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2GENERAL DESCRIPTION
2-1
1 Combustion air fan
2 Motor
3 Electronic control unit
4 Electronic ignition coil
5 Ignition electrodes
6 Water pipes
7 Fuel nozzle
The Webasto Thermo 300 heater has been designed for use on large displacement diesel engines where a
high degree of operational flexibility is desired.
Additionally, the Thermo 300 heaters supplied to Detroit Diesel Corporation have been optimized to meet the
specific requirements of the Series 4000 Detroit Diesel engine.
The Webasto Thermo 300 heater is designed to:
1. Preheat Engine block of liquid cooled engines to help ensure reliable starting in cold weather and to reduce cold
start wear and emissions (white smoke).
2. Boost heating levels with the engine running. The heater will boost the charge-air cooling system in cold weather
when an engine is running at light loads or idling while helping to eliminate white smoke and fuel accumulation in
the vehicle exhaust system.
2. General Description
2.1 General Description
Fig. 2-1: Major Components of the Thermo 300 Coolant Heater
8 Temperature sensor
9 Overheat Thermostat
10 Heat exchanger
11 Combustion chamber
12 Combustion air swirler
13 Exhaust pipe
14 Photo disc
15 Flame detector
16 Fuel pump w/ solenoid valve
17 Combustion air adjusting shutter
18 Fuel supply/ return pipes
19 Coupler
20 Combustion air intake
WEBASTO THERMO 300