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Resolve 8HP51 Automatic Transmission Noise Issues | BMW Maintenance

10/20/2023

Resolve 8HP51 Automatic Transmission Noise Issues | BMW Maintenance

Are you the proud owner of a BMW equipped with the 8HP51 automatic transmission and rear-wheel drive? While this transmission offers a smooth ride, you might have noticed an unsettling cracking or metallic noise emanating from the vehicle's underbody. Fear not! In this guide, we'll delve into the root of the problem and provide you with the expert solution to silence those bothersome noises.

What Causes the Noise?
The eerie noises typically occur in two scenarios:

While driving, when the load changes from overrun to traction operation, or vice versa, or from traction operation to overrun operation.
When stationary, during the gear shift from Drive (D) to Reverse (R), or vice versa, or from Reverse (R) to Drive (D).

The cause of these disconcerting sounds lies in the unfavorable setting behavior of the screw connection known as the "output flange on automatic transmission."

The Solution: Replace the Collar Nut
To resolve this issue and enjoy a noise-free ride, you'll need to replace the collar nut. Follow these steps:
Step 1: Procure a new collar nut. The BMW part number you need is 24 20 7588761. The part name is "collar nut (M27X1.5)."
Step 2: Install the collar nut with a tightening torque of 60 Nm. For added security, secure the nut with an 8 mm mandrel by caulking.
The beauty of this solution is that it doesn't require dismantling the output flange, making it a relatively straightforward fix.

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In conclusion, by replacing the collar nut as described, you can bid farewell to the unsettling noises coming from your BMW's automatic transmission. Don't let these sounds disrupt your driving experience; follow our expert advice and consider joining our BMW Programming & Retrofit Course for a comprehensive understanding of BMW maintenance and repair.

This article is your key to a quieter and more enjoyable BMW ride.

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