Toyota T100 1996 Service Manual page 830

EM−2
1996 TOYOTA T100 (RM449U)
ENGINE MECHANICAL (5VZ−FE)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1.
Allow the engine to warm up to normal operating temperature.
2.
3.
4.
(a)
(b)
(c)
HINT:
Always use a fully charged battery to obtain engine speed of
250 rpm or more.
(d)
P21054
NOTICE:
This measurement must be done in as short a time as pos-
sible.
(e)
5.
− COMPRESSION
WARM UP AND STOP ENGINE
REMOVE HIGH−TENSION CORDS WITH IGNITION
COILS (See page IG−1)
REMOVE SPARK PLUGS
CHECK CYLINDER COMPRESSION PRESSURE
Insert a compression gauge into the spark plug hole.
Fully open the throttle.
While cranking the engine, measure the compression
pressure.
Repeat steps (a) through (c) for each cylinder.
Compression pressure:
1,200 kPa (12.2 kgf/cm
Minimum pressure:
1,000 kPa (10.2 kgf/cm
Difference between each cylinder:
2
100 kPa (1.0 kgf/cm
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 steps (a) through (c) for
cylinders with low compression.
If adding oil helps the compression, it is likely that
S
the piston rings and/or cylinder bore are worn or
damaged.
If pressure stays low, a valve may be sticking or
S
seating is improper, or there may be leakage past
the gasket.
REINSTALL SPARK PLUGS
Author :
2
, 174 psi) or more
2
, 145 psi)
, 15 psi) or less
Date :
EM06C−05
821