Engine Block Valley Cover Removal for Chevrolet Chevrolet W-Series Commercial W4 (W3500/W4500) 2006
- Remove the knock sensor wire harness.
- Remove the knock sensors.
- Remove the valley cover
bolts.
- Remove the valley cover and gasket.
- Discard the valley cover gasket.
- Remove the knock sensor oil seals (520) from the cover (555).