BMW 7 Series: Removing And Installing/Replacing Gearbox Oil Cooler For Automatic Transmission (N63, N74)

IMPORTANT: Risk of scalding! Only perform this repair work after engine has cooled down.

Necessary preliminary work

• Drain COOLANT.
• Remove FAN COWL.

Recycling

Catch and dispose of drained coolant in a suitable container.

Transmission oil emerges when engine oil lines are detached from transmission oil cooler.

Catch and dispose of escaping transmission oil in a suitable container.

Observe country-specific waste disposal regulations.

Release and disconnect coolant hoses (1).

Unlock transmission oil lines (2) and detach.

Remove transmission oil cooler (3).

NOTE: When replacing transmission oil cooler (3), modify THERMOSTAT INSERT (4).

Fig. 83: Identifying Transmission Oil Cooler, Coolant Hoses, Transmission Oil Lines And Thermostat Insert

NOTE: Assemble engine.

Check OIL LEVEL in automatic transmission. If necessary, top up automatic transmission fluid.

REMOVING AND INSTALLING/REPLACING TRANSMISSION OIL COOLER (ALPINA B7 N63)

WARNING: Risk of scalding! Only perform this work after engine has cooled down.

IMPORTANT: Wear safety goggles and protective gloves.

Necessary preliminary work

• Remove front BUMPER TRIM

IMPORTANT: Adhere to conditions of absolute cleanliness when working on the transmission oil circuit.

To avoid transmission damage, do not allow any dirt particles to get into the transmission oil circuit.

Recycling

Transmission oil escapes when oil lines are released. Catch and dispose of escaping transmission oil.

Observe country-specific waste disposal regulations.

Release screw (1) on line clip.

Tightening torque 17 22 1AZ.

Fig. 84: Identifying Line Clip Mounting Screws

Release bolt (1) on transmission oil cooler.

Tightening torque 17 22 2AZ.

Detach oil lines from transmission oil cooler.

Replace O-rings.

Seal oil lines with suitable sealing plugs.

Catch and dispose of escaping transmission oil.

Fig. 85: Identifying Transmission Oil Cooler Mounting Bolt

Picture shows the right side, the procedure for the left side is identical.

Press together the retaining clips (1) on the left and right Remove transmission oil cooler towards front.

Fig. 86: Identifying Transmission Oil Cooler Mounting Clips

Only when replacing transmission oil cooler, modify holders on left and right.

Release screw (1).

Tightening torque 17 22 3AZ.

Remove holders on left and right.

Fig. 87: Identifying Transmission Oil Cooler Mounting Screws

NOTE: After completing work, check transmission oil level and top up transmission oil if necessary.

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