Engine Front Cover Installation 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: Locating Positioning Pins Of Engine Front Cover

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.

Fig 2: Tapping Positioning Pins With Hammer
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- If a bolt with sealant adhering to it is used, it could result in cracks in the cylinder head and cylinder block.
Fig 3: Inserting Bolt With Sealant Into Cylinder Block
Courtesy of MAZDA MOTORS CORP.
When reusing an engine front cover installation bolts, remove sealant adhering to the bolts.
CAUTION:
- If oil, dirt and sealant remains on the sealant application area, the silicone sealant will not seal which will cause oil leakage.
Completely clean and remove oil, dirt, sealant or other foreign matter that may be adhering to the engine front cover, cylinder head, and cylinder block.
CAUTION:
- Apply the silicon 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.
Apply silicone sealant to the engine front cover as shown in the figure.

Fig 4: Sealant Application Area Of 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.

Fig 5: Locating Silicone Sealant Application Area Of Cylinder Head
Courtesy of MAZDA MOTORS CORP.
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 6: Locating Drive Belt Auto Tensioner Installation Bolt Hole
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.
Tighten the engine front cover installation bolts in the order shown in the figure.

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

Tightening torque

20-26 N.m {2.1-2.6 kgf.m, 15-19 ft.lbf}
Remove the bolt installed to the drive belt auto tensioner installation bolt hole when installing the drive belt auto tensioner.
Install the ground cable and wiring harness bracket shown in the figure.

Fig 8: Installing Ground Cable And Wiring Harness Bracket

Courtesy of MAZDA MOTORS CORP.