Brixton BX125, Руководство по обслуживанию

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Service data 10.1
Fault Diagnosis
10.2
Cylinder head/Valve 10.3
10.1 Service Data
Function of cylinder head:
It is used to seal cylinder and form the combustion chamber along with the piston in order to
withstand high-temperature and high-pressure combustible gas. Through the valve system, the
cylinder head intakes and discharges gas.
Precautions:
To ensure seal between the cylinder head and cylinder body, the head withstand large locking tension force
from bolt. Locking-tension value: 30Nm.
All parts must be cleaned before being checked, and purged with high-pressure air.
Standard Value and Allowable Limit of Reference Items
Unit: mm
Item Standard Allowable limit
Valve
Valve guide
Valve stroke
Intake 0.04-0.06 -
Discharge 0.09-0.11 -
OD, valve rod
Intake 4.975-4.990 4.955
Discharge 4.955-4.970 4.958
OD, valve rod
Intake 5-5.012 5.03
Discharge 5-5.012 5.03
Clearance of valve rod and
valve guide
Intake 0.01-0.037 0.065
Discharge 0.03-0.057 0.082
Width, valve base
Intake 1.1-1.3 1.6
Discharge 1.0-1.2 1.6
Valve spring Free length
Intake 41.8 39.5
Discharge 41.8 39.5
Camshaft Stroke of camshaft and cylinder head 0.02-0.054 0.08
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