Compression Pressure
Note. If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
Scheme 346
Scheme 347
- Warm up engine until the normal operating temperature (80~95°C (176-203°F)).
- Remove the surge tank. (Refer to Intake and exhaust system in this group)
- Disconnect the LH/RH ignition coil connectors (A) and then remove the ignition coils.
- Remove the spark plugs. Using a 16mm plug wrench, remove the 6 spark plugs.
- Check cylinder compression pressure. Insert a compression gauge into the spark plug hole. Fully open the throttle. Crank the engine over 7 times to measure compression pressure. NOTE: Always use a fully charged battery to obtain engine speed of 250 rpm or more. Repeat step 1 ) though 3 ) for each cylinder. NOTE: This measurement must be done in as short a time as possible. Compression pressure: 1, 029kPa (10.5kgf/cm 2 , 149psi) (250~400 rpm) Minimum pressure: 882kPa (9.0kgf/cm 2 , 128psi) Difference between each cylinder: 98kPa (1.0kg/cm 2 , 14psi) or less If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat step 1 ) through 3 ) for cylinders with low compression. If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
- Reinstall the spark plugs. Tightening torque: 14.7 ~ 24.5 N.m (1.5 ~ 2.5 kgf.m, 10.8 ~ 18.1 lb-ft)
- Install the ignition coils and ignition connectors. Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
- Install the surge tank. (Refer to Intake and exhaust system in this group)
Special Service Tools
Tool (Number and name) Illustration Use Crankshaft front oil seal installer (09231-3C100) Installation of the front oil seal Crankshaft pulley holder (09231-3M100) Removal and installation of the crankshaft pulley. (In vehicle use) Ring gear stopper (09231-2B100) Removal and installation of the flywheel and crankshaft pulley (Engine disassembly) Torque angle adapter (09221-4A000) Installation of bolts & nuts needing an angular method Valve stem seal remover (09222-29000) Removal of the valve stem seal Valve stem seal installer (09222-3C100) Installation of the valve stem seal Valve spring compressor & holder (09222-3K000) (09222-3K100) Removal and installation of the intake or exhaust valves 09222-3K000 09222-3K100 (holder) Crankshaft rear oil seal installer (09231-3C200) (09231-H1100) Installation of the crankshaft rear oil seal 09231-3C200 09231-H1100 Oil pan remover (09215-3C000) Removal of oil pan
