Introduction; Cylinder Head Specifications; Adjustment Specifications - Yanmar 4TNV98 Service Manual

Introduction

This section of the Service Manual describes
servicing of the engine.

Cylinder Head Specifications

Adjustment Specifications

Model
4TNV98
4TNE98
Cylinder Head
4TNV98 Engine
Inspection Item
Combustion Surface Distortion (Flatness)
4TNV98
Valve Recession
(4-Valve Head)
Seat Angle
Valve Seat
(4-Valve)
Seat Correction Angle
4TNE98 Engine
Inspection Item
Combustion Surface Distortion (Flatness)
Valve Sink
Valve Seat Angle
4TNV98 & 4TNE98 Diesel Engine
Valve Clearance
0.006 - 0.010 in.
(0.15 - 0.25 mm)
0.006 - 0.010 in.
(0.15 - 0.25 mm)
Standard
0.0020 in.
(0.05 mm) or less
0.0142 - 0.0220 in.
Intake (0.36 - 0.56 mm)
Exhaust 0.0138 - 0.0217 in.
(0.35 - 0.55 mm)
Intake
Exhaust
40°, 150°
Standard
0.0020 in.
(0.05 mm) or less
Intake 0.020 - 0.028 in.
(0.5 - 0.7 mm)
0.024 - 0.032 in.
Exhaust
(0.6 - 0.8 mm)
Intake
Exhaust
66
Valve Bridge Clearance
(4-Valve Head Only)
0
-
Limit
0.0059 in.
(0.15 mm)
0.0315 in.
(0.8 mm)
0.0315 in.
(0.8 mm)
120° -
90° -
-
Limit
0.0059 in.
(0.15 mm)
0.039 in.
(1.0 mm)
0.043 in.
(1.1 mm)
120° -
90° -
Section 3. Engine
Reference
Page
See Valve
Recession
on
Page 95
and 98.
See Valve
Face and
Valve Seat
on
Page 96
and 99.
Reference
Page
See
Inspection
of Cylinder
Head on
page 94.
See
Inspection
of Intake
and
Exhaust
Valves on
page 95.