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