Remove oil from cooling and heating system

AR20.00-D-1250R

Remove oil from cooling and heating system

12.05.2020

Engine

646 in model 909

Modification notes

17.06.2015

Repair materials modified.

Operation step 2

29.09.2015

Repair procedure changed.

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW



Remove

1

Drain off coolant

AR20.00-D-1140R

Remove oil

2

Mix cleaning solution

 Observe safety and usage notes as well as environmental protection regulations from the cleaner manufacturer.

 Create 5-percent cleaning solution; to do this mix 10 l of clean water with 0.5 l of cleaner.

Cleaner for engine and cooling system for oil drag-in, 10 l

*BR00.45-Z-1009-04A

 Coolant

*BF20.00-N-1001-01A

3

Fill engine cooling system with cleaning solution

AR20.00-D-1140R

4

Set heater controls to maximum output


The heater of the vehicle must be set to the highest temperature stage.
The heater circuit will not be flushed otherwise.

5

Switch auxiliary heater to full output

Engine 646 in model 909
with code H12 (Auxiliary hot-water heater)
with code UZ1 (CORPORATE bus, 16+1-seater with center aisle)
with code UZ2 (MRT bus, 17+1-seater with center aisle)
with code UZ3 (MRT bus, 20+1-seater with center aisle)

6

Warm up engine to operating temperature at medium rotational speed

 Maintain operating temperature (about 80°C) for running engine for about 5 minutes.

7

Switch off engine and allow engine cooling system to cool to about 50°C

8

Drain off cleaning solution

AR20.00-D-1140R

 Observe safety and usage notes as well as environmental protection regulations from the cleaner manufacturer.

9

Fill engine cooling system with clean water

AR20.00-D-1140R

10

Warm up engine to operating temperature at medium rotational speed

 Maintain operating temperature (about 80°C) for running engine for about 5 minutes.

11

Switch off engine and allow engine cooling system to cool to about 50°C

12

Drain off water from engine cooling system

AR20.00-D-1140R



Check

13

Check engine cooling system for any cleaning solution residue and check for soiling

If there is any cleaning solution residue in the engine cooling system:



Repeat flushing process with clean water.

If there is dirt in the engine cooling system:



Repeat the cleaning process with new cleaning solution and a flushing process with clean water.



Install

14

Replace coolant thermostat

AR20.10-D-2461R

15

Add new coolant and check engine cooling system for leaktightness

AR20.00-D-1140R

 Engine cooling

Number

Designation

Engine 646.701 in model 909

BF20.00-N-1001-01A

Coolant

Total filling capacity

Liter

7,2

Corrosion/antifreeze down to -37 °C

Liter

3,6

Corrosion/antifreeze down to -45 °C

Liter

4

Sheet

BB00.40-P-0310-01A

Sheet

BB00.40-P-0325-00A

Sheet

BB00.40-P-0325-05A

Sheet

-

Repair materials

Number

Designation

Order number

BR00.45-Z-1009-04A

Cleaner for engine and cooling system for oil drag-in, 10 l

A 002 986 42 71