Doosan DP158L Series, Руководство по эксплуатации и техническому обслуживанию

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10. Cylinder block/head
156
Valve
General Information
The overhead valves are actuated via chilled cast iron
tapets, push rods and rocker arms from the camshaft.
Check of Valve
After cleaning the valves with clean diesel oil, measure the
valve as follow.
1. Measure the valve stem’s outside diameter at upper,
middle, and lower to determine the wears and when the
wear limit is more than limit, replace the valves.
DV2213117A_E
2. inspect the scratch and wear of valve stem seal
contacting face, and if necessary correct with the grinding
paper but if severe replace it.
3. if valve head thickness becomes less than limit, replace
the valve.
EE1OM066
Check of Valve Guide
1. Inser the valve into valve guide and measure the clear-
ance between valve and valve guide by the shaking
degree of valve. If the clearance is bigger, measure the
valve and then replace the more worn valve guide.
DV2213119A_E
2. If the valve guide has already been replaced, measure
the center with valve seat if it deviates or not and if
abnormal it must be corrected.
Note) Simultaneously be processed when in guide reamer
process.
Valve Seat
1. Visual inspection: Inspect the damage and wear of valve
seat and if necessary replace.
Item Standard Limit
In.
Ø
11.969 ~
Ø
11.980mm
Ø
11.949mm
Ex.
Ø
11.945 ~
Ø
11.955mm
Ø
11.914mm
CAUTION
If the damage is severe, replace new one.
Item Standard Limit
In. 4.6 ~ 5.0mm 4.1mm
Ex. 4.33 ~ 4.83mm 3.83mm
Valve stem
Item Standard Limit
In. 0.020 ~ 0.049mm 0.10mm
Ex. 0.045 ~ 0.074mm 0.15mm
A
Measure
location