OEM 2002 Chevrolet Trailblazer Timing Cover

2002 Chevrolet Trailblazer Timing Cover Parts and Q&A

• Q: How to replace the engine front timing cover on 2002 Chevrolet Trailblazer?

  A: Engine front cover replacement requires draining the engine coolant first followed by the removal of cooling fan and shroud then drivebelt and Water Pump and crankshaft balancer and Power Steering Pump. First raise the vehicle before removing the Oil Pan and then lower it. Liberate the 7 mm central bolt from its opening while proceeding to loosen the surrounding engine front cover screws. The cover alignment pins (J 44219) help you separate the engine front cover by inserting two front cover bolts through the front cover jack screw holes while you tighten them until they release the front cover. First clean and inspect the front cover before removing its two bolts and the Oil Pump's bolts. Use gm p/n 12378521 sealer to create a 3 mm (0.12 inch) bead that goes along the back side trace grooves of the engine front cover as well as the inside three bolt hole bosses. Mount the Oil Pump onto crankshaft sprocket splines before installing the front cover which needs tightness at 10 nm (89 inch lbs.) for the center bolt to be tightened last. Put the vehicle back on its stand after removing the cover alignment pins (J 44219), raise the vehicle again and mount the Oil Pan, then lower the vehicle for completion. The Power Steering Pump, crankshaft balancer and Water Pump must be installed with the drivebelt and cooling fan and shroud before filling the engine with coolant.