Cold Start Device; Trochoid Fuel Pump - Yanmar 3TNV82A Service Manual

Introduction

Cold Start Device

The Yanmar TNV model engines are equipped with
a cold start device (CSD).
The cold start device is located in the upper section
of the fuel injection pump and is connected to the
engine's cooling system.
• The cold start device improves engine starting at
lower temperatures. At engine cooling system
temperatures below 41°F (5°C), the cold start
device advances the fuel injection timing and
slightly increases the fuel injection volume.
• For approximately the first 5 minutes of operation,
the idle speed of the engine will be slightly
elevated.
CAUTION
Allow the engine to warm-up for at least
five minutes and the idle speed of the
engine to return to normal before
engaging the transmission or any PTOs.
Engaging the transmission or PTO at an
elevated engine speed could result in an
unexpected movement of the
equipment.
• When the cold start device is activated, you may
notice a slight increase in the exhaust smoke of
the engine during engine warm-up.
TNV DI Service Manual

Trochoid Fuel Pump

Note: The trochoid fuel pump located on the
side of the MP fuel injection pump is not
a "fuel supply" pump. The function of this
pump is to raise the pressure of the fuel
supplied by the electric fuel supply pump
to the internal fuel pressure required by
the MP fuel injection pump.
The use of an electric fuel supply pump is required
on all TNV model engines with the MP fuel injection
pump.
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FUEL SYSTEM
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