Mercury - Distributor Cap Ignition System Component PBT/PET Composite 898253T23. Overview. When your ignition system is healthy, you can feel it the moment your MerCruiser 4.3L fires up that clean, confident start and the smooth rumble that follows. A good distributor cap may not get much attention, but it plays a huge role in that dependable feeling. The Quicksilver 898253T23 Distributor Cap keeps your spark steady and your engine running the way it was meant to. Whether you're backing away fro