
BY Series Operation Manual iii
BY Series Operation Manual
TABLE OF
CONTENTS
Page
Record of Ownership ................................................. 2
Safety Precautions..................................................... 4
Before You Operate............................................. 4
During Operation and Maintenance..................... 5
Yanmar BY-Series Features and Applications......... 23
Component Identification ......................................... 25
Left Side - 4BY .................................................. 25
Right Side - 4BY ................................................ 25
Top View - 4BY.................................................. 26
Left Side - 6BY .................................................. 26
Right Side - 6BY ................................................ 27
Top View - 6BY.................................................. 27
Location of Label and Nameplates........................... 28
Function of Major Components................................ 29
Fuses and Relays .................................................... 31
Engine Cover ........................................................... 32
Diesel Fuel ............................................................... 39
Diesel Fuel Specifications ................................. 39
Filling the Fuel Tank .......................................... 40
Bleeding the Fuel System.................................. 41
Engine Oil................................................................. 42
Engine Oil Specifications................................... 43
Recommended Engine Oil................................. 44
Checking Engine Oil .......................................... 48
Adding Engine Oil.............................................. 48
Marine Gear or Stern Drive Oil................................. 49
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