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.
2007 Jeep Wrangler V6-3.8LFACTORY OEM SERVICE PROCEDURE
Timing Component Alignment Marks: Locations
INSTALLATION - TIMING CHAIN AND CAMSHAFT SPROCKET
1. Rotate crankshaft so the timing arrow is to the 12 o'clock position (4).
NOTE: Lubricate timing chain and sprockets with clean engine oil before installation.
2. While holding camshaft sprocket and chain in hand, place timing chain around the sprocket, aligning the plated link (2) with the dot on the sprocket. Position the timing arrow to the 6 o'clock position.
3. Place timing chain around crankshaft sprocket with the plated link (2) lined up with the dot on the sprocket. Install camshaft sprocket into position.
4. Use a straight edge to check alignment of timing marks.
5. Install camshaft sprocket bolt and washer. Tighten bolt to 54 Nm (40 ft. lbs.).
6. Rotate crankshaft 2 revolutions and check timing mark alignment. If timing marks do not line up, remove camshaft sprocket and realign.
7. Install the timing chain cover.
8. Connect negative cable to battery.
Factory Service Tools
Use the Manual With the Right Hardware
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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.