Doosan D1146 - Valve seat contacting faces; Valve head thickness; Valve guide; Valve stem end play

•
Valve seat contacting faces
Check the valve seat contact surface for
any crack and wear, and if necessary,
correct with grinding paper, and if
excessive, replace it.
•
Valve head thickness
Measure the thickness of valve head
and if beyond the limit value, replace
the valve.
(2) Valve guide
•
Insert a valve into cylinder head and
measure the clearance between valve
guide and valve by valve movement. If
the clearance is excessive, measure the
valve and replace the excessively worn
valve or valve guide.
<Valve stem end play>
•
Assemble the valve at cylinder head’s
valve guide and see if it is centered with
the valve seat using a special tool.
- 81 -
Dimension
Standard Limit
Description
Intake valve stem 8.950~ 8.970 mm 8.93 mm
Exhaust valve stem 8.935~ 8.955 mm 8.91 mm
EFM2037I
Dimension
Standard Limit
Description
Intake valve 2.7 mm 1 mm or less
Exhaust valve 2.2 mm 1 mm or less
Measuring
position
EA0M4052
Standard Limit
Intake valve 0.04 ~ 0.07 mm 0.2 mm
Exhaust valve
0.06 ~ 0.09 mm 0.25 mm