Check cylinders for leaks

AR01.00-P-1300MRD

Check cylinders for leaks

19.01.2017

Engine

274.9 in model 213

Engine

274.9 in model 238

Shown on ENGINE 274.910 in MODEL 213

01

Pressure loss tester

 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

Warm up engine to normal operating temperature

2

Switch off ignition and store transmitter key outside of transmission range (at least 2 m)

3

Remove spark plugs



AP15.10-P-1580CWF

4

Unscrew cap of coolant expansion reservoir

5

Remove oil filler cap

6

Remove engine air intake duct upstream of air filter

7

Attach TDC detection device to the cylinder to be checked

8

Rotate engine at crankshaft center bolt in direction of engine rotation until piston of cylinder to be checked is at top dead center (TDC)

 Socket wrench bit

*001589650900

9

Attach TDC detection device to the cylinder to be checked

10

Attach pressure loss tester (01) to the cylinder to be checked

AR01.00-P-1300-01VA

 Pressure loss tester

*450589172100

 Screw-in fitting

*270589019100



Check

11

Apply compressed air to the cylinder to be checked and read off pressure loss at pressure loss tester (01)

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-5001MRD



Install

12

Remove retaining lock

For an installed retaining lock.

AR03.30-P-5001MRD

13

Detach pressure loss tester (01)

 Pressure loss tester

*450589172100

14

Remove thread adapter

 Screw-in fitting

*270589019100

15

Install engine air intake duct upstream of air filter

16

Install the oil filler cap

17

Screw down cap of coolant expansion reservoir

18

Install spark plugs



AP15.10-P-1580CWF

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