Engine Front Cover Assembly Note

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.

Fig 1: Identifying Engine Front Cover And Positioning Pins

Courtesy of MAZDA MOTORS CORP.

If the engine front cover is newly replaced, tap the positioning pins in the two locations to the seal surface side.
Completely clean and remove any oil, dirt, sealant or other foreign matter that may be adhering to the engine front cover, cylinder head, and cylinder block.
When reusing the engine front cover Bolts, clean any old sealant from the bolts.
CAUTION:
- Apply the silicon sealant in a single, unbroken line.
- To prevent silicone sealant from hardening, adhere the engine front cover to the cylinder block within 10 min. after silicone sealant is applied. Tighten the Bolts completely soon after adhering.
  
  Fig 2: Tapping Positioning Pins To Seal Surface Side
  Courtesy of MAZDA MOTORS CORP.
- Using bolts with the old seal adhering could cause cracks in the cylinder head and cylinder block.
Fig 3: Cleaning Old Sealant From Bolts
Courtesy of MAZDA MOTORS CORP.
Apply silicone sealant to the engine front cover as shown in the figure.

Fig 4: Identifying Silicone Sealant Applying Area To Engine Front Cover
Courtesy 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}
Apply silicone sealant to the areas shown in the figure.
CAUTION:
- Apply the silicone sealant so that it goes into the cylinder head gasket.
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.
Fig 5: Identifying Silicone Sealant Applying Area Into Cylinder Head Gasket
Courtesy of MAZDA MOTORS CORP.
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.
Fig 6: Identifying Drive Belt Auto Tensioner Bolt Hole
Courtesy of MAZDA MOTORS CORP.
Tighten the engine front cover Bolts in the order shown in the figure.

Fig 7: Engine Front Cover Bolt Tightening Sequence
Courtesy of MAZDA MOTORS CORP.

Tightening torque

20-26 N.m {2.1-2.6 kgf.cm, 15-19 in.lbf}
Remove the bolt installed to the drive belt auto tensioner installation bolt hole when installing the drive belt auto tensioner.