D439E Service Manual 2. Engine Mechanical System (D439E)
60
Valve Seat Repair
1. Repair the valve face using valve refacer (1).
CAUTION
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.
CAUTION
Repair the valve seat width and valve sinkage to
satisfy the specified limit.
3. Install the valve seat using the caulking tool body
(1) and locking ring (2).
CAUTION
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
To Next Page
Loading...
