Webasto DBW 46 Repair Manual download pdf (Page 64)

Webasto Thermo & Comfort N.A., Inc. 64 www.techwebasto.com

REPAIR DBW 2010/2020/300 COOLANT HEATERS

9.4 MP SCHOOL BUS CIRCULATION PUMP

9.4.1 REMOVAL

1. Drain the coolant. Alternatively, the hoses leading

to the pump can be pinched closed with hose

clamping pliers.

2. Disconnect the circulation pump electrical leads.

3. Disconnect coolant hoses from pump.

4. Dismount coolant pump.

9.4.2 DISASSEMBLING

1. Clean the exterior of the pump and hold pump in a

soft-jaw vice.

2. Unscrew the impeller housing screws and remove

housing and O-ring.

3. Unscrew the impeller lock screw and remove

impeller.

4. Remove the seal assembly.

5. Remove the pump adapter (base).

6. Inspect all parts and replace if necessary. Seals are

always replaced.

9.4.3 ASSEMBLING

1. Connect pump motor to a power source. With a

strip of very fine emery cloth, polish the pump shaft

to remove any contamination.

2. Remove power source from pump motor.

3. Assemble pump with all parts in order as shown in

Fig. 53.

9.4.4 INSTALLING

1. Mount the pump.

2. Connect coolant hoses to pump and tighten hose

clamps.

3. Remove hose clamping pliers if used.

4. Connect the electrical leads and seal connector with

dielectric grease such as Permatex® Dielectric Tune-

up Grease or 3M™ Silicone Paste (Dielectric

Grease).

5. Refill coolant system and bleed trapped air out of

the coolant circuit according to instructions in

Sec.8.8.1.

6. Switch on and check function and for any leakage.

Figure 56: MP School Bus Circ. Pump - Exploded View

1 Impeller Housing

2 O-ring

3 Impeller

4 Spring Seal Assembly

5 Pump Base

6 Screw - Impeller Housing

7 Nut - Pump Base

8 Motor

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 70 71 72

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Webasto DBW 46 Repair Manual Page 64

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