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