Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Jeep Commander 2WD V8-5.7LFACTORY OEM SERVICE PROCEDURE
System Specifications
GENERAL DESCRIPTION
CYLINDER BLOCK
PISTONS
PISTON PINS
PISTON RINGS
CONNECTING RODS
CRANKSHAFT
CYLINDER HEAD
MAIN BEARING CAP TORQUE AND SEQUENCE
NOTE: The main cap crossbolts are torqued after final torque of the main cap bolts. Always use a new washer/seal on crossbolts.
1. Clean and oil all cap bolts. Install all main bearing caps (1). Install all cap bolts and alternately tighten in two steps using the following sequence.
2. Step 1 - 27 Nm ( 20 ft. lbs.).
3. Step 2 - Turn main cap bolts an additional 90°.
4. Install the crossbolts with new washer/gasket. Starting with crossbolt A, tighten each crossbolt to 28 Nm ( 21 ft. lbs.).
5. Repeat crossbolt tightening procedure.
CRANKSHAFT MAIN BEARING SELECTION
The main bearings are "select fit" to achieve proper oil clearances. For main bearing selection, the crankshaft counterweight has grade identification marks stamped into it. These marks are read from left to right, corresponding with journal number 1, 2, 3, 4 and 5.
NOTE: Service main bearings are coded. These codes identify what size (grade) the bearing is.
HARMONIC BALANCER TORQUE
CAUTION: To prevent severe damage to the Crankshaft, Damper or Damper Installer 8512-A, thoroughly clean the damper bore and the crankshaft nose before installing Damper.
1. Slide damper onto crankshaft slightly.
CAUTION: Special Tool 8512-A, is assembled in a specific sequence. Failure to assemble this tool in this sequence can result in tool failure and severe damage to either the tool or the crankshaft.
2. Assemble Damper Installer 8512-A as follows, thread nut (2) onto the bolt (3) then install the roller bearing (1) followed by the hardened washer (5) slides onto the threaded rod (3). Once assembled coat the threaded rod's threads with Mopar(R) Nickel Anti-Seize (or equivalent).
3. Using Damper Installer 8512-A, press damper onto crankshaft.
4. Install then tighten crankshaft damper bolt to 176 Nm (129 ft. lbs.).
General Description:
CYLINDER BLOCK
Cylinder Block:
PISTONS
Pistons:
PISTON PINS
Piston Pins:
PISTON RINGS
Piston Rings:
CONNECTING RODS
Connecting Rods:
CRANKSHAFT
Crankshaft:
CYLINDER HEAD
Cylinder Head:
MAIN BEARING CAP TORQUE AND SEQUENCE
NOTE: The main cap crossbolts are torqued after final torque of the main cap bolts. Always use a new washer/seal on crossbolts.
1. Clean and oil all cap bolts. Install all main bearing caps (1). Install all cap bolts and alternately tighten in two steps using the following sequence.
2. Step 1 - 27 Nm ( 20 ft. lbs.).
3. Step 2 - Turn main cap bolts an additional 90°.
4. Install the crossbolts with new washer/gasket. Starting with crossbolt A, tighten each crossbolt to 28 Nm ( 21 ft. lbs.).
5. Repeat crossbolt tightening procedure.
CRANKSHAFT MAIN BEARING SELECTION
The main bearings are "select fit" to achieve proper oil clearances. For main bearing selection, the crankshaft counterweight has grade identification marks stamped into it. These marks are read from left to right, corresponding with journal number 1, 2, 3, 4 and 5.
NOTE: Service main bearings are coded. These codes identify what size (grade) the bearing is.
HARMONIC BALANCER TORQUE
CAUTION: To prevent severe damage to the Crankshaft, Damper or Damper Installer 8512-A, thoroughly clean the damper bore and the crankshaft nose before installing Damper.
1. Slide damper onto crankshaft slightly.
CAUTION: Special Tool 8512-A, is assembled in a specific sequence. Failure to assemble this tool in this sequence can result in tool failure and severe damage to either the tool or the crankshaft.
2. Assemble Damper Installer 8512-A as follows, thread nut (2) onto the bolt (3) then install the roller bearing (1) followed by the hardened washer (5) slides onto the threaded rod (3). Once assembled coat the threaded rod's threads with Mopar(R) Nickel Anti-Seize (or equivalent).
3. Using Damper Installer 8512-A, press damper onto crankshaft.
4. Install then tighten crankshaft damper bolt to 176 Nm (129 ft. lbs.).
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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