Toyota Engine >> CONNECTING ROD NUT TIGHTENING CAUTION
Toyota Engine >> CONNECTING ROD NUT TIGHTENING CAUTION
Connecting Rod Nut Tightening Caution On
Toyota 2.5 & 3.0L Engines
AERA machine shops should be particularly cautious when tightening the connecting rod nuts on Toyota 2.5 & 3.0L V-6 engines used in the 4 Runner and Pickup.
The connecting rod nuts for these engines use a combination torque, then turn method to achieve the proper clamping load. First the nut is torqued to 18 lbs.ft., then turned an additional 90°. It is possible for the rod bolt to slightly turn inside the connecting rod during this process, causing the final torque to be below specifications. The nut must be turned 90° relative to the bolt, not the connecting rod.
During assembly, instead of marking the nut and the connecting rod with a paint stick, mark the nut and the bolt to ensure that the proper final torque is achieved.
The AERA Technical Committee
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