Rocker Cover Bolt Breakage
Symptoms
A rocker cover bolt snaps during routine maintenance, leaving the threaded portion stuck in the head.
Cause
The bolts are small and the aluminium head threads are soft. Over-torquing or corrosion causes the bolt to shear. Rocker cover bolt torque is 17 Nm, surprisingly light.
Fix
Use a screw extractor (easy-out) to remove the broken bolt.
If the threads are damaged, a helicoil repair is necessary.
Take extreme care during removal, if the broken bolt is forced and the thread strips, the head requires professional repair.
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