Mazda Engine SKYACTIV-G 2.5. Manual — part 5

MECHANICAL

01-10–4

OIL CONTROL VALVE (OCV) INSPECTION

id011000801400

Coil Resistance Inspection

1. Measure the resistance between terminals A and

B using an ohmmeter.

OCV coil resistance

6.9—7.5 ohms [20°C {68°F}]

• If it is not within the specification, replace the

OCV.

Spool Valve Operation Inspection

1. Verify that the spool valve in the OCV is in the

maximum valve timing advance position as

indicated in the figure.

• If there is any malfunction, replace the OCV.

Note

• When applying battery positive voltage

between the OCV terminals, the connection

can be either of the following:

—

Positive battery cable to terminal A,

negative battery cable to terminal B

—

Positive battery cable to terminal B,

negative battery cable to terminal A

2. Apply battery positive voltage between the OCV

terminals and verify that the spool valve operates

and moves to the maximum valve timing retard

position.

• If there is any malfunction, replace the OCV.

3. Stop applying battery positive voltage and verify

that the spool valve returns to the maximum valve

timing advance position.

• If there is any malfunction, replace the OCV.

End Of Sie

WM: HYDRAULIC LASH ADJUSTER (HLA)

A

B

OIL CONTROL VALVE (OCV)

bpe5ue00000015

SPOOL VALVE
(MAXIMUM VALVE TIMING
ADVANCE POSITION)

bpe1ze00000100

A

B

OIL CONTROL VALVE (OCV)

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VALVE TIMING
ADVANCE

VALVE TIMING
RETARD

SPOOL VALVE
(MAXIMUM VALVE TIMING
RETARD POSITION)

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MECHANICAL

01-10–5

01-10

HYDRAULIC LASH ADJUSTER (HLA) INSPECTION

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1. Visually inspect the HLA surface where it contacts

the rocker arm for wear or damage.

• If there is any malfunction, replace the HLA.

End Of Sie

WM: ROCKER ARM

ROCKER ARM INSPECTION

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1. Rotate the roller or the rocker arm by hand and

verify that rotates smoothly.

• If it does not rotate smoothly, replace the

rocker arm.

2. Visually inspect the rocker arm surface where it

contacts the HLA and valve stem for wear or

damage.

• If there is any malfunction, replace the rocker

arm.

End Of Sie

EN: ENGINE COMPLETE

ENGINE OVERHAUL SERVICE WARNING

id011000503900

Warning

• Continuous exposure to USED engine oil has been shown to cause skin cancer in laboratory mice.

Protect your skin by washing with soap and water immediately after performing work.

End Of Sie

ROCKER ARM
CONTACT SURFACE

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ROLLER

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MECHANICAL

01-10–6

ENGINE MOUNTING/DISMOUNTING

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Mounting

1. Install the

SST (arms) to the three positions as shown in the figure and temporarily tighten the bolts (Part No.

9YA20-1003 or M10 × 1.5 length 90 mm {3.55 in}).

2. Install the

SSTs (bolts and nuts) to the three

positions of the

SST (plate) as shown in the

figure.

3. Install the

SST (bolts, nuts and plate) set in Step 2

to the

SST (arms) set in Step 1 using the SSTs

(hook and nuts).

4. Adjust the bolts so that

approx. 20 mm {0.79 in}

of thread is exposed from the side of the plate.

5. Adjust the bolts and nuts so that the plate and

arms are parallel.

6. Tighten the

SSTs (bolts and nuts) to affix the SST

firmly.

7. Install the engine to the

SST (engine stand).

8. Remove the oil drain plug and drain the engine

oil.

9. Replace the gasket with a new one and install the

oil pan drain plug.

Tightening torque

30—41 N·m {3.1—4.1 kgf·m, 23—30 ft·lbf}

Dismounting

1. Dismount in the reverse order of mounting.

End Of Sie

SST INSTALLED

SST INSTALLATION HOLE

ENGINE FRONT

49 L010 102

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49 L010 101

49 L010 104

49 L010 105

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PARALLEL

ENGINE

APPROX. 20 mm {0.79 in}

49 L010 102

49 L010 104

49 L010 104

49 L010 103

49 L010 101

49 L010 105

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MECHANICAL

01-10–7

01-10

TIMING CHAIN DISASSEMBLY

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Caution

• If the camshaft is rotated with the timing chain removed and the piston at the top dead center

position, the valve may contact the piston and the engine could be damaged. When rotating the

camshaft with the timing chain removed, rotate it after lowering the piston from the top dead

center position.

• When rotating the camshaft using a

wrench on the cast hexagon, the wrench

may contact the rocker arm and damage

the rocker arm. To prevent damage to the

rocker arm when holding the camshaft on

the cast hexagon, use a wrench on the

rear side of the engine as shown in the

figure to secure a clearance between the

cam.

Note

• Width at the cast hexagon of the camshaft is

22—24 mm {0.87—0.94 in}.

CAMSHAFT

WRENCH

CAST HEXAGON

ROCKER ARM

CONTACT

ENGINE REAR

DOES NOT CONTACT

SECURE CLEARANCE

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22

—

24 mm

{0.87

—

0.94 in}

CAMSHAFT

CAST HEXAGON

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