Torque Specifications; Lubricants / Sealants / Adhesives; Special Tools; Description - Mercury MerCruiser D2.8L D-Tronic Service Manual

GLOW PLUG SYSTEM

Torque Specifications

NOTE: Securely tighten all fasteners not listed below.

Lubricants / Sealants / Adhesives

Special Tools

Description

The D-Tronic engines are not equipped with glow plugs as standard equipment. Description
and operation are explained in case the optional kit is installed.
This glow plug system consists of the ECT (Engine Coolant Temperature) sensor, the ECM,
two power supply relays, glow plug harness and four or six glow plugs. The time period dur-
ing which the glow plugs are turned ON (supplied 12 volts) depends directly on the tempera-
ture of the engine coolant as determined by the ECT sensor and the altitude of the engine
as sensed by the BARO pressure sensor located inside the ECM. The ignition OFF time in
which the engine can be restarted without the preheat cycle is about 20 seconds.
When the ignition switch is turned ON, a preheat indicator lamp will illuminate indicating that
the system is activated. Once proper engine temperature is reached (approximately 60 de-
grees C [140 degrees F.] ), the preheat indicator lamp goes out and an after-glow operation
of the glow plugs continues depending on the ECM signal. This cyclic operation of the glow
plugs provides for reduced white smoke during start-up, reduced cold engine noise and re-
duced emissions.

Precautions

Always disconnect battery cables from battery before working around electrical
system components to prevent injury, or damage to the electrical system.
Page 4C-4
Description
Glow Plug
Description
Liquid Neoprene
Description
Volt / Ohm Meter
WARNING
SERVICE MANUAL NUMBER 22
Nm lb-in. lb-ft
23 17
Part Number
92-25711--3
Part Number
91-93572
90-860074--1 FEBRUARY 2002