Advanced - 3
Pro - 4
2 - Moderate
1 - Easy
BMW S54 Dual Vanos Rebuild
INTRODUCTION
BMW’s Vanos variable valve timing system is one of the most recognized systems in the industry. There are a number of different designs, and they all
work off of ingeniously simple mechanical principals. Their notoriety, however, is not likely to be from their design and performance, but more so from
the fact that they frequently wear out. Today we’re going to be working on the dual Vanos unit that is found in the 6 cylinder S54 engines. The most
common Vanos problem is worn out seals. We’ll be replacing them all, and In the case of the S54 Vanos, there are a few other well known issues that we
will also be dealing with. The oil pump drive tabs on the Vanos exhaust hubs are known to break. The problem is caused by improperly sized holes in
the oil pump rotor, and we’ll show you how to replace it. Another common problem, known as Vanos “rattle”, is one we will take care of by repairing the
Vanos transfer gear sets and replacing the diaphragm springs behind the Vanos hub. To finish things off we’ll also replace the Vanos hub bolts and cam
sprocket hub bolts - which are known to loosen over time, and the upper timing chain guide as well. Rebuilding the S54 dual Vanos is time consuming
due to a lot of steps, but overall it’s not too difficult of a job. The best part is that it’ll restore smooth, consistent performance, some of which you may
not even realize you’ve lost.
An experienced technician can complete the job in a day, however if this is the first time you’ve done
one or if you’re light on experience, it’s best to plan a couple days - a perfect weekend project. There
are a number of steps that require precision and patience, and this is not something you want to rush
through. The best advice, as always, is to read through these instructions first to familiarize yourself with
the project and make sure you have all of the required tools on hand.
Thank you for looking to ECS Tuning for all your performance and repair needs.
We appreciate your business!
While you’re in the middle of this, there are a few jobs that you’ll have the perfect opportunity to
do. Take a look at the list below and consider these before you start. It’ll save you a lot of time
down the road!
• Valve cover gasket replacement
• Spark plug replacement
• Valve adjustment
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