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 Chevrolet Uplander V6-3.9LFACTORY OEM SERVICE PROCEDURE
Timing Component Alignment Marks: Locations
Important: Always install a NEW camshaft position actuator filter anytime the camshaft position actuator is removed or installed.
^ Align the crankshaft timing mark (1) to the timing mark on the bottom of the timing chain tensioner (2).
^ Hold the camshaft sprocket with the timing chain hanging down and install the timing chain to the crankshaft gear.
^ Align the timing mark on the camshaft gear (4) with the timing mark on top of the timing chain tensioner (3).
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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