Mitsubishi S4L User Manual

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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
CYLINDER HEAD AND VALVE
MECHANISM
ENGLISH
INSPECTION
5. Valve refacing
1) Set the valve refacer at an angle of 45° and
grind the valve.
2) The valve margin must be not less than the
limit. If the margin seems to be less than the
limit when the valve is refaced, replace the
valve.
6. Valve seat refacing
1) Before refacing the valve seat, check the
clearance between the valve and guide, and
replace the guide if necessary.
2) Cut the valve seat with a valve seat cutter
(commercially available), or grind it with a
valve seat grinder, and finish the width of
valve seat and the angle of seat face to the
correct values.
Unit: mm (in.)
3) After refacing the valve seat, put lapping
compound on the valve face and lap the valve
in the valve seat.
Figure 74 Refacing valve face
Figure 75 Refacing valve seat
Figure 76 Valve seat width and valve face angle
Width of valve seat 1.3
to 1.8 mm
(0.051 tot 0.071 in.)
Item Standard Limit
Angle of seat face 45° —
Width of valve seat 1.3 to 1.8
(0.051 to 0.071)
2.5
(0.098)

Mitsubishi S4L Specifications

General

Brand	Mitsubishi
Model	S4L
Category	Engine
Language	English