Tech Tip: Subaru A/T Stud Leak Repair – UnderhoodService

Tech Tip: Subaru A/T Stud Leak Repair

While diagnosing a transmission leak on a model with Phase II 4EAT, it's advisable to inspect the left-side transmission stud area. If the transmission leak originates from this stud, perform the following repair.

While diagnosing a transmission leak on a model with Phase II 4EAT, it’s advisable to inspect the left-side transmission stud area. If the transmission leak originates from this stud, perform the following repair.

Service Procedure:
1. Remove the left front tire.
2. Separate the left-hand stabilizer link from the lower control arm (also referred to as transverse link).
3. Separate the left front ball joint from the lower control arm.
4. Remove the axle shaft pin.
5. Remove the axle shaft from stub shaft and place out of the way.
6. Remove the transmission stud nut from the stud.
7. Remove the transmission stud.

Note: Regardless of the method used to retract the stud from the main case, be sure to inspect the stud for damage and replace if necessary.

8. Wrap the stud (whether it’s old or new) with Teflon tape.
9. Reinstall the stud and tighten the stud to 13 ft.-lbs.
10. Reinstall the stud nut and torque to 30 ft.-lbs.
11. Reinstall the axle shaft, pin, swaybar link, ball joint and tire in reverse order.

Note: Axle shaft pins cannot be used again. Install a new axle shaft pin during reassembly.

Technical service bulletin courtesy of ALLDATA.

For additional information, visit www.alldata.com.

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To see inductance inside the primary windings, use an amp probe placed around the positive wire for the ignition coil.

Kilovolts or kV is the unit used to measure the output of an ignition coil. Some coils can output 20kV to 40 kV. So, how does an ignition coil turn system or battery voltage into these huge voltages? The answer is inductance. 

The ECM provides the voltage to the primary coil winding. The primary winding might have 100 turns around the coil’s core or plates. When the voltage to the coil is turned off, a magnetic field collapses. The collapsing field will generate more than 100 volts thanks to inductance. The energy is transformed by the windings in the secondary with inductance again, but thanks to the 10,000 windings, the voltage is boosted to 40kV at the spark plug’s electrodes. The best way to see inductance inside the primary windings is to use an amp probe placed around the positive wire for the ignition coil. With this setup, you can see the current ramping in the coil and the collapse of the magnetic field. 

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