LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 1995 >> SC 300 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (4.0L V8) >> Overhaul >> Cylinder Block Assembly >> Piston & Rod Assembly

Piston & Rod Assembly

WARNING: This page is about a different car, the 1996 Lexus SC 400 and 1995 Lexus SC 400. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure connecting rod and connecting rod cap are marked with matching cylinder number for reassembly reference. Note that piston must be installed with front mark positioned in relation to outside mark on connecting rod. See Fig 1.
    NOTE: Right piston contains 2 cavities for front mark, and left piston contains one cavity for front mark. Reference to right and left indicates sides as viewed from rear of engine (drive plate end).
  2. When removing piston from connecting rod, remove snap rings from piston. Heat piston to 140°F (60°C) in water. Remove piston pin. Separate piston from connecting rod.
  3. Using caliper, measure connecting rod bolt outside diameter at area just above threads. Replace connecting rod bolt if outside diameter is less than .2756" (7.000 mm).
  4. Ensure piston pin diameter is within specification. See PISTONS, PINS & RINGS  under ENGINE SPECIFICATIONS.
    NOTE: Crankpin bore diameter is identified by size mark ("1", "2", "3" or "4") stamped on connecting rod cap. See Figure.
  5. Ensure connecting rod pin bushing bore diameter, crankpin bore diameter, bend and twist are within specification. See CONNECTING RODS  under ENGINE SPECIFICATIONS.
  6. Bushing in connecting rod can be replaced if bore diameter is not within specification. Ensure bushing oil hole aligns with connecting rod oil hole. Bushing must be honed to obtain correct piston pin-to-rod clearance.
    NOTE: With piston at 140°F (60°C), piston pin should slide into piston using thumb pressure. Replace piston if piston pin can be installed in piston with piston at room temperature.
  7. To reassemble, install NEW snap ring in piston. Install piston on connecting rod so front mark on top of piston aligns with outside mark on connecting rod. See Fig 1. Heat piston to 140°F (60°C) in water. Coat piston pin with engine oil. Install piston pin and remaining NEW snap ring.
CAUTION: Installation direction of piston on connecting rod is different for left and right sides. Pistons have an "R" or "L" index mark to indicate installation position on connecting rods. See Fig 1. Reference to right and left indicates sides as viewed from rear of engine (drive plate end).
Fig 1: Assembling Pistons & Connecting Rods
G93I01800Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals