XII Cylinder Head/Valve
Preparatory data-----------------12.1 Valve guide replacement-------------12.5
Fault diagnosis------------------12.2 Valve race fixing and adjustment---12.6
Cylinder head--------------------12.3 Cylinder head installation------------12.7
Valve Inspection---------------- 12.4
12.1 Preparatory Data
Precautions on Operation
To ensure sealing between cylinder head and cylinder body, there is a great bolt pretension on the cylinder head.
Pretension value: 50Nm.
All the components shall be cleaned before inspection and test, and purged with high-pressure air.
Function of cylinder head: Cylinder head is used to seal cylinder and form a combustion chamber with piston to
hold high-temperature and high-pressure fuel gas. It accomplishes air intake and exhausting operation with valve
mechanism.
Basic Data Unit:mm
Item Standard Service Limit
Cylinder cover flatness 0.03 0.05
Val ve
Val v e g u id e
Valve clearance
Intake 0.03-0.05 ＿
Exhaust 0.03-0.05 ＿
Valve stem OD
Intake 4.97-4.98 4.9
Exhaust 4.96-4.97 4.9
Valve guide ID
Intake 5 -5.012 5.1
Exhaust 5-5.012 5.1
Clearance between valve stem and valve guide
Intake 0.02-0.042 0.08
Exhaust 0.03-0.052 0.10
Valve race width Intake/Exhaust 0.7 1.5
Val v e s p ri n g
Rocker arm
Clearance
Rocker arm shaft OD
38.8 37.8
Intake/Exhaust 11.980-11.988 11.95
Val ve
Val v e g u id e
Rocker arm hole ID Intake/Exhaust 12-12.012 12.05
Clearance between rocker arm shaft and rocker arm hole Intake/Exhaust 0.012-0.032 0.08
Valve clearance Intake 0.03-0.05 ＿
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