To ensure proper engine sealing and prevent costly errors like head gasket failure on the 2016 Chevrolet Malibu 1.5L Ecotec engine, adhere strictly to the factory torque-to-yield specifications for head bolts. Never reuse old bolts; always install new ones to maintain integrity.
Torque Specifications and Sequence
Follow this step-by-step procedure for accuracy:
- Step 1: Lubricate bolts with clean engine oil and tighten all bolts in sequence to an initial torque of 25 Nm (18 lb-ft).
- Step 2: Tighten all bolts an additional 90 degrees rotation in the same sequence.
- Step 3: Tighten all bolts a final 90 degrees rotation to achieve the correct torque-to-yield stretch.
Critical Sequence Diagram
Tighten bolts in numerical order as per GM's sequence:
- Starts from the center bolts and moves outward: 8-6-4-2-1-3-5-7-10-9-11.
Essential Tips to Avoid Mistakes
Cleanliness is key: Ensure threads and mating surfaces are debris-free. Use calibrated tools: Only rely on a digital torque wrench. Avoid shortcuts: Skipping steps can cause warping or leaks, necessitating engine rebuilds.