EM±4
± ENGINE MECHANICALCOMPRESSION
1120 Author: Date:
2001 PRIUS (RM778U)
(e) If the cylinder compression in one 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.
7. REINSTALL SPARK PLUGS
8. REINSTALL IGNITION COIL (See page IG±7)
A10461
A10462
A10463
No. 1No. 2
No. 3
No. 4No. 5
No. 5
No. 4
No. 3
No. 2
No. 1
Number
Mark
Total number º º: Number mark
Cylinder block (A)
+
Crankshaft (B)
Use bearing0 ± 2 3 ± 5 6 ± 8 9 ±11
º1º
EXAMPLE: Cylinder block º4º (A)
+ Crankshaft º3º (B)
= Total number 7 (Use bearing º3º)º2º º3º º4º EM±68
± ENGINE MECHANICALCYLINDER BLOCK
2001 PRIUS (RM778U)
(e) Check each main journal and bearing for pitting and
scratches.
If the journal or bearing is damaged, replace the bearing.
If necessary, grind or replace the crankshaft.
(f) Place the crankshaft on the cylinder block.
(g) Lay a strip of plastigage acrose each journal.
(h) Install the bearing caps (See page EM±45).
Torque:
1ST 22 N´m (220 kgf´cm, 16 ft´lbf)
2ND Turn 90 °
NOTICE:
Do not turn the crankshaft.
(i) Remove the bearing caps (See procedure (a) and (b)
above).
(j) Measure the plastigage at its widest point.
Standard oil clearance:
0.010 ± 0.023 mm (0.0004 ± 0.0009 in.)
Maximum oil clearance:
0.07 mm (0.0028 in.)
If the oil clearance is greater then maximum, replace the bear-
ings. If necessary, 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 4 sizes
of standard bearings, marked º1º, º2º, º3º and º4º accordingly.
