Inspect cylinders with a light probe

AR01.00-P-0200GW

Inspect cylinders with a light probe

08.08.2019

Engine

157, 279 in model 463

Engine

176 in model 463

up to model year 2019

Modification notes

05.08.2019

Notes document AH05.30-P-1000-02SZ added.

Operation step 6.

1

Endoscope with test probe

 

Remove/install

1

Remove spark plug of the cylinder to be checked.



Engine 279 in model 463

AP15.10-P-1580GW



Engine 157 in model 463

AP15.10-P-1580AD



Engine 176 in model 463
up to model year 2019

AP15.10-P-1580C

2

Remove bottom engine compartment paneling.

Engine 176 in model 463.234
up to model year 2019
with code ZQ0 (G 500 4x42)

AR61.20-P-1105GWX

Engine 157, 279 in model 463
as of model year 2016 up to model year 2019
except code ZQ0 (G 500 4x42)
Engine 176 in model 463
as of model year 2016 up to model year 2019
except code ZQ0 (G 500 4x42)

AR61.20-P-1105GW

3

Detach circulation pump for low-temperature water circuit and place to one side with lines and hoses attached.

Engine 176 in model 463
up to model year 2019
Engine 279 in model 463

Engine 176 in model 463
up to model year 2019

AR09.41-P-6925MNF

4

Rotate engine at crankshaft center bolt in the direction of engine rotation until piston of cylinder to be checked is at bottom dead center.

 Socket wrench bit

*001589650900

5

Connect endoscope with test probe(1) and insert test probe through the spark plug threaded bore in the cylinder to be checked.



000 588 01 21 00 Endoscope

WS01.00-P-0097B



Check

6

Check cylinder barrels, piston crown, and valves.

General information on checking valves, valve seats and valve guides

AH05.30-P-1000-02SZ

Notes on the assessment of pistons and piston rings

AH03.10-P-0001-04MM

General information on inspecting cylinder walls

Engine 176 in model 463
up to model year 2019

AH01.00-P-0300-01AMG

General information on inspecting cylinder walls

Engine 157, 279 in model 463

AH01.00-P-0300-01VA

If the condition of the cylinder barrels is not clearly recognizable,



Remove the relevant cylinder head.

Right cylinder head
Engine 279 in model 463

AR01.30-P-5780MUB

Left cylinder head
Engine 279 in model 463

AR01.30-P-5770MUB

Right cylinder head
Engine 176 in model 463
up to model year 2019

AR01.30-P-5780MNA

Left cylinder head
Engine 176 in model 463
up to model year 2019

AR01.30-P-5770MNA

Left cylinder head
Engine 157 in model 463

AR01.30-P-5770GW

Right cylinder head
Engine 157 in model 463

AR01.30-P-5780GW

7

Install in the reverse order.