Place the Z4 in park and turn the engine off. Allow it to cool for a half hour.
Open the trunk. Pull up the removable carpet and flooring. You will now have access to the battery, on the right side seated in a bracket.
3
Remove the bracket with a screwdriver. There are a total of three screws, two on the bracket and one securing it.
Remove the positive cable from the battery using a socket. Place the cable to the side. Remove the negative cable in the same manner. Pull the wall out.
Lift the battery out of the vehicle. Batteries can weigh up to 70 pounds, so get some help.
Place the replacement into the bracket. Replace the three screws to secure the bracket to the battery. Connect the positive battery cable and tighten it. Repeat the same process for the negative
Before servicing the vehicle, refer to the Precautions Section.
Disconnect the battery ground (negative) cable from the battery.
Raise and support the vehicle.
Remove the radiator air baffle.
Remove the starter motor BAT terminal nut and electrical leads.
Remove the starter motor bolts.
Remove the starter motor.
Starter motor mounting-3.6L engine
To install:
Install the starter motor.
NOTE
Use the correct fastener in the correct location.
Install the starter motor bolts. Tighten the starter motor bolts to 37 ft. lbs (50 Nm).
Install the starter motor S terminal electrical connector.
Install the battery positive cable and the BAT terminal nut to the starter motor BAT terminal. Tighten the starter motor BAT terminal nut to 115 inch lbs. (13 Nm).
Install radiator air baffle assembly.
Lower the vehicle.
Install the battery ground (negative) cable to the battery.
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