The Kies Crank Bolt Lock acts to "lock" the crank bolt on the N54 to prevent the crank bolt from backing out, which can lead to catastrophic engine failure. By locking the bolt into place, you virtually eliminate the possibility of the crank bolt working its way loose.

Please note by adding the Kies Crank Bolt Lock, it is still possible to spin a crank hub. However, it lessens the risk of the hub spinning because of a loose crank bolt. We highly encourage the use of this product in conjunction with a 4-pin crank hub upgrade.

With the Kies Crank Bolt Lock, we wanted to do something different than what's on the market today, and it was important to us that we had the product engineered and manufactured right here in the USA. 

First, we realized that there were situations where we needed to put a socket on the crank bolt to turn the engine by hand, so we built in a 32mm hex on the end of our billet 6061 aluminum crank bolt lock. By doing this, you don't need to remove the bolt lock to do other engine work! Next, we designed a single steel washer to lock the unit down instead of using 6-8 tiny washers. This ensures the best pressure distribution and ensures the easiest installation.