Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 06 compr insp
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EM-3
ENGINE MECHANICAL - COMPRESSION
COMPRESSION EM0AZ-04
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. REMOVE OUTER FR COWL TOP PANEL ASSEMBLY
(See page EM-76 )
2. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
3. REMOVE IGNITION COILS (See page IG-4 )
4. REMOVE SPARK PLUGS
Using a 16 mm plug wrench, remove the 6 spark plugs.
5. CHECK CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) Fully open the throttle.
(c) While cranking the engine, measure the compression
pressure.
Compression Gauge P19471
HINT:
Always use a fully charged battery to obtain engine speed of
250 rpm or more.
(d) Repeat steps (a) through (c) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression pressure:
1,500 kPa (15.3 kgf/cm2, 218 psi)
Minimum pressure:
1,000 kPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder:
100 kPa (1.0 kgf/cm2, 15 psi) or less
(e) 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.
S If adding oil helps the compression, it is likely that
the piston rings and/or cylinder bore are worn or
damaged.
S If pressure stays low, a valve may be sticking or
seating is improper, or there may be leakage past
the gasket.
6. REINSTALL SPARK PLUGS
7. INSTALL IGNITION COILS (See page IG-4 )
8. REINSTALL OUTER FR COWL TOP PANEL
ASSEMBLY (See page EM-82 )
2001 SIENNA (RM787U)
Author : Date : 946
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