Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2004 Lexus LX 470FACTORY OEM SERVICE PROCEDURE

Cylinder Block: Reassembly

HINT:

Thoroughly clean all parts to be assembled.
Before installing the parts, apply new engine oil to all sliding and rotating surfaces.
Replace all gaskets, O-rings and oil seals with new parts.

ASSEMBLE PISTON AND CONNECTING ROD
1. Using a small screwdriver, install a new snap ring on one side of the piston pin hole.
  
  Fig 1: Installing Snap Ring On Piston Pin Hole
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Gradually heat the piston to about 60°C (140°F).
  
  Fig 2: Heating Piston
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Coat the piston pin with engine oil.
4. Position the piston front mark to the outside mark on the connecting rod as shown in Fig 3 .
  
  Fig 3: Identifying Piston Components
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.