PSI (Power Solutions Intl) — 2) Remove fixing bolts

A PSI (Power Solutions Intl) service procedure — check it applies to your exact model before use.

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Procedure

1. 3) Remove oil pan
2. 4) Remove plugs and connectors
3. 2.8.3. Steps to assemble oil pan
4. Reverse disassembly procedure to assemble oil pan.
5. 2.8.4. Oil pan inspection and repair
6. Key point 1
7. Before the disassembling, all engine oil should be drained out. Put an engine oil container
8. under drain screw plug of oil sump, screw off the plug with a plug wrench to drain oil out.
9. Key point 2:
10. Assembling
11. 1) Apply sealant on fitting surface of engine block and partially apply sealant on oil
12. sump, place sealing gasket on the fitting surface.
13. 2) Lift and place oil sump, be careful and avoid crashing the fitting surface.
14. 3) Install bolts and gaskets and tighten the bolts with pneumatic impact wrench to 20~35.5Nm.
15. 33
16. 2.9 Cylinder head assembly and disassembly
17. 2.9.1. Exploded view of cylinder head
18. Figure 17
19. 2.9.2. Steps to disassemble cylinder head
20. 1) Loosen the cylinder head bolts and remove them.

Source: manual:4.5L-Engine-Service-Manual-7610033-2.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.