Yanmar 2TNV70 - Cylinder Head Specifications; Adjustment Specifications; Cylinder Head; Introduction

ENGINE
6-4
TNV IDI Service Manual
Introduction
INTRODUCTION
This section of the Service Manual describes servicing of the engine.
CYLINDER HEAD SPECIFICATIONS
Adjustment Specifications
Cylinder Head
Model Valve Clearance
All
0.006 - 0.010 in.
(0.15 - 0.25 mm)
Inspection Item Standard Limit
Reference
Page
Combustion Surface Distortion (Flatness)
0.0020 in. (0.05 mm) or
less
0.0059 in.
(0.15 mm)
See Valve
Recession on
page 6-25
Valve Recession
Intake
0.0157 - 0.0236 in.
(0.4 - 0.6 mm)
0.0354 in.
(0.9 mm)
Exhaust
0.0157 - 0.0236 in.
(0.4 - 0.6 mm)
0.0315 in.
(0.8 mm)
Valve Seat
Seat Angle
Intake 120° -
See Valve Face
and Valve Seat
on page 6-26
Exhaust 90° -
Seat Correction Angle 40°, 150° -
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