Daewoo D50S-2, Service Manual

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Valve Depression
1) Install the valve (1) to the cylinder head (2).
2) Measure valve depression with a depth gauge or
calibrator from the bottom of cylinder head.
Seat insert and valve must be replaced if the
measured value exceeds the specified limit.
When replacing valve, the valve guide must be
surely replaced.
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Width of Valve Contact
1) Inspect the valve contact faces for the roughness
and unevenness.
Make valve contact surfaces smoothly.
2) Measure width of valve contact.
Seat insert must be replaced if the measured
value exceeds the specified limit.
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Replacement of Valve Seat Insert
<Removal of Valve Seat Insert>
1) Arc weld entire inside circumference of the valve
seat insert (2).(See figure)
2) Cool valve seat insert for a few minutes
to be easily pulled out.
3) Pull out the valve seat insert with a screw driver.
<Installation of Valve Seat>
1) Carefully place Jig (1).
Contact smoothly face of valve
seat insert.
2) Assemble valve insert by slow pressing against the
jig with the bench press.
(To need press 25000 Kg more)
EJM2041I
EJM2042I
EJM2043S
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EJM2044I
Standard Limit
Intake and Exhaust Valve Depression 1.0 mm 2.5 mm
Standard Limit
Valve Contact Width 1.5 mm 2.0 mm