Doosan DB33A - Lower Face Warpage and Height; Valve Contact Width; Valve Depression; Valve Seat Angle

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Lower face warpage and height (mm)
2.3.2. Valve, Valve Guide and Valve Seat Insert
Valve contact width (mm)
Warpage
Thickness
(reference)
Standard
0.05 or less
(.002 in)
89.95¡›90.05
(3.54~3.55 in)
Limit
0.2
(.008 in)
89.75
(3.53 in)
Valve depression (mm)
Valve seat angle
Valve seat angle
Valve seat insert replacement
Removal : Arc weld the entire inside circumference of
the valve seat insert.
¡¡ ‹
Cooling the valve insert for a few minutes
and pull out with a screw driver.
Installation : Use a bench press to smoothly press the
valve seat insert.
Contact width
Depression
Welding bead
Valve seat
insert
Cylinder head
Standard
1.5
(.059 in)
Limit
2.0
(.079 in)
Standard
1.0
(.039 in)
Limit
2.5
(.098 in)