Mazda CX-9 Grand Touring. Manual — part 360

OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [MZI-3.7]

1. Disconnect the negative battery cable.

2. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7].)

3. Remove the ventilation hose. (See QUICK RELEASE CONNECTOR (EMISSION SYSTEM)

REMOVAL/INSTALLATION [MZI-3.7] .)

4. Disconnect the vacuum hose. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-

3.7] .)

5. Remove the resonance chamber. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZI-

3.7] .)

6. Remove the dynamic chamber and throttle body as a single unit. (See INTAKE-AIR SYSTEM

REMOVAL/INSTALLATION [MZI-3.7] .)

7. Disconnect the wiring harness.

8. Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [MZI-3.7] .)

9. Remove the dipstick.

10. Remove the cylinder head cover. (See TIMING CHAIN REMOVAL/INSTALLATION [MZI-3.7].)

11. Remove the OCV.

Tightening torque: 8.5-11.5 N.m {87-117 kgf.cm, 76-101 in.lbf}

12. Install in the reverse order of removal.

Fig. 37: Identifying OCV & Bolt
Courtesy of MAZDA MOTORS CORP.

COMPRESSION INSPECTION [MZI-3.7]

NOTE:



The LH side is shown, however, the RH side is the same.

WARNING:



Hot engines and oil can cause severe burns. Turn off the engine and
wait until they are cool.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

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1. Verify that the battery is fully charged.



Recharge it if necessary. (See BATTERY INSPECTION [MZI-3.7] .)

2. Warm up the engine to the normal operating temperature.

3. Perform "Fuel Line Safety Procedure". Leave the fuel pump relay removed. (See BEFORE SERVICE

PRECAUTION [MZI-3.7] .)

4. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7].)

5. Remove the dynamic chamber and throttle body as a single unit. (See INTAKE-AIR SYSTEM

REMOVAL/INSTALLATION [MZI-3.7] .)

6. Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [MZI-3.7] .)

7. Remove the spark plugs.

8. Measure the compression pressure using the following procedure.

1. Connect the compression gauge into the spark plug hole.

2. Crank the engine a minimum of five compression strokes and record the highest reading.

Fig. 38: Measuring Compression Pressure
Courtesy of MAZDA MOTORS CORP.

3. Repeat the test on each cylinder, cranking the engine approximately the same number of

compression strokes.

4. The indicated compression pressures are considered within specification if the lowest reading

cylinder is within 75% of the highest reading. Refer to the COMPRESSION PRESSURE LIMIT
CHART.



Fuel vapor is hazardous. It can very easily ignite, causing serious
injury and damage. Always keep sparks and flames away from fuel.



Fuel line spills and leakage are dangerous. Fuel can ignite and cause
serious injures or death and damage. Fuel can also irritate skin and
eyes. To prevent this, always complete the "Fuel Line Safety
Procedure". (See BEFORE SERVICE PRECAUTION [MZI-3.7] .)

NOTE:



Note the approximate number of compression strokes required
to obtain the highest reading.

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

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Sunday, November 15, 2009 10:01:57 AM

Page 28



If the compression in one or more cylinders is low or the compression difference between
cylinders exceeds the maximum, pour a small amount of clean engine oil into the cylinder
and recheck the compression.



If the compression increases, the piston, the piston rings, or cylinder wall may be worn
and overhaul is required.



If the compression stays low, a valve may be stuck or improperly seated and overhaul
is required.



If two adjacent cylinders indicate low compression pressures, and squirting oil on the
piston does not increase compression, the head gasket may be leaking between
cylinders. Engine oil and/or coolant in the cylinders could result from this condition.

Compression Pressure Limit Chart kPa

COMPRESSION PRESSURE LIMIT CHART

{kgf/cm

, psi}

Maximum

pressure

Minimum

pressure

Maximum

pressure

Minimum

pressure

Maximum

pressure

Minimum

pressure

Maximum

pressure

Minimum

pressure

924 {9.41,

134}

696 {7.10,

101}

1,131

{11.52, 164}

848 {8.65,

123}

1,338

{13.63, 194}

1,000

{10.20,

146}

1,544

{15.73, 224}

1,158

{11.81, 168}

938 {9.56,

136}

703 {7.17,

102}

1,145

{11.67, 166}

855 {8.72,

124}

1,351

{13.77, 196}

1,014

{10.34,

147}

1,558

{15.88,226}

1,165

{11.88, 169}

952 {9.70,

138}

717 {7.31,

104}

1,158

{11.80, 168}

869 {8.86,

126}

1,365

{13.91, 198}

1,020

{10.40,

148}

1,572

{16.02,228}

1,179

{12.02,171}

965 {9.83,

140}

724 {7.38,

106}

1,172

{11.94, 170}

876 {8.93,

127}

1,379

{14.05, 200}

1,034

{10.54,

150}

1,586

{16.16,230}

1,186

{12.09, 172}

979 {9.97,

142}

738 {7.53,

107}

1,186

{12.08, 172}

889 {9.07,

129}

1,303

{13.28,202}

1,041

{10.62,

151}

1,600

{16.30,232}

1,200

{12.24, 174}

933 {9.51,

144}

745 {7.60,

109}

1,200

{12.23,174}

903 {9.21,

131}

1,407

{14.34, 204}

1,055

{10.76,

153}

1,055

{10.75,153}

1,207

{12.31,175}

1,007

{10.26,

146}

758 {7.73,

110}

1,214

{12.37, 176}

910

{9.28,132}

1,420

{14.47,206}

1,062

{10.83,

154}

1,627

{16.58, 154}

1,220

{12.44, 177}

1,020

{10.39,

148}

765 {7.80,

111}

1,227

{12.50,178}

917

{9.35,133}

1,434

{14.61,208}

1,075

{10.96,

156}

1,641

{16.72,238}

1,227

{12.51, 178}

1,034

{10.54,

150}

779 {7.94,

113}

1,241

{12.65, 180}

931 {9.49,

135}

1,448

{14.76,210}

1,083

{10.04,

157}

1,655

{16.87,240}

1,241

{12.65, 180}

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

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Sunday, November 15, 2009 10:01:57 AM

Page 29

9. Remove the compression gauge.

10. Install the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [MZI-3.7] .)

11. Install the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [MZI-3.7] .)

12. Install the dynamic chamber and throttle body as a single unit. (See INTAKE-AIR SYSTEM

REMOVAL/INSTALLATION [MZI-3.7] .)

13. Install the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7].)

14. Install the fuel pump relay.

15. Complete the "AFTER REPAIR PROCEDURE". (See AFTER SERVICE PRECAUTION [MZI-

3.7] .)

TIMING CHAIN REMOVAL/INSTALLATION [MZI-3.7]

1,048

{10.68,

152}

786 {8.02,

114}

1,255

{12.79, 182}

936 {9.54,

136}

1,462

{14.90,212}

1,089

{11.10,

158}

1,669

{17.01,242}

1,248

{12.73, 181}

1,062

{10.82,

154}

793 {8.09,

115}

1,269

{12.93, 184}

952

{9.70,138}

1,476

{15.04,214}

1,103

{11.25,

160}

1,682

{17.14,244}

1,262

{12.87, 183}

1,076

{10.96,

156}

807 {8.23,

117,}

1,282

{13.06,186}

965 {9.84,

140}

1,489

{15.17,216}

1,117

{11.39,

162}

1,696

{17.28,246}

1,269

{12.94, 184}

1,089

{11.10,

158}

814 {8.30,

118}

1,296

{13.21,188}

972 {9.91,

141}

1,503

{15.32,218}

1,124

{11.46,

163}

1,710

{17.43,248}

1,202

{12.26, 186}

1,103

{11.24,

160}

827 {8.43,

120}

1,310

{13.35, 190}

979 {9.98,

142}

1,517

{15.46,220}

1,138

{11.60,

165}

1,724

{17.57,250}

1,289

{13.14, 187}

1,110

{11.31,

161}

834 {8.50,

121}

1,324

{13.49, 192}

993 {10.2,

144}

1,631

{16.62,222}

1,145

{11.67,

166}

WARNING:



Fuel vapor is hazardous. It can very easily ignite, causing serious
injury and damage. Always keep sparks and flames away from fuel.



Continuous exposure to USED engine oil has caused skin cancer in
laboratory mice. Protect your skin by washing with soap and water
immediately after working with engine oil.

NOTE:



The following procedure "TIMING CHAIN REMOVAL/INSTALLATION" is

2008 Mazda CX-9 Grand Touring

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:01:57 AM

Page 30

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