cylinder

Extracting what’s left of a sheared-off bolt from inside a cylinder head is seldom an easy task. In fact, it often requires removing the head from the engine and tapping out the old bolt to finish most jobs. And when that sheared bolt happens to secure a critical piece of engine hardware, there’s simply no ignoring it. The timing chain guide bolt-on General Motors’ popular Ecotec four-cylinder engines is one such piece of critical hardware and one that routinely fatigues and breaks off during normal use. The unmistakable rattle of a loose timing chain confirms the guide has inevitably broken […]