Fiat Kobelco EX355 Tier2, Technical Manual

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EX355 W5-3-49
ENGINE OVERHAUL
• Installation
1. Apply engine oil to the valve guide outer circumfer-
ence.
2. Set the ring to the valve guide replacer 5-8840-
2628-0.
3. Attach the valve guide replacer with ring to the
valve guide.
4. Use a hammer to drive the valve guide into posi-
tion from the cylinder head upper face.
5. Measure the height of the valve guide upper end
from the upper face of the cylinder head.
Valve Guide Upper End Height (Reference):
14.1 mm (0.56 in)
NOTE: If the valve guide has been removed, both the
valve and the valve guide must be replaced as a set.
VALVE AND VALVE SEAT INSERT
Valve Thickness
Measure the valve thickness. If the measured value is
less than the specified limit, the valve and the valve
guide must be replaced as a set.
Intake and Exhaust Valve Thickness
Intake Valve
Standard: 1.71 mm (0.067 in)
Limit: 1.30 mm (0.051 in)
Exhaust Valve
Standard: 1.75 mm (0.069 in)
Limit: 1.30 mm (0.051 in)
Valve Depression
1. Install the new valve ( 1 ) to the cylinder head ( 2 ).
2. Use a depth gauge or a straight edge with steel
rule to measure the valve depression from the
cylinder head lower surface. If the measured value
exceeds the specified limit, the valve seat insert
must be replaced.
Valve Depression
Intake Valve
Standard: 1.0 mm (0.039 in)
Limit: 2.5 mm (0.098 in)
Exhaust Valve
Standard: 1.3 mm (0.051 in)
Limit: 2.8 mm (0.110 in)
SM7125
SM7126
SM7127