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- Plano, Texas, USA
Not like the cracked cylinder head on the 2.5L NA with CD, the cracked cylinder head on the 2.5T could be caused by different reasons (deformation of the exhaust manifold and residual stress in the cylinder head) at different area, and usually it takes time and higher mileage to expose the symptom. The 2.5T came out in 2016 on the CX-9, not until 5 years later we started to see the reports concerning the problem. The TSB was issued on 10/15/2021, any redesigned head may take even longer time to develop the crack.Has there been any reports of 21's or 22's with the problem? I'm getting ready to unload our 19 GTR and will probably buy another CX-5 unless this problem is still out there.
DESCRIPTION
Some vehicles may have coolant leaks at the cylinder head around the exhaust manifold (as shown below). There may be cracks at the stud bolt hole (1) or at the outside of the exhaust manifold (2).
Cracks may be caused by:
• Deformation of the exhaust manifold during usage causing unexpected force to certain areas of the cylinder head.
• Residual stress generated during production in the cylinder head material may be greater than expected. The
external force from the exhaust system when driving over bumps may cause unexpected force to certain areas of the cylinder head.
To eliminate this concern, the design of the exhaust manifold gasket and the cylinder head has been modified to reduce the force on the cylinder head.
Honestly since Mazda has issued a TSB on cracked cylinder head for the 2.5T, but we haven’t seen one for the 2.5L NA with CD, I believe the severity has to be more on the 2.5T than the 2.5L NA with CD.