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% Excelle
nt 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
Airescapingonintake
port
Leaking intake valve(s)
Air escaping on
exhaust port
Leaking exhaust valve(s)
Air escaping into
crankcase
Excessively worn and/or
broken pisto
nrings
Air bubbles out of
coolant tan
k
Leaking cylinder head
gasket
Air/water
escaping f
rom
cylinder-block/head
Damaged gasket and/or
loosened screws
Coolant escaping from
water pump housing
Damaged ga
sket and/or
loosened screws (refer to
COOLING SYSTEM
)
Coolant escaping from
leak indicator hole
Damaged rotary seal on
water pump shaft (refer to
COOLING S
YSTEM
)
Oily contamination on
leak ind
icator 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).
Properl
y install ignition coils. Refer to
IGNITION
SYSTEM
subsection.
TROUBL
ESHOOTING
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.
UNUSU
AL ENGINE NOISE OR
VIBRA
TIONS
1. Incor
rect camshaft timing adjustment
- Replace damaged components and readjust
cams
haft timing.
2. Cams
haft 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).
-Rep
lace faulty rocker arm(s).
smr2009-025 131
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