Remove/Install Connection Fittings For Coolant Hoses - Ar20.20-D-7470WE

Engine 651.955/956/957 in model 906

MODIFICATION NOTES

27.01.2016	Work procedure completely revised	Operation steps 1 to 32
29.03.2016	Screw connection piece coolant to charge air distributor	Motor 651 im Typ 906	*BA20.10-N-1009-01Q

Shown: Version "A"

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

Shown: Version "A" without code MS3 (Engine version Euro 3)

Courtesy of MERCEDES-BENZ USA

Shown: Version "B"

Courtesy of MERCEDES-BENZ USA

	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
	Remove
1	Drain off coolant		AR20.00-D-1140SD
2	Remove exhaust gas recirculation cooler (21)		AR14.20-D-7665WE
3	Unfasten cable duct (12) for engine wiring harness (13)		AR01.00-D-2411-01WE
4	Remove vacuum reservoir	Engine 651.955/957 in model 906	AR07.09-D-0001WE
5	Open clamp and remove coolant hose (22)	Engine 651.955/956/957 in model 906 except code MS3 (Engine version EURO 3)
6	Open clamp and remove coolant hose (5) from the connection fitting (1)	Hose clamp pliers	Figure
7	Unclip retaining clamp (14) on bracket (19) and push engine wiring harness (13) to the side
8	Remove fuel filter (15) upwards out of the connection fitting (1) and place to one side	For this purpose open clips (17). Do not remove fuel hoses from fuel filter (15).
9	Remove bracket (10)	To do this, remove screw/bolts (11). Set of flexible head wrenches	Figure
10	Open clamps and remove coolant hoses (4, 7, 8) from connection fitting (1)	Hose clamp pliers	Figure
11	Open clamp (20) and push as far as possible in the direction of cable duct (12) until the connection fitting (1) can be removed	Hose clamp pliers	Figure
12	Remove screw/bolts (3) and lay holder (18) to the side with fuel hose (16)	Only for version "A" of the connection fitting (1). Set of flexible head wrenches	Figure
12.1	Remove bracket for fuel pressure sensor on connection fitting (1)	Only for version "B" of the connection fitting (1).
13	Remove screws/bolts (2.1, 2.2)	Only for version "A" of the connection fitting (1). Set of flexible head wrenches	Figure
13.1	Remove screw/bolts (24, 25, 26) i33L,	Only for version "B" of the connection fitting (1). Set of flexible head wrenches	Figure
14	Remove connection fitting (1)	To do this raise connection fitting (1) and remove out of coolant hose (9).
	Check
15	Check clamp (20) and coolant hose (9) for damage	Depending on findings ↓ Replace clamp (20) and coolant hose (9)
16	Check version of the connection fitting (1)	Only when replacing the connection fitting (1). Version "A" of the connection fitting (1) differs from version "B" of the connection fitting (1) in the number of fastening locations present. Use new connection fittings (1) according to the version.
	Install
17	Install connection fitting (1)	Do not use lubricant or liquid seal. Leaks and damage may occur otherwise. Always replace sealing ring (6) on connection fitting (1).
18	Screw in screw/bolt (3)	Only for version "A" of the connection fitting (1). To do this fasten bracket (18) using a fuel hose (16). Do not yet tighten screw/bolts (3). Set of flexible head wrenches	Figure
19	Screw in screws/bolts (2.1, 2.2)	Only for version "A" of the connection fitting (1) First tighten the screw/bolt (2.1), then tighten the screw/bolt (2.2). Bolt, coolant connection fitting to cylinder head	*BA20.10-N-1006-01Q
		Set of flexible head wrenches	Figure
19.1	Screw in screw/bolts (24, 25, 26)	Only for version "B" of the connection fitting (1). Screw in screw/bolts (24, 25, 26) and then tighten in the numerical sequence. Bolt, coolant connection fitting to cylinder head	*BA20.10-N-1006-01Q
		Set of flexible head wrenches	Figure
20	Tighten screw/bolts (3)	Only for version "A" of the connection fitting (1). Bolt, coolant connection fitting to charge air distributor	*BA20.10-N-1009-01Q
		Set of flexible head wrenches	Figure
21	Fasten clamp (20)	Attach clamp (20) in such a way that the bracket (10) can be installed. Position clamp (20) between markings on the coolant hose (9).
22	Attach coolant hoses (4, 7, 8) to connection fitting (1)	Position clamps between markings on coolant hoses (4, 7, 8). Hose clamp pliers	Figure
23	Install bracket (10)	Screw in screw/bolts (11) to do this. Bolt, bracket to cylinder head	*BA14.20-N-1028-01H
		Set of flexible head wrenches	Figure
24	Position fuel filter (15) and fasten in place using clamps (17)
25	Fasten engine wiring harness (13) in place
26	Install coolant hose (22)	Engine 651.955/956/957 in model 906 except code MS3 (Engine version EURO 3) Replace clamp if necessary.
27	Attach coolant hose (5) to connection fitting (1)	Position clamp between markings on the coolant hose (5). Hose clamp pliers	Figure
28	Install vacuum reservoir	Engine 651.955/957 in model 906	AR07.09-D-0001WE
29	Attach cable duct (12) for engine wiring harness (13)		AR01.00-D-2411-01WE
30	Install exhaust gas recirculation cooler (21)		AR14.20-D-7665WE
31	Pour in coolant		AR20.00-D-1140SD
	Check
32	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. Check for leaktightness with engine running	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. Visual inspection only.	AS00.00-Z-0005-01A