90–95 N⋅m (66–70 lbf⋅ft) at 4,000–4,100 rpm
Ensure the VVT-i actuator and camshaft timing marks are aligned correctly before reassembling the top cover. Sealant Application: When reinstalling the valve cover
The 1SZ-FE uses a on the intake camshaft only. 1szfe engine manual top
Follow star sequence from the center outward. Use new bolts. 9.5 ft-lbs Tighten in multiple passes from the center caps outward. VVT-i Actuator (Intake) Hold the camshaft hexagon portion with a wrench. Exhaust Camshaft Gear Hold the camshaft hexagon portion with a wrench. Cylinder Head Cover Avoid overtightening to prevent perimeter gasket leaks. Timing Chain Tensioner Apply thin bead of sealant to the sealing surface. Cylinder Head Installation Steps
Note: Use factory service manual torque specs, clearances, and sequences for your specific year/model. 90–95 N⋅m (66–70 lbf⋅ft) at 4,000–4,100 rpm Ensure
Verify that the timing marks on both the intake VVT-i actuator sprocket and the exhaust camshaft sprocket point upward and align with the corresponding colored or marked links on the timing chain. Camshaft Timing Marks Alignment
A: It is recommended to stick to 5W-30 as specified in the 1SZ-FE engine manual. Thicker oils can take even longer to reach the hydraulic tensioner at startup, increasing the risk of chain failure. Use new bolts
Before disassembly, perform the following:
The exhaust camshaft gear features a corresponding alignment mark that aligns with the second bright/colored link.
