Introduction; Cylinder Head Specifications; Adjustment Specifications; Cylinder Head - Yanmar 3TNV88F Service Manual

ENGINE

INTRODUCTION

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

CYLINDER HEAD SPECIFICATIONS

Adjustment Specifications

Valve clearance

Cylinder Head

Inspection item
Combustion surface distortion (flatness)
Intake
Valve recession
Exhaust
Seat angle
Valve seat
Seat correction angle

Intake/Exhaust Valve and Guide

Inspection item
Guide inside diameter
Valve stem outside diameter
Valve stem bend
Guide inside diameter
Valve stem outside diameter
Valve stem bend
Valve guide projection from cylinder head
Valve guide installation method
Valve stem seal projection from cylinder head
6-4
Standard
0.0020 in.
(0.05 mm) or less
0.0118 - 0.0197 in.
(0.30 - 0.50 mm)
0.0118 - 0.0197 in.
(0.30 - 0.50 mm)
Intake 120°
Exhaust 90°
40°, 150°
Standard
0.3154 - 0.3159 in.
(8.010 - 8.025 mm)
0.3132 - 0.3140 in.
Intake
(7.955 - 7.975 mm)
0.0014 - 0.0028 in.
(0.035 - 0.070 mm)
0.3156 - 0.3161 in.
(8.015 - 8.030 mm)
0.3132 -.3134 in.
Exhaust
(7.955 - 7.960 mm)
0.0018 - 0.0030 in.
(0.045 - 0.075 mm)
0.5791 - 0.5905 in.
(14.71 - 15.00 mm)
Cold-fitted
0.736 - 0.748 in.
(18.7 - 19.0 mm)
0.006 - 0.010 in. (0.15 - 0.25 mm)
Limit Reference page
0.0059 in.
(0.15 mm)
0.0315 in. See Valve recession on
(0.8 mm) page 6-24.
0.0315 in.
(0.8 mm)
–
See Valve face and valve
–
seat on page 6-24.
–
Limit Reference page
0.3189 in.
(8.10 mm)
0.3110 in.
(7.90 mm)
0.0071 in.
(0.18 mm)
See Inspection of valve
guides on page 6-23.
0.3189 in.
(8.10 mm)
0.3110 in.
(7.90 mm)
0.0071 in.
(0.18 mm)
–
See Reassembly of valve
guides on page 6-26.
–
See Reassembly of intake
– and exhaust valves on
page 6-26.
3TNV88F Service Manual
Introduction