DESCRIPTION - ENGINE COVER
The engine cover is a black plastic cover used to
cover the top of the engine (Fig. 2).
STANDARD PROCEDURE
STANDARD PROCEDURE - COMPRESSION
TESTING ENGINE
(1) Warm up engine to operating temperature
(approx. 80 °C ).
(2) Shut off engine.
(3) Remove engine cover (Refer to 9 - ENGINE -
REMOVAL).
(4) Remove glow plugs (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/GLOW PLUG - REMOVAL).
(5) Crank engine several times with the starter to
eliminate combustion residues in the cylinders.
(6) Insert compression tester adapter with check
valve installed into glow plug hole of cylinder to be
tested.
(7) Test compression pressure by cranking engine
with starter for at least 8 revolutions.
(8) Carry out test procedure at the remaining cyl-
inders in the same way.
(9) Compare pressure readings obtained with the
specified pressures. If the pressure reading is below
the minimum compression pressure or if the permis-
sible difference between the individual cylinders is
exceeded. Refer to cylinder leak down test.
(10) Remove compression tester and adapter from
cylinder head.
(11) Install glow plugs (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/GLOW PLUG - INSTALLA-
TION).
(12) Install engine cover (Refer to 9 - ENGINE -
INSTALLATION).
INSPECTING
NOTE: If crankshaft rotates, install retaining lock for
crankshaft/ring gear.
(1) Pressurize cylinder with compressed air and
read off pressure loss at cylinder leak tester. If exces-
sive pressure loss exists, determine cause. Refer to
(DETERMINING PRESSURE LOSS OF CYLIN-
DERS).
NOTE: If the retaining lock is installed, remove it,
rotate engine and install lock once again.
(2) Carry out test of other cylinders in the firing
order of engine.
STANDARD PROCEDURE - CHECKING OIL
PRESSURE
(1) Remove engine cover (Refer to 9 - ENGINE -
REMOVAL).
(2) Remove oil galley plug together with seal at
timing case cover.
(3) Screw oil pressure gauge adaptor fitting
together with seal onto timing case cover.
(4) Connect oil pressure gauge to adaptor fitting.
(5) Check oil level, adjust with correct engine oil if
necessary.
(6) Insert temperature of remote thermometer into
oil level indicator tube.
WARNING: USE EXTREME CAUTION WHEN ENGINE
IS OPERATING. DO NOT STAND IN A DIRECT LINE
WITH FAN. DO NOT PUT YOUR HANDS NEAR PUL-
LEYS, BELTS OR FAN. DO NOT WEAR LOOSE
CLOTHES.
CAUTION: Ensure that fan and accessory drive belt
DO NOT damage oil pressure gauge hose.
(7) Start engine and bring to operating tempera-
ture 90°C (194°F).
(8) Record engine oil pressure at idle.
(9) Raise engine speed to 3000 rpm and record oil
pressure.
Fig. 2 ENGINE COMPARTMENT
1 - COOLANT PRESSURE CONTAINER
2 - ENGINE COVER
3 - RADIATOR
WG ENGINE 9a - 3
ENGINE - 2.7L DIESEL (Continued)
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