Mazda Training manual — part 8

Powertrain Engines

Valve Timing

•

For verifying or adjusting the valve timing a timing peg (SST) has to be installed in the
blind plug hole, which is located at the rear of the cylinder block. Then turn the
crankshaft clockwise until the crankshaft counterweight of cylinder no. 1 touches the
timing peg (refer to the workshop manual for details).

NOTE: To prevent damage to the timing peg do not use it to lock the crankshaft in position.

L1001.4_01013

1

Service hole

4

TDC position

2

Crankshaft pulley

5

Crankshaft counterweight of cylinder no.1

3

Detent bolt for crankshaft pulley

6

Timing peg (SST)

Curriculum Training

01-19

Engines Powertrain

•

For verifying or adjusting the valve timing a timing plate (SST) has to be installed in the
camshafts.

NOTE: Never use the timing plate to hold the camshafts while loosening or tightening the

camshaft pulleys. Hold the camshafts using a wrench on the camshaft´s cast
hexagon.

NOTE: From a certain build date on specially coated washers are installed between the

camshaft sprockets and the camshaft to increase the friction. These washers must
be replaced (or installed if not equipped), if the camshaft sprockets have been
removed.

L1001.4_01014

1

Timing plate (SST)

01-20 Curriculum

Training

Powertrain Engines

Accessory Drive Belt

•

A V-ribbed drive belt is fitted to drive the engine accessories.

•

An automatic tensioner provides constant drive belt tension.

L1001.4_01015

1

Generator pulley

5

Water pump pulley

2

Idler pulley

6

A/C compressor pulley

3

Drive belt

7

Crankshaft pulley

4

Power steering pump pulley

8

Drive belt tensioner pulley

•

In order to check the drive belt for wear, verify that the automatic tensioner indicator
mark does not exceed the specification.

L1001.4_01016

1 Indicator

mark

3 Worn

2 Normal

Curriculum Training

01-21

Engines Powertrain

Mechanical (L3-T Engine)

Features

•

The mechanical system of the L3-T engine has the following features:

–

Chain driven 16 valve DOHC engine

–

Balancer shaft unit

–

Valve train with automatic timing chain tensioner and mechanical bucket tappets

–

Variable valve timing system for the intake camshaft

–

V-ribbed belt drive with automatic tensioner

Overview

L1001.4_01017

NOTE: Some of the components of the L3-T engine are very similar in construction and

operation to those of the L3 engine. Therefore, this section only describes the
components which are new or differ from those of the L3 engine.

01-22 Curriculum

Training