Cub-cadet Yanmar 3TNV72 User Manual download pdf (Page 166)

FUEL SYSTEM

TNV IDI Service Manual

7-5

Introduction

INTRODUCTION

Figure 7-1

This section of the Service Manual describes the

procedures necessary to remove, install, and time

the ML fuel injection pump and its associated

system components. This fuel injection pump is

representative of the fuel injection pumps used on

other TNV IDI model engines.

Fuel Injection Pump

Note: If the ML fuel injection pump itself

requires servicing, it must be taken to an

authorized Yanmar FIE (Fuel Injection

Equipment) repair facility.

The following describes the features of the ML fuel

injection pump, manufactured by Yanmar.

The fuel injection pump is a very important

component of the engine. It is capable of making

very precise fuel delivery adjustments according to

the varied loads applied to the engine.

All of the fuel injection pump components are very

precisely machined. It is extremely important to

follow good service practices and maintain

cleanliness when servicing the fuel injection pump.

The Yanmar ML Fuel Injection Pump is an in-line

type pump which consists of a fuel supply plunger

(Figure 7-1, (1)) for each cylinder, a camshaft

(Figure 7-1, (2)), and a pump housing

(Figure 7-1, (3)). A delivery valve (Figure 7-1, (4))

connects to a high-pressure fuel line for each

cylinder. The fuel injection pump housing contains

a governor (Figure 7-1, (5)).

Fuel from the fuel tank to the fuel injection pump is

delivered by a low-pressure electric fuel pump. On

a few special models, a mechanical fuel pump is

used instead of an electric pump. The mechanical

fuel pump is mounted to the fuel injection pump

housing in place of the cover plate

(Figure 7-1, (6)).

Fuel to be injected into the cylinders is pressurized

by the up and down motion of each

camshaft-driven plunger, and is then supplied by

the high-pressure fuel lines to the respective fuel

injector.

(4)

(1)

(3)

(5)

(6)

(2)

0002238

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