Test compression pressure

AR01.00-P-1200RX

Test compression pressure

21.2.08

 

Remove/install

1

Bring engine to operating temperature (approx. 80°C)

 Only test compression pressure when engine is at normal operating temperature.

2

Switch off ignition

3

Remove air filter housing

Engine 272, 273

AR09.10-P-1150RX

Engine 156

AR09.10-P-1150RMG

4

Remove ignition coils

Engine 272, 273

AR15.12-P-2003RX

Engine 156

AR15.12-P-2003RMG

5

Remove spark plugs

See Replace spark plugs:



Engine 272, 273

AP15.10-P-1580RX



Engine 156

AP15.10-P-1580RMG

6

 Connect up compression recorder (01)

AR01.10-P-0010-01R



Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A



*001589762100



*220589009900

7

Crank engine using contact switch of  compression recorder (01) for approx. 5 seconds

 To eliminate combustion residues from the cylinders.



Checking

8

 Press compression recorder (01) on tapped bore of spark plug for first cylinder

 The sealing cone of  compression recorder must airproof tapped bore of spark plug.

9

Turn the engine using the contact switch of the compression recorder (01) until the pressure no longer rises on the  compression recorder (01)

10

Carry out testing procedure in the cylinder order on the remaining cylinders in the same way

11

Compare measurements obtained with the specified pressures

*BE01.00-P-1001-01B

*BE01.00-P-1002-01B

*BE01.00-P-1003-01B

 If pressure measured is less than minimum compression pressure or if permissible difference between individual cylinders is exceeded:



Inspect cylinders for leaks

Engine 272, 273

AR01.00-P-1300RX

Engine 156

AR01.00-P-1300RMG

12

Install in the reverse order

Number

Designation

Engine
272

Engine
273

Engine
156

BE01.00-P-1001-01B

Compression installation tolerance or new value

bar

12 to 15

12...16

12...16

BE01.00-P-1002-01B

Compression pressure permissible difference between individual cylinders

bar

1.5

1.5

2.0

BE01.00-P-1003-01B

Compression pressure wear limit or limit value

bar

10

10

10