EM-31
ENGINE MECHANICAL - Compression Check
(c) Fully open the throttle valve.
(d) While cranking the engine, measure the compression
pressure.
HINT: Always use a fully charged battery to obtain engine
revolution of 250 rpm or more.
(e) Repeat steps (a) through (d) for each cylinder.
NOTICE: This measurement must be done in as short
a time as possible.
Compression pressure:
IPZ and 1HZ
37.0 kg/cm
2
(526 psi, 3,628 kPa) or more
1HD-T
35.0 kg/cm
2
(498 psi, 3,432 kPa) or more
Minimum pressure:
IPZ and 1HZ
27.0 kg/cm
2
(384 psi, 2,648 kPa) or more
1HD-T
25.0 kg/cm
2
(356 psi, 2,452 kpa) or more
Difference between each cylinder:
5.0 kg/cm
2
(71 psi, 490 kPa) or less
(f) If the cylinder compression in one or more cylinders is
low, pour a small amount of engine oil into the
cylinder through the glow plug hole and repeat steps
(a) through (d) for the 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 stays low, a valve may be sticking or
seating improperly, or there may be leakage past the
gasket.
5. REINSTALL GLOW PLUGS
(See step 11 on page EM-81)
6. RECONNECT INJECTION PUMP (FUEL CUT
SOLENOID) CONNECTOR
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