Mazda 6. Manual — part 104
COMPRESSION PRESSURE
B–9
B
COMPRESSION INSPECTION
A6E221402000W01
Warning
• Hot engines and oil can cause severe burns. Be careful not to burn yourself during removal/
installation of each component.
1. Verify that the battery is fully charged.
• Recharge it if necessary. (See
2. Warm up the engine to the normal operating temperature.
3. Stop the engine and allow it to cool off for about 10 min.
4. Perform “Fuel Line Safety Procedures”. Leave the fuel pump relay removed. (See
Warning
• 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 injuries or death and
damage. Fuel can also irritate skin and eyes. To prevent this, always complete the “Fuel Line
Safety Procedure”. (See
F–17 Fuel Line Safety Procedure
5. Remove the ignition coil connector.
6. Remove the spark plugs. (See
7. Connect a compression gauge into the spark plug
hole.
8. Fully depress the accelerator pedal and crank the
engine.
9. Note the maximum gauge reading.
10. Inspect each cylinder as above.
• If the measured value is less than the limited
value, or there is a cylinder whose
compression value varies from that of other
cylinders by 196.1 kPa {1.999 kgf/cm
2
, 28.44
psi} or more, add a small amount of engine oil
through the spark plug hole. Then measure
the compression pressure and perform the
respective operations for the following cases.
— 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 the compression in adjacent cylinders stays low, the cylinder head gasket may be damaged or the
cylinder head distorted and overhaul is required.
Compression
kPa {kgf/cm
2
, psi} [rpm]
kPa {kgf/cm
2
, psi} [rpm]
COMPRESSION PRESSURE
Item
Engine type
L8
Standard
1,750 {17.845, 253.816} [300]
Minimum
1,225 {12.492, 177.64} [300]
Maximum difference
between cylinders
196.1 {1.999, 28.44}
Item
Engine type
LF
Standard
1,720 {17.5391, 249.465} [300]
Minimum
1,204 {12.277, 174.58} [300]
Maximum difference
between cylinders
196.1 {1.999, 28.44}
AME2214W001
B–10
COMPRESSION PRESSURE, TIMING CHAIN
kPa {kgf/cm
2
, psi} [rpm]
11. Disconnect the compression gauge.
12. Install the spark plugs. (See
G–10 SPARK PLUG REMOVAL/INSTALLATION
.)
13. Connect the ignition coil connector.
14. Install the fuel pump relay. (See
End Of Sie
TIMING CHAIN REMOVAL/INSTALLATION
A6E221512201W01
Warning
• 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
F–17 Fuel Line Safety Procedure
1. Disconnect the negative battery cable.
2. Remove the spark plugs. (See
G–10 SPARK PLUG REMOVAL/INSTALLATION
3. Remove the tire (RH).
4. Remove the under cover.
5. Loosen the water pump pulley bolt and removal the drive belt. (See
6. Remove the CKP sensor. (See
F–54 CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION
7. Drain the engine oil. (See
.)
8. Remove the P/S oil pump with the oil hose still connected and position the P/S oil pump so that it is out of the
way. (See
N–22 POWER STEERING OIL PUMP REMOVAL/INSTALLATION
.)
9. Remove the front drive shaft (RH) from the joint shaft. (See
M–12 JOINT SHAFT REMOVAL/INSTALLATION
10. Remove in the order indicated in the table.
11. Install in the reverse order of removal.
12. Start the engine and:
• Inspect for the engine oil, engine coolant, transaxle oil and fuel leakage.
• Verify the ignition timing, idle speed and idle mixture. (See
F–8 IGNITION TIMING INSPECTION
13. Perform a road test.
Item
Engine type
L3
Standard
1,430 {14.5819, 207.404} [290]
Minimum
1,000 {10.197, 145.00} [290]
Maximum difference
between cylinders
196.1 {1.999, 28.44}
TIMING CHAIN
TIMING CHAIN
B–11
B
.
AME2215W001
1
B–17 Cylinder Head Cover Installation Note
2
Crankshaft pulley lock bolt
(See
B–12 Crankshaft Pulley Lock Bolt Removal
B–16 Crankshaft Pulley Lock Bolt Installation
3
Crankshaft pulley
4
Water pump pulley
5
Drive belt idler pulley
6
No.3 engine mount rubber and No.3 engine joint
bracket
(See
B–12 No.3 Engine Mount Rubber and No.3
Engine Joint Bracket Removal Note
B–16 No.3 Engine Mount Rubber and No.3
Engine Joint Bracket Installation Note
)
7
B–14 Engine Front Cover Installation Note
8
Front oil seal
(See
B–13 Engine Front Cover Removal Note
(See
B–15 Front Oil Seal Installation Note
)
9
Chain tensioner
(See
B–12 Chain Tensioner Removal Note
10
Tensioner arm
11
Chain guide
12
Timing chain
(See
B–14 Timing Chain Installation Note
)
13
Seal
14
Oil pump chain tensioner
15
Oil pump chain guide
16
Oil pump sprocket
(See
B–13 Oil Pump Sprocket Removal Note
(See
B–13 Oil Pump Sprocket Installation Note
)
17
Oil pump chain
18
Camshaft sprocket
B–12
TIMING CHAIN
Crankshaft Pulley Lock Bolt Removal Note
1. Remove the cylinder block lower blind plug.
2. Install the SST.
3. Turn the crankshaft clockwise the crankshaft is in
the No.1 cylinder TDC position.
4. Hold the crankshaft pully by using the SSTs.
Chain Tensioner Removal Note
1. Using a thin screwdriver, hold the chain tensioner ratchet lock mechanism away from the ratchet stem.
2. Slowly compress the tensioner piston.
3. Hold the tensioner piston using a 1.5 mm {0.059
in} wire or paper clip.
No.3 Engine Mount Rubber and No.3 Engine Joint Bracket Removal Note
1. Suspend the engine using the SSTs.
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