EM0EH−03
S01361
Compression
Gauge
− ENGINE MECHANICALCOMPRESSION
EM−3
1996 RAV4 (RM447U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. DISCONNECT DISTRIBUTOR CONNECTOR
3. DISCONNECT HIGH−TENSION CORDS FROM SPARK
PLUGS AND IGNITION COIL
4. REMOVE 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.
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:
1,275 kPa (13.0 kgf/cm
2, 185 psi) or more
Minimum pressure: 932 kPa (9.5 kgf/cm
2, 135 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less
(e) 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, it is likely that
the piston rings and/or cylinder bore are worn or
damaged.
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. RECONNECT HIGH−TENSION CORDS TO SPARK
PLUGS AND IGNITION COIL
P13449
Z11716
No. 1
No. 2No. 3 No. 4No. 5
Mark
1, 2 or 3
Mark
0, 1 or 2
Mark
1, 2, 3, 4 or 5 No. 5
No. 4
EXAMPLE: Cylinder block ”2” + Crankshaft ”1”
= Total number 3 (Use bearing ”3”)
Number marked
Cylinder block
Crankshaft
Use bearing123
1
111 2
22
22
333445 000 EM−86
− ENGINE MECHANICALCYLINDER BLOCK
1996 RAV4 (RM447U)
(j) Measure the Plastigage at its widest point.
Standard clearance:
No. 3 STD
U/S 0.250.025 − 0.044 mm (0.0010 − 0.0017 in.)
0.027 − 0.067 mm (0.0011 − 0.0026 in.)
Others STD
U/S 0.250.015 − 0.034 mm (0.0006 − 0.0013 in.)
0.019 − 0.059 mm (0.0007 − 0.0023 in.)
Maximum clearance: 0.08 mm (0.0031 in.)
HINT:
If replacing the cylinder block subassembly, the bearing stan-
dard clearance will be:
No. 30.027 − 0.054 mm (0.0001 − 0.0021 in.)
Others0.017 − 0.044 mm (0.0007 − 0.0017 in.)
If the oil clearance is greater than maximum, replace the bear-
ings. If necessary, grind or replace the crankshaft.
HINT:
If using a standard bearing, replace it with one having the same
number. If the number of the bearing cannot be determined, se-
lect the correct bearing by adding together the numbers im-
printed on the cylinder block and crankshaft, then selecting the
bearing with the same number as the total. There are 5 sizes
of standard bearings, marked ”1”, ”2”, ”3”, ”4” and ”5” according-
ly.
Reference
Cylinder block main journal bore diameter:
Mark ”1”59.020 − 59.026 mm (2.3236 − 2.3239 in.)
Mark ”2”59.026 − 59.032 mm (2.3239 − 2.3241 in.)
Mark ”3”59.032 − 59.038 mm (2.3241 − 2.3243 in.)
Crankshaft main journal diameter:
Mark ”0”54.998 − 55.003 mm (2.1653 − 2.1655 in.)
Mark ”1”54.993 − 54.998 mm (2.1651 − 2.1653 in.)
Mark ”2”54.988 − 54.993 mm (2.1649 − 2.1651 in.)
