Mazda Training manual — part 14

Powertrain Engines

Valve Train

•

The camshafts are driven by a timing belt, which has to be replaced every 160,000 km or
10 years (whichever occurs first). In addition, the valve clearance must be inspected
(and if necessary adjusted) at the same service interval.

•

The procedure for verifying or adjusting the valve timing is the same as on the L-type
engines.

NOTE: In order to prevent damage to the plastic camshaft pulleys when loosening or

tightening the lock bolts, use the pulley holder (SST) with a suitable piece of hose
installed to the SST studs.

L1001.4_01043

1

Timing belt

3

Timing belt tensioner

2

Camshaft pulleys

4

Crankshaft pulley

Curriculum Training

01-43

Engines Powertrain

Timing Belt Tensioner

•

Depending on the build date of the vehicle different manual or automatic timing belt
tensioners are fitted (refer to the workshop manual for details).

NOTE: On vehicles with automatic tensioner do not remove the locking pin (SST), until the

timing belt is correctly positioned. Failure to follow this instruction may result in
personal injury, or damage to the timing belt tensioner.

L1001.4_01044

Manual timing belt tensioner with eccentric cam

L1001.4_01045

Manual timing belt tensioner with slotted bracket

01-44 Curriculum

Training

Powertrain Engines

L1001.4_01046

Automatic timing belt tensioner (vehicles built from 09/2003 onwards)

1

Locking pin (SST)

L1001.4_01047

Automatic timing belt tensioner (vehicles built from 04/2005 onwards)

1

Locking pin (SST)

Curriculum Training

01-45

Engines Powertrain

Accessory Drive Belts

•

A V-ribbed drive belt is fitted to drive the engine accessories. There are two variants of
the accessory belt drive:

–

Vehicles without A/C have one drive belt

–

Vehicles with A/C have two drive belts

•

Both variants have elastic drive belts (also termed as stretchy belt), i.e. they do not need
a tensioner. Since retensioning is not possible, the drive belt must not be re-used.

L1001.4_01050

A

Vehicles without A/C

3

Power steering oil pump pulley

B

Vehicles with A/C

4

Crankshaft pulley

1

Generator pulley

5

A/C compressor pulley

2 Water

pump

pulley

01-46 Curriculum

Training