Compression Inspection - Toyota T100 1996 Service Manual

Compression Gauge
1996 TOYOTA T100 (RM449U)
ENGINE MECHANICAL (3RZ−FE)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1.
2.
3.
NOTICE:
Pulling on or bending the cords may damage the conductor
inside.
4.
5.
(a)
(b)
(c)
HINT:
Always use a fully charged battery to obtain engine speed of
250 rpm or more.
(d)
P15972
NOTICE:
This measurement must be done in as short a time as pos-
sible.
(e)
− COMPRESSION
WARM UP AND STOP ENGINE
REMOVE INTAKE AIR CONNECTOR
(See page EM−65)
DISCONNECT HIGH−TENSION CORDS FROM
SPARK PLUGS
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:
1,230 kPa (12.5 kgf/cm
Minimum pressure:
2
880 kPa (9.0 kgf/cm
Difference between each cylinder:
2
98 kPa (1.0 kgf/cm , 14 psi) or less
If the cylinder compression in one 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, chances are
S
that the piston rings and/or cylinder bore are worn
or damage.
If pressure stays low, a valve may be sticking or
S
seating is improper, or there may be leakage past
the gasket.
Author :
2
, 178 psi) or more
, 127 psi)
Date :
EM−3
EM06R−03
718