1983 Toyota Tercel

[Engine Mechanical]-Emmission Control System-Fuel System-Cooling System-Lubrication System-Ignition System-Starting System-Charging System-Clutch-Transaxle-Propeller Shaft-Front Axle and Suspension-Rear Axle and Suspension-Brake System-Steering-Body Electrical System-Body-Air Conditioning System

Trouble Shooting-Engine Tune-Up-Idle HC/CO Concentration Check Method-[Compression Check]-Timing Belt-Cylinder Head-cylinder Block

COMPRESSION CHECK

Note: If there is lack of power, excessive oil consumption or poor fuel milage after engine tune up, measure the cylinder compression pressure.

WARM UP ENGINE
REMOVE FOUR SPARK PLUGS
MEASURE CYLINDER COMPRESSION PRESSURE
- Insert a compression gauge into the spark plug hole.
- Fully open the throttle.
- While cranking the engine with the starter motor, measure the compression pressure.
  NOTE: Always use a fully charged battery to insure that at least 250 rpm can be attained.
- Repeat steps for each cylinder
  Compression pressure: 12.5 kg/cm2 (178 psi)
  Minimum pressure: 9 kg/cm2 (128 psi)
  Difference between each cylinder: Less than 1.0 kg/cm2 (14 psi)
- If compression of one or more cylinders is low, pour a small amount of engine oil into that cylinder through the spark plug hole and repeat steps for cylinder with low compression.
  - If adding oil helps the compression, chances are that the piston rings and/or cylinder bore are worn or damaged.
  - If pressure remains low, a valve may be sticking or seated improperly, or there may be leakage past the gasket.