1989-Montero · engine 2'6 · страница 12 из 55 · Открыть оригинал PDF ↗
Caution
Cover the spark plug boles with shop towel, etc., in
order to keep expelled foreign objects from flying out,
and keep away from the holes. When measuring
compression with water, oil, or fuel having entered the
cylinder through a crack, etc., these will come flying out
of the spark plug hole hot and fast, so to sure to take
the proper precautions.
(6) Set the compression gauge to the spark plug hole.
(7) Holding the throttle valve full open, crank the engine and
measure compression.
Limit : 640 kPa (119 psi) 1256-400 rpml
(8) Perform (6) and (7) above for all the cylinders, ensuring
that compression pressure differential for each of the
cylinders is within the specified limit.
Limit : Less than 100 kPa (14 psi)
(9) If a cylinder’s compression or pressure differential exceeds
the limit, add a small amount of oil through the spark plug
hole and repeat steps (6) to (8).
0 If the addition of oil brings compression up, it is possi-
ble that there is harmful friction between the piston ring
and cylinder wall.
0 If not compression up, valve seizure, poor valve
seating, or a compression leak from the gasket are all
possible.
MANIFOLD VACUUM INSPECTION
(1) Before inspection, put the vehicle into the following cty
tion.
e Engine coolant temperature : 85-95°C (185205°F)
l Lights, motor cooling fan, and accessories : OFF
e Transmission : Neutral
e Steering wheel : Straight forward position
(2) Connect a tachometer.
(3) Disconnect the ventilation hose from the positive
crankcase ventilation valve, and then connect the hose to a
vacuum gauge.
(4) Start the engine and check that idle speed is within the
standard value range. Read off the vacuum gauge.
Standard value : 67 kPa (20 in.Hg)
Оригинальная страница руководства
