Cylinder Head Installation Note

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

Measure the length of the cylinder head bolt.
- If it exceeds the maximum specification, replace the cylinder head bolt.
Courtesy of MAZDA MOTORS CORP.

Standard cylinder head bolt length

145.2-145.8 mm {5.717-5.740 in}

Maximum cylinder head bolt length

146.5 mm {5.767 in}
When a cylinder head bolt is reused, apply engine oil to any part of the following:
- Bolt seating surface
- Cylinder head seating surface
CAUTION:
- Completely remove oil, dirt, and silicone sealant adhering to the cylinder head gasket contacting surfaces. Otherwise, a sealing malfunction may occur.
Completely remove any oil, dirt, and silicone sealant adhering to the cylinder block.
CAUTION:
- Be aware of the following points, otherwise a sealing malfunction may occur due to hardening of the silicone sealant.
  - Set cylinder head on cylinder block within 10 min after silicone sealant is applied
  - After setting cylinder head, tighten cylinder head bolts immediately
Apply silicone sealant (TB1217D or equivalent) to the areas shown in the illustration.

Courtesy of MAZDA MOTORS CORP.

Silicone sealant application diameter

5-10 mm {0.2-0.3 in}
Install a new cylinder head gasket to the cylinder block.
Apply silicone sealant (TB1217D or equivalent) to the areas shown in the illustration.

Courtesy of MAZDA MOTORS CORP.

Silicone sealant application diameter

5-10 mm {0.2-0.3 in}
Set the cylinder head on the cylinder block.
Tighten the cylinder head bolts in the order shown in the following 4 steps.

Fig 1: Cylinder Head Bolts Tightening Sequence
Courtesy of MAZDA MOTORS CORP.
Install the chain for the SST which was set aside and secure the engine.
Remove the engine lifter or garage jack.
Remove the temporarily assembled oil pan.