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

FUEL SYSTEM

INTRODUCTION

This section of the Service Manual describes the procedures necessary to remove, install, and repair fuel
system components as used on the Yanmar 4BY and 6BY engines.

SPECIFICATIONS

Test and Adjustment Specifications

Inspection Item
High-Pressure Fuel
Pump Pressure
Fuel Feed Pump
Pressure (Minimum)
Return Fuel Pressure
(Maximum)
Fuel Supply Restriction
(Maximum)
Fuel Temperature
6-6
Minimum at cranking
Minimum at low idle
Maximum at 4000 rpm
All speeds
All speeds
All speeds
Maximum before speed reduction begins
Specification
250 bar (3625 psi)
400 bar (5800 psi)
1600 bar (23,200 psi)
5.0 bar (73 psi)
200 mmAq (7.87 in.Aq)
0.1 bar (40 in.Aq)
80°C (176°F)
BY Service Manual
Introduction
Reference Page
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See Measuring Fuel
Feed Pump Pressure
on page 6-11
See Testing Return
Fuel Pressure on
page 6-12
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