Mazda Training manual - part 30

Powertrain Engines 

Camshafts 

• 

The camshafts are mounted hanging in the upper part of the cylinder head. 

• 

The intake camshaft drives the exhaust camshaft by a timing chain. 

• 

The intake camshaft is equipped with a key for the installation of the camshaft pulley. 

• 

The exhaust camshaft drives the vacuum pump directly. 

 

L1001.4_01104 

 

1 

Timing chain tensioner 

5 

Intake camshaft 

2 

Camshaft bearing cap 

6 

Timing chain 

3 

Exhaust camshaft 

7 

Oil supply bores 

4 

Upper cylinder head 

 

 

 

Curriculum Training 

01-107 

Engines Powertrain 

• 

An automatic timing chain tensioner is fitted to ensure optimum chain tension over the 
service life of the engine. 

• 

The timing chain tensioner operates using engine oil pressure. 

 

NOTE:  The timing chain tensioner must be inserted together with the timing chain and the 

camshafts into the cylinder head upper part, as it is impossible to fit it afterwards.

 

 

L1001.4_01108 

 

1 Chain 

guides 

  

 

• 

For verifying or adjusting the valve timing the timing marks on the crankshaft sprockets 
have to be aligned with the gold-colored plates on the timing chain links.

 

 

L1001.4_01107 

 

1 Timing 

mark 

2 Gold-colored 

plate 

 
 

01-108 Curriculum 

Training 

Powertrain Engines 

Valve Train 

• 

The valve train is similar to that of the Y4 engine except for the additional chain drive of 
the exhaust camshaft. For this reason, the procedure for verifying or adjusting the valve 
timing is the same as on the Y4 engine. 

 

L1001.4_01110 

 

1 

Hole for camshaft timing peg (SST) 

8 

Hole for crankshaft timing peg (SST) 

2 

Intake camshaft sprocket  

9 

Water pump pulley 

3 

Timing chain 

10 

Tensioner pulley 

4 

Exhaust camshaft sprocket 

11 

Fuel high-pressure pump pulley 

5 

Idler pulley 

12 

Hole for alignment of the fuel high-
pressure pump pulley 

6 

Timing belt 

13 

Intake camshaft pulley 

7 Crankshaft 

pulley 

  

 

Curriculum Training 

01-109 

Engines Powertrain 

Lubrication 

Features 

• 

The lubrication system of the Y-type engines has the following features: 

– 

Trochoid gear type oil pump, directly driven by the crankshaft 

– 

Water-cooled type oil cooler 

– 

Cartridge type oil filter 

– 

Oil jet valves 

 

Parts Location 

 

L1001.4_01099 

 

1 

Oil pump 

6 

Oil pressure switch 

2 Gasket 

7 Washer 

3 

Oil jet valve 

8 

Oil pan 

4 

O-ring 

9 

Oil pan drain plug 

5 

Oil filter with oil cooler 

10 

Oil strainer 

 
 

01-110 Curriculum 

Training