EM-16
ENGINE MECHANICAL —
Compression Check
COMPRESSION CHECK
HINT: If there is lack of power, excessive oil consump-
tion or poor fuel economy, measure the cylinder com-
pression pressure.
1.
WARM UP AND STOP ENGINE
2.
DISCONNECT DISTRIBUTOR CONNECTOR
3.
DISCONNECT COLD START INJECTOR
CONNECTOR
4.
REMOVE SPARK PLUGS
5.
CHECK CYLINDER COMPRESSION PRESSURE
(a)
Insert a compression gauge into the spark plug hole.
(b)
Fully open the throttle valve.
(c)
While cranking the engine with the starter, measure
the compression pressure.
HINT: Always use a fully charged battery to obtain en-
gine revolutions of more than 200 rpm.
NOTICE: This measurement must be done for as short
a time as possible.
(d)
Repeat steps (a) through (c) for each cylinder.
Compression pressure:
10.5 kg/cm' (149 psi, 1,030 kPa) or more
Minimum pressure:
8.0 kg/cm
2
(114 psi, 785 kPa)
Difference between each cylinder:
0.5 kg/cm
2
(7 psi, 49 kPa) or less
(e)
If compression of one or more cylinders is low, pour
a small amount of engine oil into that cylinder
through the spark plug hole and repeat steps (a)
through (c) for the cylinder with low compression.
•
If adding oil helps the compression, probably the
piston rings and / or cylinder bore are worn or
damaged.
•
If pressure stays low, a valve may be sticking or
seated improperly, or there may be leakage past
the gasket surface.
6.
REINSTALL SPARK PLUGS
Torque: 180 kg-cm (13 ft-lb, 18 N•m)
7.
RECONNECT COLD START INJECTOR
CONNECTOR
8.
RECONNECT DISTRIBUTOR CONNECTOR
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