Infiniti Engine >> MAIN BEARING BOLT REMOVEL AND INSTALLATION PROCEDURES
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Infiniti Engine >> MAIN BEARING BOLT REMOVEL AND INSTALLATION PROCEDURES
Main Bolt Torque & Tightening Sequence On
1990-96 Infiniti 4.5L VIN N Engines
The AERA Technical Committee offers the following information regarding the main bolt torque and tightening sequence on 1990-96 Infiniti 4.5L VIN N engines. The correct procedures to remove and install the main bearing caps are critical for this engine. If the proper sequence and torque during installation is not followed, engine damage may result.
To correctly remove the main bearing cap bolts, loosen them in the sequence shown below in Figure 1. Do not use an air wrench in this procedure as it may
pull bolt hole threads during the process.
To correctly tighten the main bearing cap bolts refer to the procedure and sequence shown in Figure 2.
Step 1. Tighten nuts numbered 1, 2 & 5-10 to 32-36 ft.lbs (43-49 N.m)
Step 2. Tighten nuts numbered 3, 4 & to 30-34 ft.lbs (41-46 N.m)
Step 3. Tighten nuts numbered 11 through 20 to 14-18 ft.lbs (19-24 N.m)
Step 4. Tighten nuts numbered 1, 2 & 5-10 to 81-85 ft.lbs (110-115 N.m)
Step 5. Tighten nuts numbered 3 & 4 to 80-84 ft.lbs (109-114 N.m)
Step 6. Tighten nuts numbered 11 through 20 to 30-34 ft.lbs (41-46 N.m)
Step 7. Tighten nuts numbered 21 through 30 to 34-38 ft.lbs (46-52 N.m)
The AERA Technical Committee
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