Engine Front Cover Assembly Note Mazda 3 BM

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.

Locating Positioning Pins On Engine Front Cover. Scheme 289

Scheme 290

Scheme 291

Scheme 292

Scheme 293

Scheme 294

Scheme 295

1. If the engine front cover is newly replaced, tap the positioning pins in the two locations to the seal surface side.
2. Completely clean and remove any oil, dirt, sealant or other foreign material that may be adhering to the engine front cover, cylinder head, and cylinder block.
3. 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. Using bolts with the old seal adhering could cause cracks in the cylinder head and cylinder block. (Scheme 290): Tapping Positioning Pin On Seal Surface Side Using Tool (Scheme 291): Identifying Cylinder Block Damages (Old Seal Adhering Bolt)
4. Apply silicone sealant to the engine front cover as shown in the figure. (Scheme 292): Identifying Silicone Sealant Applying Areas On Engine Front Cover Bead thickness 2-6 mm {0.1-0.2 in} 4-6 mm {0.16-0.23 in} 4-8 mm {0.2-0.3 in}
5. Apply silicone sealant to the areas shown in the figure. CAUTION: Apply the silicone sealant so that it goes into the cylinder head gasket.
6. Install the engine front cover to the engine. NOTE: Temporarily install an appropriate bolt to the drive belt auto tensioner Bolt hole to prevent: A silicone sealant adhesion malfunction in the drive belt auto tensioner Bolt hole. A bolt mis-installation due to silicone sealant hardening. (Scheme 293): Identifying Silicone Sealant Applying Areas On Cylinder Head Gasket
7. Prepare an appropriate M8 1.25 bolt (length 40 mm {1.6 in}). (Scheme 294): Identifying Drive Belt Auto Tensioner Bolt Hole
8. Tighten the engine front cover Bolts in the order shown in the figure. Tightening torque 20-26 N.m {2.1-2.6 kgf.cm, 15-19 in.lbf}
9. Remove the bolt installed to the drive belt auto tensioner Bolt hole when installing the drive belt auto tensioner. (Scheme 295): Identifying Engine Front Cover Bolt Tightening Sequence

Scheme 296

Scheme 297

Scheme 298

1. Completely clean and remove any oil, dirt, sealant or other foreign material that may be adhering to the cylinder block and oil pan.
2. When reusing the oil pan Bolts, clean any old sealant from the bolts. CAUTION: Apply the silicon sealant in a single, unbroken line around the whole perimeter. To prevent silicone sealant from hardening, adhere the oil pan to the cylinder block within 10 min. after silicone sealant is applied. Tighten the Bolts completely soon after adhering. Using bolts with the old seal adhering could cause cracks in the cylinder block, etc. (Scheme 296): Identifying Possible Cylinder Block Damage Caused By Old Sealant Adhering To Bolt
3. Apply silicone sealant to the oil pan along the inside of the bolt holes as shown in the figure. (Scheme 297): Applying Silicone Sealant To Oil Pan Thickness 2.0-6.0 mm {0.08-0.23 in}
4. Install the oil pan to the cylinder block.
5. Tighten the bolts in the order shown in the figure. Tightening torque 8-11 N.m {82-112 kgf.cm, 71-97 in.lbf} (Scheme 298): Identifying Oil Pan Mounting Bolt Tightening Sequence

Scheme 299

Scheme 300

Scheme 301

1. Install a new O-ring to the O-ring installation groove of the engine front cover. CAUTION: To prevent damage to the electric variable valve timing motor/driver, do not apply e cessive force (force of 100 N {10.2 kgf, 22.5 lbf} or more) to the shaded areas shown in the figure. (Scheme 299): Identifying Electric Variable Valve Timing Motor/Driver Force Applying Areas
2. Install the electric variable valve timing motor/driver using the following procedures. NOTE: The eccentric shaft on the electric variable valve timing actuator side can be rotated to the left and right. The electric variable valve timing motor/driver can be assembled with the joint groove of the eccentric shaft in any position, and it will not lead to vehicle damage or performance reduction. (Scheme 300): Rotating Electric Variable Valve Timing Actuator Side Eccentric Shaft Before installation, rotate the joint of the end of the electric variable valve timing motor so that it is aligned to the joint groove on the electric variable valve timing actuator side. Engage the joint on the end of the electric variable valve timing motor with the joint groove on the electric variable valve timing actuator side. Attach the seal surface. Tighten the electric variable valve timing motor/driver Bolts. Tightening torque 20-26 N.m {2.1-2.6 kgf.m, 15-19 ft.lbf} (Scheme 301): Identifying Electric Variable Valve Timing Motor Joint And Electric Variable Valve Timing Actuator Side Joint Groove

Scheme 302

1. Apply clean engine oil to the inner surface of a new front oil seal.
2. Insert the front oil seal into the engine front cover by hand.
3. Tap the oil seal in evenly using the SST and a hammer. (Scheme 302): Tapping Oil Seal

Front oil seal press-in amount 0-0.5 mm {0-0.019 in}

Identifying Front Oil Seal Press-In Dimension. Scheme 303