Introduction; Specifications; Test And Adjustment Specifications; Repair Specifications - Yanmar BY Series Service Manual

COOLING SYSTEM

INTRODUCTION

This section of the Service Manual describes the procedures necessary to service the 4BY2 and 6BY2
marine engine cooling systems.

SPECIFICATIONS

Test and Adjustment Specifications

Note: All pressure specifications are with engine at normal operating temperature.
Test Item
Cooling System Test
Pressure
Filler Cap Test Pressure
Thermostat

Repair Specifications

Coolant Capacity (Approximate)

Special Torque Chart

Component
Charge Air Cooler Bolt
Anode
7-4
Model
All
All
Marking
All 88°C
46 N·m (34 ft-lb)
25 N·m (18 ft-lb)
© 2009 Yanmar Marine International
Specification
1.4 bar (20 psi)
1.4 bar (20 psi)
Begins
Fully Open
Opening
88°C (190°F) 96°C (205°F)
4BY2
6BY2
Lubricating Oil
Torque
Application
Not Applied
Not Applied

Introduction

Reference Page
Pressure Test Cooling
System and Filler Cap
on page 7-7
Test Thermostat on
page 7-8
10.0 L (10.6 qt)
13.0 L (13.7 qt)
Reference Page
Remove and Install
Charge Air Cooler on
page 7-12
Check and Replace
Anodes on page 7-9
BY Service Manual