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Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical (VIN A) (2 Of 6)) >> Cylinder Head Removal/Installation [PYUL] >> Remove the engine front cover >> Engine Front Cover Installation Note

Engine Front Cover Installation Note

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • The new engine front cover has two positioning pins that project outward from the engine as shown in the figure below.
G16699652Courtesy of MAZDA MOTORS CORP.
SYMBOL AND CONTENT DESCRIPTION

Symbol Content
1 POSITIONING PIN
2 Outside of engine
3 Sealing surface side
  1. When replacing the engine front cover with a new one, insert two positioning pins into the seal surface side.
    G16699653Courtesy of MAZDA MOTORS CORP.
    SYMBOL AND CONTENT DESCRIPTION

    Symbol Content
    1 Outside of engine
    2 Sealing surface side
    3 POSITIONING PIN
    4 Wood chip
    0-1 mm {0.00-0.03 in}
    CAUTION:
    • The cylinder head and cylinder block may be cracked if a bolt with a fixed sealant is used.
    G16699654Courtesy of MAZDA MOTORS CORP.
    SYMBOL AND CONTENT DESCRIPTION

    Symbol Content
    1 Adhering sealant
    2 Breakage
  2. When the engine front cover mounting bolt is reused, cleanly remove the sealant attached to the bolt.
    CAUTION:
    • If oil, dirt, and sealant remain on the silicone sealant application surface and the step bead, the silicone sealant will not seal which will cause oil leakage.
    G16699655Courtesy of MAZDA MOTORS CORP.
    SYMBOL AND CONTENT DESCRIPTION

    Symbol Content
    1 STEP BEAD
    2 SILICONE SEALANT APPLICATION SURFACE
    3 Engine front cover
  3. Cleanly remove oil, dust, sealant, etc. attached to the engine front cover, cylinder head and cylinder block.
  4. Degrease the silicone sealant application surface and the step bead.
    NOTE:
    • The liquid gasket shall be applied without any gap.
    • In order to prevent hardening of the liquid gasket, the engine front cover should be brought into close contact with the cylinder block and cylinder head within 10 minutes after application of the liquid gasket. After sealing, complete the installation bolt tightening immediately.
    • Do not apply silicone sealant to the step bead.
  5. Apply silicone sealant (TB1217D) to the engine front cover according to the directions shown in the figure below.
    G16700027Courtesy of MAZDA MOTORS CORP.
    SYMBOL AND CONTENT DESCRIPTION

    Symbol Content
    1 Bead thickness 2-6 mm {0.1-0.2 in}
    2 Bead thickness 4-6 mm {0.16-0.23 in}
    3 Bead thickness 4-8 mm {0.2-0.3 in}
    10 mm {0.39 in}
    32.5 mm {1.28 in}
    0.5-1.5 mm {0.02-0.05 in}
    90°
    CAUTION:
    • Apply so as to fill the cylinder head gasket.
  6. Apply silicone sealant (TB1217D) to the areas shown in the figure below.
    G16699657Courtesy of MAZDA MOTORS CORP.
  7. Attach the engine front cover to the engine.
    NOTE:
    • In order to prevent the adhesion failure of the liquid gasket in the hole of the drive belt auto tensioner mounting bolt and to prevent the bolt from being unable to be mounted after the liquid gasket has hardened, install an appropriate bolt once in the hole of the drive belt auto tensioner mounting bolt.
    G16699658Courtesy of MAZDA MOTORS CORP.
    SYMBOL AND CONTENT DESCRIPTION

    Symbol Content
    1 Drive belt auto tensioner mounting bolt holes
  8. Prepare a suitable bolt of M8-1.25, 40 mm underneck length.
  9. Tighten the No. 1 engine front Cover installation bolts in the order shown in the figure below.
    Fig 1: No. 1 Engine Front Cover Installation Bolts Tightening Sequence
    G16700030Courtesy of MAZDA MOTORS CORP.
    TIGHTENING TORQUE SPECIFICATIONS

    Symbol Content
    (1) (2)... Servicing procedure
    23 N.m {2.35 kgf.m, 16.95 ft.lb}
    CAUTION:
    • For the number 1 and 8 bolts of the tightening order, install the bolts with washers.
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