Here are the torque specifications for the 3.6L Pentastar V6 water pump on Jeep JK Wranglers (model years typically 2012-2018):
Water Pump to Engine Block Bolts
- M6 Bolts (Short, approximately 35mm long): 105 in-lbs (9 Nm).
- M6 Bolts (Long, approximately 85mm long): 105 in-lbs (9 Nm).
- Torque Pattern: Gradually tighten all bolts in a criss-cross pattern following the sequence recommended in the service manual.
- Notes: Clean bolt holes and threads thoroughly. Apply thread locker (e.g., Mopar Thread Lock or equivalent medium-strength Loctite) to the threads before installation if specified. Use a new gasket or RTV sealant per the repair procedure.
Water Pump Pulley Bolts
- Bolt Torque: 105 in-lbs (9 Nm).
- Note: Ensure the pulley sits flush and even. Tighten bolts gradually and evenly in a star pattern.
Serpentine Belt Idler Pulley Bracket Bolts (if removed)
- Bolt Torque: 250 in-lbs (28 Nm).
Important General Guidelines
- Calibrated Torque Wrench: Always use a properly calibrated torque wrench for accuracy.
- Clean Threads: Ensure bolt holes and threads are clean and free of debris or old sealant.
- Thread Locker: Apply the correct thread locker to applicable bolts unless the bolt comes pre-coated.
- Sealing Surfaces: Mating surfaces on the block and water pump must be perfectly clean, dry, and free of old gasket material.
- Gasket/Sealant: Use only the specified gasket or RTV sealant per the factory service procedure. Install correctly.
- Coolant: Refill the cooling system with the correct type of coolant (OAT HOAT) after the installation is complete and cured (if RTV used). Bleed the system thoroughly according to procedure.