Engine - Connecting Rod Tightening Precaution

90toyota02
REFERENCE ENGINE
NUMBER 019
DATE 02-09-90
MODEL VV, VN, ST87,
ST8 5



TITLE PLASTIC REGION CONNECTING ROD BOLT TIGHTENING PROCEDURE

When tightening connecting rods on 2VZ-FE, 3VZ-E, or 5S-FE engines special attention needs to be paid to final tightening (final 90~ rotation) of the nut.

The bolt has a tendency to rotate slightly inside the rod when performing the final tightening. If not compensated for, this results in a lower final torque than specified. To achieve the correct torque use the following procedure. This procedure will insure that a full 900 degrees of nut rotation relative to the bolt is achieved during the final tightening:

1) Perform the initial torque as specified in the appropriate repair manual.
2) Place two marks ("B" and "C" in figure 1 below) on the end of connecting rod bolt 90~ apart. Place a third mark ("A" in figure 1 below) on the nut inline with mark "B" on the rod bolt.
3) Tighten the nut until mark "A" (on the nut) lines up with mark "C" (on the bolt).