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Home >> Mazda >> 2020 >> 3 Base, 4D Hatchback, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Mechanical System (VIN L)) >> Timing Chain Removal/Installation >> Engine Front Cover Installation Note
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Engine Front Cover Installation Note

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • For a new engine front cover, the positioning pins in the two locations shown in the figure project to the outside of the engine.
G13174410Courtesy of MAZDA MOTORS CORP.
  1. If the engine front cover is newly replaced, tap the positioning pins in the two locations to the seal surface side.
    G13174411Courtesy of MAZDA MOTORS CORP.
    CAUTION:
    • If a bolt with silicone sealant adhering to it is used, it could result in cracks in the cylinder head and cylinder block.
    G13174412Courtesy of MAZDA MOTORS CORP.
  2. When reusing the engine front cover installation bolts, remove sealant adhering to the bolts.
    CAUTION:
    • If oil, dirt and silicone sealant remains on the silicone sealant application area, the silicone sealant will not seal which will cause oil leakage.
  3. Completely clean and remove oil, dirt, silicone sealant or other foreign matter that may be adhering to the engine front cover, cylinder head, and cylinder block.
    CAUTION:
    • Apply the silicone sealant in a single, unbroken line.
    • To prevent silicone sealant from hardening, adhere the engine front cover and the cylinder block firmly within 10 min. after applying silicone sealant. After adhering them, tighten the installation bolts immediately.
  4. Apply silicone sealant (TB1217D or equivalent) to the engine front cover as shown in the figure.

    SKYACTIV-G 2.0 

    G13174413Courtesy of MAZDA MOTORS CORP.

    SKYACTIV-G 2.5 

    G13174414Courtesy of MAZDA MOTORS CORP.

    Bead thickness 

    1. 2-6 mm {0.1-0.2 in}
    2. 4-6 mm {0.16-0.23 in}
    3. 4-8 mm {0.2-0.3 in}
    CAUTION:
    • Apply the silicone sealant so that it goes into the cylinder head gasket.
  5. Apply silicone sealant (TB1217D or equivalent) to the areas shown in the figure.
    G13174415Courtesy of MAZDA MOTORS CORP.
  6. Install the engine front cover to the engine.
    NOTE:
    • Temporarily install an appropriate bolt to the drive belt auto tensioner installation bolt hole to prevent:
      • A silicone sealant adhesion malfunction in the drive belt auto tensioner installation bolt hole.
      • A bolt mis-installation due to silicone sealant hardening.
    G13174416Courtesy of MAZDA MOTORS CORP.
  7. Prepare an appropriate M8 x 1.25 bolt (length 40 mm {1.6 in}).
    CAUTION:
    • For the number 10 bolt of the tightening order, install the bolts with new washer.
  8. Tighten the engine front cover installation bolts in the order shown in the figure.
    Fig 1: Engine Front Cover Installation Bolts Tightening Sequence
    G13174417Courtesy of MAZDA MOTORS CORP.
  9. Install the wiring harness bracket shown in the figure.
    Fig 2: Wiring Harness Bracket Bolt With Torque Specification
    G13174418Courtesy of MAZDA MOTORS CORP.
  10. Tighten the engine front cover stud bolts.
    Fig 3: Engine Front Cover Stud Bolts With Torque Specification
    G13174419Courtesy of MAZDA MOTORS CORP.
  11. Install the wiring harness bracket shown in the figure.
    Fig 4: Wiring Harness Bracket Bolts With Torque Specification
    G13174420Courtesy of MAZDA MOTORS CORP.
  12. Install the wiring harness clip shown in the figure.
    G13174421Courtesy of MAZDA MOTORS CORP.
  13. Install the insulator shown in the figure.
    Fig 5: Insulator Nut With Torque Specification
    G13174381Courtesy of MAZDA MOTORS CORP.
  14. Connect the A/F sensor connector and clip shown in the figure.
    G13174380Courtesy of MAZDA MOTORS CORP.
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