TSB.
I have a major concern about replacing the cam caps. What I know about other DOHC heads, the manufacturing of the valve train includes placing the cam caps on the cylinder head and then line boring the assembly to get concentricity for the camshaft to fit with the proper alignment and clearances. You cannot just replace a cam cap with a new one with assurance that alignment is maintained. I need to find out more about why and how the repair is being performed. On DOHC engines I have worked on, the cam caps are numbered and must be returned to their original location and orientation to avoid problems.
I have a major concern about replacing the cam caps. What I know about other DOHC heads, the manufacturing of the valve train includes placing the cam caps on the cylinder head and then line boring the assembly to get concentricity for the camshaft to fit with the proper alignment and clearances. You cannot just replace a cam cap with a new one with assurance that alignment is maintained. I need to find out more about why and how the repair is being performed. On DOHC engines I have worked on, the cam caps are numbered and must be returned to their original location and orientation to avoid problems.
