Flushing out oil cooler lines and oil cooler - AR27.55-P-0001SYZ

TRANSMISSION 722.9 in MODEL 221.0/1, 216.3, 204 with 4MATIC

Fig 1: Identifying Oil Cooler Lines And Oil Cooler Components (1 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Oil Cooler Lines And Oil Cooler Components (2 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Oil Cooler Lines And Oil Cooler Components (3 Of 3)

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

30.5.07

Kerosene cleaning agent replaced by 7-speed automatic transmission fluids (ATF, specification 236.12) for the flushing process.

Operation step 6

	Remove/install
		Before opening the hydraulic system the area surrounding the separation point should be cleaned thoroughly. Even the smallest dirt particles, introduced into the hydraulic components, can lead to malfunctions and a total failure of the hydraulic system.
1	Remove oil drain screws from the transmission oil pan and unscrew torque converter and drain transmission oil		*BA27.20-P-1001-01C
1			*BA27.10-P-1001-03D
2	Detach the double clamps and retaining clamps of the oil cooling lines (7, 8) and supply line (6) on the engine oil pan and on the transmission	Model 216, 221	AR27.55-P-0600SYZ
2		Model 204	AR27.55-P-0600CWX
3	Remove bolts of oil cooling lines (7, 8) and supply line (6) and pull oil cooling lines (7, 8) out of transmission and supply line (6) from the transfer case	Replace O-rings of oil cooling lines (7, 8) and O-ring of supply line (6).
3			*BA27.55-P-1002-01D
4	Remove restrictor (6a) and filter cartridge (6b) from supply line (6)	Replace restrictor (6a) and filter cartridge (6b) and pay attention to correct seat in the supply line (6).
5	Seal connector of oil cooling line (7)		Fig 5
	Flushing
6	Fill reservoir (3) of hand pump (2) with transmission oil		Fig 5
	Automatic transmission fluids (ATF, Specification 236.12)		Automatic transmission fluids (ATF, Specification 236.12). See https://bevo.mercedes-benz.com/index.php?language_id=1
7	Connect hand pump (2) to reservoir (3) with pressure fitting
8	Insert plastic hose on connection fitting (1) and connect corresponding connector (4) to the oil cooling line (8) and supply line (6)	Secure plastic hose to connection fitting (1) using hose clamp if necessary.
9	Operate hand pump (2) and flush out oil cooling line (8), supply line (6) and oil cooler with transmission oil	While flushing, the connector (4) from the supply line (6) must be removed and repositioned on the oil cooling line (7). Meanwhile the supply line (6) must be sealed with stop plugs. In the event of severe contamination change the transmission oil several times and ensure that the transmission oil flows freely.
9			Fig 5
10	Remove hand pump (2)
11	Install in the reverse order
12	Fill transmission with gear oil		AR27.00-P-0270SYZ
13	Read out fault memory with STAR DIAGNOSIS and erase if necessary
	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
14	Perform engine test run and check transmission for leaks with engine running