Mazda Training manual — part 11

Powertrain Engines

Overview

L1001.4_01026

NOTE: Some of the components of the Z-type engine are very similar in construction and

operation to those of the L-type engines. Therefore, this section only describes the
components which are new or differ from those of the L-type engines.

Curriculum Training

01-31

Engines Powertrain

Cylinder Block

•

The cylinder block is equipped with cylinder liners, the coolant jackets of which are open
towards the top.

•

The cylinder block is composed of an upper and a lower part, in which the main bearing
caps are integrated. Upper and lower cylinder block are matched to each other, i.e. they
cannot be replaced separately. If one of the components exceeds the specification, the
cylinder block must be replaced as a complete unit.

L1001.4_01027

1

Upper cylinder block

2

Lower cylinder block

01-32 Curriculum

Training

Powertrain Engines

Pistons

•

The pistons of the ZJ engine only have valve recesses on the intake side, whereas the
pistons of the Z6 engine have valve recesses on the intake and exhaust side.

•

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

L1001.4_01028

1

Engine front side

4

Z6 engine

2

ZJ engine

5

Valve recesses (exhaust side)

3

Dot indicating the installation direction

6

Valve recesses (intake side)

Curriculum Training

01-33

Engines Powertrain

Crankshaft

•

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

•

The installation procedure for the main bearing shells is the same as on the L-type
engines.

L1001.4_01029

1

Upper main bearing shell

6

Specified measurement

2

Thrust bearing

7

Oil bore

3

Upper main bearing oil groove

8

Crankshaft

4

Main bearing cap

9

Lower main bearing shell

5

Main bearing shell

10

Engine front side

01-34 Curriculum

Training