Installing Front Rotor Housing

As front and rear rotor housings are not interchangeable, be sure they are installed in correct sequence. Apply sealing agent to front side of rotor housing as shown in Fig 1.

Fig 1: Applying Sealing Agent to Rotor Assembly
Courtesy of MAZDA MOTORS CORP.
To provide greater durability to sealing rubbers, install a protector behind each inner sealing rubber. See Fig 2. Install a new "O" ring, sealing rubbers and protector in front side of engine housing. Apply light coat of petroleum jelly to hold seals in place.

Fig 2: Installing Protectors for Inner Sealing Rubbers
Courtesy of MAZDA MOTORS CORP.

Apply light coat of petroleum jelly to hold seals in place.

NOTE: Inner sealing rubber is square type. The wider white line of sealing rubber should face toward combustion chamber and seam of rubber should be placed as shown in Fig 3. Do not stretch sealing rubbers.
Invert front rotor housing using care that seals remain in position, and install on front housing. Lubricate tubular dowels and insert through front rotor housing holes.

Fig 3: Positioning Inner Sealing Rubber
Courtesy of MAZDA MOTORS CORP.

Wider white line of sealing rubber should face toward combustion chamber.
Insert apex seal springs so that both ends of spring may support the back side of the apex seal. Install the soft seal into corner seal. Install corner seal springs and seals into their respective grooves. Fit side pieces to original positions and lubricate with engine oil.
Confirm that spring is set correctly on side piece. See Fig 4. Confirm smooth movement of each seal by pressing on head.
Apply sealing agent on the rear side of front housing in areas shown in Fig 1 and then place new "O" ring, sealing rubbers and protector on rear side of front housing. Apply engine oil to sliding surfaces of front rotor housing.

Fig 4: Positioning of Apex Seal and Spring
Courtesy of MAZDA MOTORS CORP.

Check side piece for correct installation