Remove/install timing case cover - AR01.40-P-8000MMB

ENGINES 157, 278 in MODEL 216, 221

Fig 1: Identifying Timing Case Cover Remove/Install Components

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

25.1.12

Value changed: Screw/bolt, timing case cover to cylinder crankcase, stage 1

Engine 278

*BA01.40-P-1001-01K

	Remove/install
1	Remove fan unit		AR20.40-P-5050MM
2	Detach vacuum hoses on the turbocharger adjusters
3	Remove charge air ducts		AR09.41-P-8620MMB
4.1	Remove ABC	Vehicles with code (487) Active Body Control (ABC)	AR32.50-P-0030MMB
4.2	Remove upper guide pulley at timing case cover (1)	Vehicles with AIRmatic	AR13.20-P-0001MMB
5	Rotate engine at crankshaft center bolt in direction of rotation of engine to a 40° crankshaft angle after top dead center (TDC) on cylinder 1	Rotate engine at crankshaft in direction of engine rotation up to a 40° marking on belt pulley/vibration damper matches the reference edge on the poly-V belt tensioning device.
6	Remove belt pulley/vibration damper		AR03.30-P-1600MM
7	Remove oil pan		AR01.45-P-7500MMB
8	Disconnect electrical connections for the engine oil pump valve on timing case cover and place electrical line to one side	Vehicles without 4MATIC. Ensure correct routing of the electrical line on oil dipstick guide tube.
9	Detach A/C compressor at timing case cover and place to one side with the connected lines		*BA83.55-P-1001-01M
10	Remove poly-V-belt tensioning device		AR13.20-P-0001MMB
11	Remove coolant thermostat		AR20.10-P-2460MMB
12	Detach coolant lines (2, 3) and coolant hose (4) if the charge air cooler on timing case cover (1)
13	Remove coolant pump		AR20.10-P-1271MMB
14	Remove oil filter housing		AR18.20-P-3471MMB
15	Remove oil cooler (5)		*BA18.30-P-1002-01G
16	Remove front cover	Right cover	AR01.30-P-5700MBR
16	Remove front cover	Left cover	AR01.30-P-5700MBL
17	Loosen screw/bolt (9a) on the right chain tensioner and pull out	It is essential that both bolts (9a, 9b) of the chain tensioner must be tightened with torque.	AR05.10-P-7800MMB
18	Remove screw/bolts (7) for the cylinder head (8) at timing case cover (1)	Remove screw/bolts (7) and fix with a cable tie (01).
18			*BA01.30-P-1002-01X
19	Remove bolts of timing case cover (1)	Observe different bolt lengths and diameters: ↓
		Bolt plan for the timing case cover (1)	AR01.40-P-8000-01MMB
			*BA01.40-P-1001-01K
20	Detach timing case cover (1)	Replace crankshaft radial sealing ring. Replace both seals in timing case cover (1) and apply sealant to sealing surface of the timing case cover (1): ↓
		Notes on sealant path for timing case cover (1).	AH01.40-P-1000-01MMB
			Figure
		Loctite 5970 sealant	*BR00.45-Z-1013-01A
	Clean
21	Clean sealing surfaces	Do not use any sharp-edged tools or abrasive paper as this will damage the sealing surfaces.	AR01.00-P-0050-01A
		Loctite 7200	*BR00.45-Z-1038-04A
		Loctite 7063 cleaning spray (150 ml)	*BR00.45-Z-1046-04A
22	Install in the reverse order
23	Check engine oil level; correct if necessary		AP18.00-P-0101SX
	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
24	Carry out an engine test run and check engine for leaks		AS00.00-Z-0005-01A
25	Inspect cooling system for leaks		AR20.00-P-1010SX

CYLINDER HEAD

Number	Designation			Engine 157	Engine 278
BA01.30-P-1002-01X	Screw/bolt, cylinder head to timing case cover/crankcase	M7	Nm	14	14

REFRIGERANT COMPRESSOR

Number	Designation		Engine 157	Engine 278
BA83.55-P-1001-01M	Screw/bolt, refrigerant compressor to timing case/crankcase/engine support	Nm	20	20

OIL COOLING SYSTEM

Number	Designation		Engine 157	Engine 278
BA18.30-P-1002-01G	Screw/bolt, oil-water heat exchanger to timing case cover	Nm	8	8

CRANKCASE, TIMING CASE COVER, END COVER

Number	Designation			Engine 157	Engine 278
BA01.40-P-1001-01K	Screw/bolt, timing case cover to cylinder crankcase	Stage 1	Nm	20	10
BA01.40-P-1001-01K	Screw/bolt, timing case cover to cylinder crankcase	Stage 2	Nm	-	20

Fig 2: Identifying Squeeze Gun (112 589 00 25 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1013-01A	Loctite 5970 sealant	A 003 989 98 20
BR00.45-Z-1038-04A	Loctite 7200	Henkel Loctite Deutschland GmbH
BR00.45-Z-1046-04A	Loctite 7063 cleaning spray (150 ml)	A 001 986 71 71 10