Inspect cylinder liner and piston for cracks · ar0140a0001a · Mercedes-Benz WIS

AR01.40-A-0001A

Inspect cylinder liner and piston for cracks

2.11.11

ENGINES 904.925 in MODEL 8AB390.053 /054

ENGINES 904.965 in MODEL 8AB390.053 /054

Inspect cylinder liner and piston for cracks

W01.40-1020-06

1 Inspection probe (flexible)

2 Endoscope

A Coolant mist

B Coolant trickle

	Checking
 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
	Notes on coolant		AH20.00-N-2080-01A
1	Check and correct fluid level
	Engine cooling system - check fluid level, adjust to correct level. Inspect anticorrosion/antifreeze protection, adjust to correct concentration		AP20.00-A-2010LA
 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
2	Start the engine, let it run at a medium rotational speed until the coolant temperature reaches approx. 80°C and maintain coolant temperature at this level for about 5 minutes	 Cover radiator if necessary.
3	Switch off engine and allow coolant to cool down to about 50°C.
4	Remove nozzle holder combinations
5	Attach cranking device to timing case		*904589046300
6	Remove cap on the expansion reservoir
7	Attach adapter and testing unit to expansion reservoir		*001589832100
			*655589006300
8	Pressurize cooling system at testing unit with compressed air	 Test pressure approx. 1.0 bar.
9	Crank crankshaft with cranking device until the piston of the cylinder to be inspected is positioned at BDC		*904589046300
10	Connect endoscope (2) and lead test probe (1) through the protective sleeve bore in the cylinder	Endoscope (cold light) gotis://A_01_02.1
11	Check cylinder barrel, cylinder head and piston crown	 On case of coolant mist (A) or coolant trickling (B): 
		Remove cylinder head to conduct further checks.
	Notes for evaluation of a cylinder barrel		AH01.40-N-0001-03A
	Notes on the assessment of pistons and piston rings		AH03.10-N-0001-04A
12	Inspect remaining cylinders in the same way
13	Install nozzle holder combinations
14	Remove cranking device on timing case		*904589046300
15	Relieve pressure in the cooling system, remove adapter and testing unit on expansion reservoir		*001589832100
			*655589006300
16	Install cap on the expansion reservoir

001 589 83 21 00

Adapter

Tester

Cranking device

904 589 04 63 00

655 589 00 63 00

Referenced documents

ah0140n000103a Notes for evaluation of a cylinder barrel
ah0310n000104a Notes on the assessment of pistons and piston rings
ah2000n208001a Notes on coolant
ap2000a2010la Engine cooling system - check fluid level, adjust to correct level. Inspect anticorrosion/antifreeze protection, adjust to correct concentration
as0000z000501a 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.
as2000z000101a Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.