Remove grease and scale in the cooling system

AR20.00-I-1030A

Remove grease and scale in the cooling system

14.12.10

Remove grease

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

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

AS00.00-Z-0005-01A

 Danger!

Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by 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



Notes on coolant

AH20.00-N-2080-01A

1

Drain coolant fully and collect



Replace coolant

Model 684 with engine 384

AP20.00-I-2080K



*BF20.00-N-1001-01H

2

Remove coolant thermostat

AR20.10-I-2460A

3

Fill cooling system with a 5% solution of a mildly alkaline cleaner and fresh water

 The specified cleaner can be used optionally.

The mixing ratio is 50 g cleaner to 1 liter fresh water.

Cleaner for engine and cooling system

*BR00.45-Z-1009-04A

4

Run engine until warm

 Warm up the engine at medium rotational speed
in driving mode until the coolant temperature reaches approx. 85°C and
maintain this temperature for about 5 minutes.

If necessary, the radiator can be covered over.

5

Switch off engine and allow coolant temperature to cool down to approx. 70°C

6

Drain solution fully form the cooling system

 Dispose of solution in an environmentally compatible manner.

7

Flush out cooling system

Flush cooling system 2 times with fresh water; run the engine with each flushing filling for about 5 minutes for this purpose  Dispose of product in compliance with clean water requirements.

Remove scale

8

Fill cooling system with a 10% solution of water and citric, tartaric or oxalic acid.

 Before removing scale, always remove grease in the cooling system even if there is no visible sign of oiling.

Chromic acid or products containing chrome must not be used because of the risk of contaminating wastewater.

It is preferable to use citric acid.

Mixing ratio: 100 g citric acid to 1 liter fresh water.
Chemicals for preparing solutions can be obtained from the chemical trade.
Commercially available products which contain the aforementioned acids, may also be used for removing scale and rust.

9

Run engine until warm

 Let the engine run at medium rotational speed in driving mode

until the coolant temperature reaches approx. 85°C and
maintain this temperature for about 10 minutes.

10

Switch off engine and allow coolant temperature to cool down to approx. 70°C

11

Drain solution fully form the cooling system

 Dispose of solution in an environmentally compatible manner.

12

Flush out cooling system

Flush cooling system at least 3 times with fresh water; run engine with each flushing filling for 5 minutes for this purpose

Dispose of water in an environmentally compatible manner.

13

Install coolant thermostat

AR20.10-I-2460A

14

Check coolant level; correct it



Correct engine cooling system liquid level

AP20.00-I-2011K

15

Check cooling and heating system for leaks



Cooling and heating system - check condition of radiator, lines and hoses

AP20.00-I-2050K

Number

Designation

Engine 384.906/907

BF20.00-N-1001-01H

Coolant

Total filling capacity

Liters

13.5

Anticorrosion/antifreeze agent down to -37°C

Liters

6.8

Anticorrosion/antifreeze agent down to -45°C

Liters

7.4

Specifications for Operating Fluids

Sheet

BB00.40-P-0311-00A

Sheet

BB00.40-P-0312-00A

Sheet

BB00.40-P-0325-03A

Sheet

BB00.40-P-0325-02A

Number

Designation

Order number

BR00.45-Z-1009-04A

Cleaner for engine and cooling system

-