Replacing the valve stem seals (Mazda Familia BG)

All engines

High oil consumption can be caused by worn out oil seals. Oil seals on B3, B5, B6 (SOHC), BP (SOHC) engines can be replaced without removing the cylinder head, in any case, a special tool MAZDA SST 49B0210A0 is required, as well as a nozzle for compressed air (HAZET 3428). On other engines, or if there is no special tool, it is necessary to remove the cylinder head.

Removal

B6 (DOHC), BP (DOHC) and Diesel Engines

1. Remove the camshaft and bucket tappets, see Section Removal and installation camshafts.

2. Remove the cylinder head, see Section Removal and installation the cylinder head/replacing the cylinder head gasket.

3. Remove the valves, see Section Removal and installation valves.

Engines B3, B5, B6 (SOHC), BP (SOHC)

1. Remove the rocker shaft, see Section Camshaft/camshaft drive.

2. Unscrew all spark plugs.

3. Set the piston of the corresponding cylinder to the bottom dead center (BDC). To do this, first set the crankshaft to the position corresponding to the TDC of the piston of the 1st cylinder, see Section Removal and installation of the timing belt of engines B3, B5, B6 (SOHC), BP (SOHC).

4. If the piston of the 1st cylinder is at TDC, pistons of the 2nd and 3rd cylinders are at BDC. Mark the belt pulley from below with chalk, then turn the crankshaft 1/2 turn (180°) so that the chalk mark is at the top. Now piston of the 1st cylinder is at BDC.

5. Screw the HAZET 3428 compressed air nozzle into the spark plug thread of the corresponding cylinder.

6. If there is no special device, you should make a nozzle for compressed air from an old spark plug. To do this, saw off the ground electrode "1". Break off the ceramic insulator "2" with a screwdriver and break off the middle electrode "3". Knock out the remains of the central electrode together with element "4" and connecting pin "5" with a suitable punch (approx. 3 mm). In this case, clamp the spark plug in a vice or insert it into a socket head.

Caution! The spark plug thread must not be damaged to avoid subsequent damage to the spark plug thread.

Caution! The spark plug thread must not be damaged to avoid subsequent damage to the spark plug…

7. Screw the prepared spark plug into the appropriate cylinder and connect it with a hose to the compressed air compressor.

8. Maintain a constant pressure of 6 Bar in the cylinder.

8. Maintain a constant pressure of 6 Bar in the cylinder.

9. Screw the MAZDA 49B0120A0 device to support brackets 1 and 5 and compress the valve springs using the device.

Attention! The piston must be at BDC.

10. Remove the valve crackers, loosen the valve springs.

Attention! Loosen tightly seated crackers by lightly hitting the pry bar with a hammer.

11. Remove the valve cups and springs.

12. Remove the oil deflector caps. A special device is used for removal in workshops (MAZDA SST49S120170, HAZET 791-5 or HAZET 791-2). The old valve stem seals are very tightly seated. If possible, use an impact driver to remove them.

Installation

1. Push the oil deflector cap onto the valve guide by hand.

2. Using the special tool MAZDA SST49L012001 and SST49L012002, press the oil deflector cap by hand until the tool touches the cylinder head. If there is no special tool, you can use a suitable tube of the same diameter and blunt edges.

3. Insert and compress the spring cups and valve springs.

4. Insert valve crackers, loosen springs.

5. Replace all valve stem seals in the same manner. Install the tappets and camshaft, see Sections Camshaft/camshaft drive, Removal and installation camshafts.