Webasto DBW 46 Repair Manual download pdf (Page 15)

www.webasto.us 15 Webasto Thermo & Comfort N.A., Inc.

DBW 2010/2020/300 COOLANT HEATERS GENERAL DESCRIPTION

2.1.8 COUPLING (4)

The coupling (clutch) provides the mechanical connection

between the motor and the combustion air fan.

Figure 8: Motor to Fan Coupling (Clutch)

NOTE: Before reusing the coupling, it has to

be checked for cracks, wear and the condition

of the flat portion of the center shaft hole. Too

much play on the shaft will result in a load

continuous noise.

2.1.9 TOOTHED GEARING (6)

The gears drive the fuel pump with a gear ratio of 1:3.5.

Figure 9: Fuel Pump Drive Gearing

NOTE: If signs of wear are showing within the

sector of the toothed gearing as well as at the

flat portion of the shaft hole of the large gear,

the gears will have to be replaced.

2.1.10 FUEL PUMP (24)

The fuel pump (single-staged toothed gear pump)

delivers the fuel from the tank to the heater and brings it

to a pressure of 10 ± 0.5 bar (145 ± 7 psi) for DBW

2010*, DBW 2020 and DBW 300.

*DBW 2010 equipped with a 0.35 Gal/hr. nozzle only.

For DBW 2010 with 0.40 Gal/hr. nozzle, the fuel

pressure should be set to 8 – 0.5 bar (116 – 7 psi).

Figure 10: Fuel Pump Assembly

2.1.11 FUEL CONTROL VALVE AND SOLENOID (8)

The fuel solenoid valve interrupts the fuel supply to the

atomizer nozzle when the heater is switched off and

during a control pause period. When there is no current

present, the solenoid valve is closed.

Figure 11: Fuel Solenoid Assembly

Strainer

Pressure

Regulation

Valve

Plunger Valve

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Webasto DBW 46 Repair Manual Page 15