Mazda Training manual - part 9

Powertrain Engines 

Pistons  

• 

The shape of the pistons has been adapted to the requirements of the direct injection 
system, i.e. the piston top is recessed to improve the mixture formation. 

• 

The piston skirt is redesigned due to the modified oil jet valves. In addition, it features a 
coating to reduce friction between the piston and the cylinder.  

• 

Piston, piston pin and connecting rod are not shrinkage fitted, i.e. the components can 
be replaced separately. 

 

L1001.4_01018 

 

1 

Oil jet release width 

 

 

 

Cylinder Head 

• 

Due to the adoption of the direct injection system the cylinder head is equipped with 
installation holes for the fuel injectors. 

 

L1001.4_01019 

 

1 

Fuel injector installation hole 

2 

Combustion chamber 

 

 

Curriculum Training 

01-23 

Engines Powertrain 

Camshafts  

• 

The intake camshaft features a trochoid shaped cam, which drives the high-pressure 
pump of the direct injection system.  

 

L1001.4_01020 

 

1 

Exhaust camshaft 

5 

Cam heel 

2 

Thrust collar 

6 

High-pressure pump drive cam 

3 

Cam nose 

7 

Pulse wheel for CMP sensor 

4 

Cam journal 

8 

Intake camshaft 

 
 

01-24 Curriculum 

Training 

Powertrain Engines 

Valve Train 

• 

The valve train is equipped with a roller chain and respective sprockets to improve 
durability.  

 

L1001.4_01021 

 

1 

Camshaft sprockets 

5 

Chain guide 

2 

Timing chain 

6 

Crankshaft sprocket 

3 

Pitch size 

7 

Chain tensioner 

4 

Pin 

8 

Chain tensioner arm 

 

Timing Chain Tensioner  

• 

The L3-T engine features a modified automatic timing chain tensioner. However, the 
operating principle is the same as on the L3 engine.  

 

L1001.4_01022 

 

1 Housing 

4 Rack 

2 Ratchet 

spring 

5 Plunger 

3 Ratchet 

6 Plunger 

spring 

 
 

Curriculum Training 

01-25 

Engines Powertrain 

Valve Timing 

• 

Due to the modified intake camshaft a different timing plate (SST) is required to verify or 
adjust the valve timing. 

 

L1001.4_01023 

 

1 

Timing plate (SST) 

 

 

 

01-26 Curriculum 

Training