Test coolant thermostat

AR20.10-P-2455RT

Test coolant thermostat

9.8.11

 

Remove/install

 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

1

Remove coolant thermostat (1)

 Installation:Install new sealing ring.

AR20.10-P-2460RT

 The coolant thermostat (1) must not be removed from the housing. Otherwise it will be destroyed. The housing is supplied together with a coolant thermostat (1) for repair purposes.



Checking

2

Heat coolant thermostat (1)

 Suspend coolant thermostat (1) from a wire in a vessel filled with water and heat water.

 For heating up under no circumstance use a welding torch or a soldering torch, otherwise sudden heat penetration modifies the metal structure!

3

Measure temperature of water

 The heating-up rate should be not more than 1 to 2°C / minute from about 8°C below start of opening of the coolant thermostat (1).

4

Heat water to the fully open temperature of thermostat (2) and then measure the stroke of the valve (2)

 If check values are not achieved, replace coolant thermostat (1).

Start of opening

*BE20.10-P-1001-02A

Minimum stroke

*BE20.10-P-1002-02A

5

Install in the reverse order

6

Inspect cooling system for leaks

AR20.00-P-1010GZ

 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

7

Conduct engine test run and check the engine for leaks

 In the event of oil loss determine and eliminate cause, otherwise malfunctions, transmission damage, and serious environmental pollution may occur.

Number

Designation

Engine
112,
Engine
113.940/941/
942/943/944/
945/946/948/
960/961/962/
963/964/965/
966/967/968/
971/980/981/
982/984/986/
987/988/990/
991/992/993/
995

BE20.10-P-1001-02A

Start of opening

°C

85...89

BE20.10-P-1002-02A

Minimum stroke

–

°C

102

–

mm

8