Mazda MX-6 1998, Workshop Manual

Page: 426 / 1282

MECHANICAL [KL]
COMPRESSION INSPECTION [KL]
1. Verify that the battery is fully charged. Charge it
again as necessary. (Refer to 01-17 BATTERY
INSPECTION.)
2. Warm up the engine to the normal operating
temperature.
3. Stop the engine and allow it to cool for about 10
minutes.
4. Perform “Fuel Line Safety Procedures”. Leave the
fuel pump relay removed. (Refer to 01-14
BEFORE REPAIR PROCEDURE.)
5. Remove the spark plugs.
6. Disconnect the ignition coil connector.
7. Install the
SST into the No.1 spark plug hole.
8. Fully depress the accelerator pedal and crank the
engine.
9. Record the maximum gauge reading.
10. Inspect each cylinder as above.
49 H 010 103
W 6 U 1 1 0 W 1 6
Compression
________________________________ kPa {kgf/cm2, psi) [rpm]
Standard 1,393(14.2, 202} [250]
Minimum 971 (9.9, 141} [250]
Maximum difference
between cylinders
196 kPa (2.0 kgf/cm2, 28 psi}
11. If the compression in one or more cylinders is low,
pour a small amount of clean engine oil into the
cylinder and check the compression again.
(1) If the compression increases, the piston,
piston rings, or cylinder wall may be worn.
(2) If the compression stays low, a valve may be
stuck or improperly seated.
(3) If the compression in adjacent cylinders stays
low, the cylinder head gasket may be
damaged or the cylinder head is distorted.
12. Remove the SST.
13. Connect the ignition coil connector.
14. Install the fuel pump relay.
15. Install the spark plugs.
Tightening torque
15— 22 N m {1.5—2.3 k g fm , 11— 16 ft lbf}
0 1 -1 OB-5