Doosan D35S-5 Service Manual page 62

Valve Seat Repair
1. Repair the valve face using valve refacer (1).
Valve seat angle is 45°.
2. To repair the valve seat, use the valve seat cutter
or valve seat grinder (1). After grinding, insert the
#400 or equivalent sand paper between cutter and
valve seat and grind lightly.
Repair the valve seat width and valve sinkage to
satisfy the specified limit.
D439E Service Manual
CAUTION
CAUTION
3. Install the valve seat using the caulking tool body
(1) and locking ring (2).
Press the valve seat (3) with the chamfered side
of the locking ring. And then, caulk it to the
cylinder head as the ring faces the other side.
4. Grind the seat width (A) and valve sinkage (B) to
be with in the standard.
Valve and valve seat should touch evenly all over
the surface.
Valve seat width (A)
Reference : 2.6 ~ 3.0 mm (Intake)
1.8 ~ 2.2 mm (Exhaust)
Limit : 3.6 mm (Intake)
2.8 mm (Exhaust)
Valve sinkage (B)
Reference : 1.5 m
Limit : 1.2 mm
60 2. Engine Mechanical System (D439E)
CAUTION