Section 02 ENGINE
Subsection 10 (CYLINDER HEAD)
1
R1503motr157A
2
3
TYPICAL
1. Leak down tester gauge
2. Gauge adapter
3. Air supply hose
7. Note the amount of leaking or percentage (de-
pending on tester).
LEAKAGE
PERCENTAGE
ENGINE CONDITION
Up to 15%
Excellent condition
16% to 25%
Good condition
26% to 40%
Fair condition; engine will run
and
performance
might
be
down in some cases
41% and higher
Poor condition, diagnose and
repair engine
8. Proceed the same way with remaining cylin-
ders.
Diagnostic
Pressurize area to be tested, spray soap/water so-
lution at the indicated location and look and/or lis-
ten for air bubbles.
OBSERVATION
CAUSE
Air escaping on intake
port
Leaking intake valve(s)
Air escaping on
exhaust port
Leaking exhaust valve(s)
Air escaping into
crankcase
Excessively worn and/or
broken piston rings
Air bubbles out of
coolant tank
Leaking cylinder head
gasket
Air/water
escaping from
cylinder-block/head
Damaged gasket and/or
loosened screws
Coolant escaping from
water pump housing
Damaged gasket and/or
loosened screws (refer to
COOLING SYSTEM
)
Coolant escaping from
leak indicator hole
Damaged rotary seal on
water pump shaft (refer to
COOLING SYSTEM
)
Oily contamination on
leak indicator hole
Damaged oil seal on water
pump shaft
Reassembly
For reassembly, reverse the preparation proce-
dure. Use torque values and service products
from the exploded views (refer to proper
ENGINE
subsections).
Properly install ignition coils. Refer to
IGNITION
SYSTEM
subsection.
TROUBLESHOOTING
The following is provided to help in diagnosing the
probable source of problems. It is a guideline and
it should not be assumed to list all possible prob-
lems.
Always check for fault codes. If a fault code is de-
tected, service the fault code first. Refer to
EN-
GINE MANAGEMENT
section.
UNUSUAL ENGINE NOISE OR
VIBRATIONS
1.
Incorrect camshaft timing adjustment
- Replace damaged components and readjust
camshaft timing.
2.
Camshaft timing gear screws got loose
- Retighten screws with the recommended torque.
3.
Rocker arm(s) hydraulic element is broken or
worn out (improper valve adjustment).
- Replace faulty rocker arm(s).
smr2009-025
131
Содержание GTX Limited iS 255 2009
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