Mazda Training manual - part 19

 

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Mazda Training manual - part 19

 

 

Powertrain Engines 

Cylinder Block 

• 

The cylinder block is a conventional construction with separate main bearing caps. 

 

L1001.4_01061 

 

Pistons 

• 

The piston shape meets the requirements of the common rail direct injection system, i.e. 
the combustion chamber is integrated in the piston head.  

• 

The piston skirt is coated to reduce friction between the piston and the cylinder.  

 

L1001.4_01062 

 

Anti-friction coating 

F-mark (engine front) 

2 Combustion 

chamber 

  

 

Curriculum Training 

01-63 

Engines Powertrain 

Crankshaft 

• 

The crankshaft is equipped with a key for the installation of the crankshaft timing pulley 
and the crankshaft pulley. 

• 

In addition, the crankshaft features a drive gear for the oil pump. 

 

L1001.4_01063 

 

Oil pump drive gear 

Lower thrust bearing 

Upper main bearing shells 

Lower main bearing shell 

Upper thrust bearing 

Main bearing cap 

 

01-64 Curriculum 

Training 

Powertrain Engines 

Cylinder Head 

• 

The cylinder head is a conventional construction with separate camshaft bearing caps. 

• 

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 if their length exceeds the specification 

(refer to the workshop manual for details). 

 
• 

The leak-off lines for the fuel injectors are integrated in the cylinder head. 

 

NOTE:  Always replace the gaskets of the injector leak-off lines when removing them. As the 

leak-off lines are located under the cylinder head cover, fuel leaking from the lines 
can contaminate the engine oil. This results in oil dilution and hence in engine 
damage.  

 

L1001.4_01064 

 

Exhaust side 

Engine front side 

2 Intake 

side 

  

 

Curriculum Training 

01-65 

Engines Powertrain 

Camshaft 

• 

The camshaft is equipped with a key for the installation of the camshaft pulley. 

• 

The camshaft drives the vacuum pump directly, and the power steering oil pump via a 
helical gear. 

 

Valve Actuation 

• 

The camshaft actuates the valves via roller rocker arms and rocker bridges. 

• 

The valve clearance has to be measured between roller rocker arm and rocker bridge, 
and is adjusted through the adjustment screws of roller rocker arm and rocker bridge 
(refer to the workshop manual for details). 

 

NOTE:  In order to prevent damage to the rocker bridge an adjustment wrench set (SST) is 

required to hold the rocker bridge while loosening or tightening the locknut. 

 
• 

The valve clearance has to be checked (and adjusted if necessary) for the first time after 
20,000 km or 12 months (whichever occurs first). After that it has to be checked (and if 
necessary adjusted) every 120,000 km or 6 years (whichever occurs first). 

• 

For checking and adjusting of the valve clearances refer to the workshop manual. 

 

L1001.4_01065 

 

SST (for loosening / tightening the 
locknut) 

7 Rocker 

bridge 

SST (for adjusting) 

Camshaft 

SST (for holding the rocker bridge) 

Rocker arm shaft 

Adjusting screw (rocker bridge) 

10 

Roller rocker arm 

Measuring point for valve clearance 

11 

Locknut (rocker arm) 

Locknut (rocker bridge) 

12 

Adjusting screw (rocker arm) 

 

01-66 Curriculum 

Training 

 

 

 

 

 

 

 

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