Mazda Training manual - part 28

Powertrain Engines 

• 

There is no positioning tab for locating the lower bearings in the main journals. For 
installing the lower main bearing shells a guide (SST) and two guide studs (SST) are 
required (refer to the workshop manual for details). 

 

L1001.4_01146 

 

1 

Guide (SST) 

2 

Guide studs (SST) 

 
 
 

Curriculum Training 

01-99 

Engines Powertrain 

Cylinder Head 

• 

The cylinder head features a bolted on camshaft housing, which comprises an upper and 
a lower part. Upper and lower camshaft housing as well as the cylinder head are 
matched to each other, i.e. they cannot be replaced separately. If one of the components 
exceeds the specification, the cylinder head must be replaced as a complete unit. 

• 

There are no guide sleeves for locating the camshaft housing on the cylinder head. For 
this reason, two guide studs (SST) are required for the installation of the camshaft 
housing (refer to the workshop manual for details). 

• 

The cylinder head gasket is available in five different thicknesses depending on the 
piston protrusion. The gasket is marked respectively (refer to the workshop manual for 
details). 

• 

The cylinder head bolts are torque-to-yield bolts, which must be tightened in several 
stages (refer to the workshop manual for details). 

 

NOTE:  The cylinder head bolts must not be re-used. 

 

L1001.4_01092 

 

1 

Engine front side 

4 

Lower camshaft housing  

2 

Upper camshaft housing  

5 

Cylinder head 

3 Camshaft 

  

 

01-100 Curriculum 

Training 

Powertrain Engines 

Valve Actuation 

• 

The camshaft actuates the valves via roller cam followers.  

• 

The adjustment of the valve clearance is performed via maintenance-free hydraulic 
tappets. 

 

L1001.4_01093 

 

1 

Camshaft 

3 

Roller cam follower 

2 Hydraulic 

tappet 

  

 

Curriculum Training 

01-101 

Engines Powertrain 

Valve Train 

• 

The camshaft is driven by a timing belt, which has to be replaced every 240,000 km or 
10 years (whichever occurs first). 

 

NOTE:  The timing belt must not be re-used. 

 

NOTE:  The timing belt has to be installed with the arrows pointing in the direction of engine 

rotation. 

 

L1001.4_01094 

 

1 

Camshaft pulley 

6 

Hole for crankshaft timing peg (SST) 

2 

Hole for camshaft timing peg (SST) 

7 

Water pump pulley 

3 

Idler pulley 

8 

Tensioner pulley 

4 

Timing belt 

9 

Fuel high-pressure pump pulley 

5 

Crankshaft pulley 

10 

Hole for alignment of the fuel high-
pressure pump pulley 

01-102 Curriculum 

Training