Which BMW Engines Are Most Prone to Timing Chain Failure?
Photo by p - on Unsplash If you’ve spent any time researching used BMWs, you’ve almost certainly come across warnings about timing chains. It’s one of those topics that can make even straightforward buying decisions feel complicated. But not all BMW engines have the same risk, and some of the most-searched engines, like the B48, the B58, and the BMW B47 engines, are significantly more reliable in this area than the engines that gave BMW the reputation in the first place. This guide ranks the most commonly discussed BMW engines from worst to best when it comes to timing chain risk. What Is a Timing Chain and Why Does It Matter? The timing chain is a metal chain inside the engine that links the BMW crankshaft (which is turned by the pistons) to the camshafts (which open and close the valves). Everything has to happen in a precise sequence. If the chain stretches, slips, or snaps, that sequence breaks down. On most BMW engines, this is an interference engine, which means the...
