Some vehicles may have coolant leaks at the cylinder head around the exhaust manifold (as shown below)
Mazda technical service bulletin 01-013-21-3753 for 2019-2020 Mazda CX-5, 2018-2020 Mazda MAZDA6 and 2016-2020 Mazda CX-9.
- Bulletin number
- 01-013-21-3753
- Component
- Equipment
- Summary
- 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.
Vehicles covered
- Mazda CX-5 2019-2020 20192020
- Mazda MAZDA6 2018-2020 201820192020
- Mazda CX-9 2016-2020 20162017201820192020
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