DIY Guide: Replacing Engine and Transmission Mounts on a BMW E39 528i
How to Replace Engine and Transmission Mounts on a BMW E39 528i
Replacing the engine and transmission mounts is essential preventative maintenance that restores factory shift feel and eliminates drivetrain vibrations.
The Short Answer (TL;DR)
This DIY covers replacing the fluid-filled engine mounts and rubber transmission mounts on a 1998 BMW E39 528i. Expect to spend 2-3 hours using basic hand tools, a floor jack, and jack stands. Upgrading your exhaust or intake while under the car is a smart way to maximize your garage time.
The DIY Process Overview
To tackle this job, safely support the vehicle on jack stands and use a floor jack with a block of wood to slightly lift the engine by the oil pan. Unbolt the top and bottom nuts on the engine mounts, then carefully hoist the engine just enough to slide the old mounts out. The factory fluid-filled mounts typically collapse over time—often shrinking by 5mm or more—even if they are not leaking yet.
The transmission mounts follow a similar process. Support the transmission with your jack, remove the lower crossmember bracket, swap the rubber mounts, and torque everything to factory specifications.
Why You Should Upgrade While You're In There
Since you already have the car in the air and are working around the lower engine bay and exhaust pathway, this is the perfect time to optimize your M52 engine's airflow. Unbolting the crossmember and stabilizing the drivetrain makes installing aftermarket exhaust components significantly easier.
Recommended Upgrade: A free-flowing exhaust system or an engine tune to maximize throttle response now that the engine is properly secured.
Frequently Asked Questions
Is it difficult to replace the engine mounts on an E39?
It is a straightforward driveway job for anyone with basic mechanical skills. The most critical step is ensuring you lift the engine slowly and evenly to avoid damaging coolant hoses, the radiator shroud, or engine wiring harnesses.
How do I know if my BMW engine mounts are bad?
Look for visible fluid leaks from the mounts, excessive engine movement under load, or a noticeably shorter mount height compared to a new part. Shifter movement during hard acceleration is also a classic symptom of worn transmission mounts.
