Toyota FJ GSJ10 Technical Manual page 33

EG-10
5. Piston
" The pistons are made of aluminum alloy.
" The piston head portion uses a taper squish shape to accomplish fuel combustion efficiency.
" The piston skirt is coated with resin to reduce friction losses.
" The groove of the top ring is coated with anodic oxide to improve wear resistance and corrosion resistance.
" This piston is common to all cylinders. Therefore, the pistons are not shaped especially for the right or the
left bank. As a result, serviceability has been improved.
" By increasing the machining precision of the cylinder bore diameter, only one size piston is required.
Front Mark
6. Connecting Rod and Connecting Rod Bearing
" Connecting rods that are forged for high strength are used for weight reduction.
" Knock pins are used at the mating surfaces of the bearing caps of the connecting rod to minimize the
shifting of the bearing caps during assembly.
" Plastic region tightening bolts are used.
" Aluminum bearings are used for the connecting rod bearings.
" The lining surface of the connecting rod bearing is micro-grooved to realize an optimal amount of oil
clearance. As a result, cold-engine cranking performance is improved and engine vibration is reduced.
Plastic Region
Tightening Bolt
ENGINE — 1GR-FE ENGINE
Resin Coating
Knock Pin
Taper Squish Shapes
Micro-grooved
238EG14
0240EG39C