Check combustion chambers for leaks

AR01.00-P-1400MND

Check combustion chambers for leaks

03.02.2017

Engine

276.8 in model 213, 238

1

Pressure loss tester

2

Threaded adapter

 Caution

Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil

Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.

AS18.00-Z-0001-01A

 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 injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 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 buttoned-up and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A



Remove

1

Start engine and bring to operating temperature

 Only check cylinder leakage when the engine is at normal operating temperature.

2

Switch off ignition and store transmitter key outside of transmission range (min. 2 m)

3

Remove spark plugs



AP15.10-P-1580D

4

Remove screw cap of coolant expansion reservoir coolant

5

Remove oil filling cover

6

Remove engine air intake ducts upstream of air filters

7

Remove lower front and center lower engine compartment paneling

AR61.20-P-1105LWE

8

Attach dead center position finder on the cylinder to be checked

9

Remove charge air cooler and place to one side with attached coolant hoses

AR09.41-P-6817MND

10

Rotate engine at crankshaft center bolt in direction of engine rotation to top dead center (TDC) (ignition TDC) on cylinder to be checked

 Socket wrench bit

*001589650900

11

Remove dead center position finder from the cylinder to be checked

12

Attach pressure loss tester (1) to the cylinder to be checked

AR01.00-P-1400-01MND

 Pressure loss tester

*450589172100

 Screw-in fitting

*270589019100



Check

13

Pressurize cylinder to be checked with compressed air and read off pressure loss at the pressure loss tester (1)

Cylinder leakage: permissible loss total indication

*BE01.00-P-1001-02Z

Cylinder leaktightness: Permissible losses at valves and cylinder head gasket

*BE01.00-P-1002-02Z

Cylinder leaktightness: Permissible losses at pistons and piston rings

*BE01.00-P-1003-02Z

If the crankshaft rotates.



Install retaining lock for crankshaft / starter ring gear.

AR03.30-P-5000MND

 Screw/bolt, transmission to engine

*BA27.10-P-1001-04H

 Retaining lock

*112589034000

 Socket wrench bit

*001589650900



Install

14

Remove retaining lock

If the retaining lock was installed.

AR03.30-P-5000MND

15

Disconnect the pressure loss tester (1)

AR01.00-P-1400-01MND

 Pressure loss tester

*450589172100

16

Remove thread adapter (2)

AR01.00-P-1400-01MND

 Screw-in fitting

*270589019100

17

Install charge air cooler

AR09.41-P-6817MND

18

Install lower front and center engine compartment paneling

AR61.20-P-1105LWE

19

Install spark plugs



AP15.10-P-1580D

20

Install engine air intake ducts upstream of air filters

21

Attach oil filling cover

22

Attach screw cap of coolant expansion reservoir coolant

Cylinder leakage

Number

Designation

Engine all (4xWD, CAR, smart)

BE01.00-P-1001-02Z

Cylinder leakage: permissible loss total indication

%

 25

Cylinder leakage

Number

Designation

Engine all (4xWD, CAR, smart)

BE01.00-P-1002-02Z

Cylinder leaktightness: Permissible losses at valves and cylinder head gasket

%

 10

Cylinder leakage

Number

Designation

Engine all (4xWD, CAR, smart)

BE01.00-P-1003-02Z

Cylinder leaktightness: Permissible losses at pistons and piston rings

%

 20

 Automatic transmission complete

Number

Designation

Transmission 725.0

BA27.10-P-1001-04H

Screw/bolt, transmission to engine

Nm

39