Tools Needed
- Standard socket set
- Standard wrenches
- Crankshaft socket
- Breaker bar
Parts and Materials
- New timing chain
- New timing cover (optional)
- Timing cover gasket
- Gasket sealer
- Oil pan gasket (optional)
Tip:
Before starting, check the clearance between the oil pan and the crossmember to ensure there’s enough room to remove the timing cover.
Performance Gains
A new timing chain and sprockets provide consistent performance and reliability. While this task involves many steps to access the timing chain, the cost savings compared to having a shop handle it can be significant.
Preparation
If the engine is already out of the car and on a stand, much of the hard work is done. However, if you’re working with the engine still in the car, the process can be more challenging but entirely manageable.
Steps for Timing Chain Removal
1. Access the Timing Cover
- Remove all accessories, braces, brackets, and hoses blocking access to the timing cover and chain.
- Fully drain the cooling system before removing the water pump, thermostat housing, or cooling lines.
- For extra clearance, consider removing the radiator.
2. Remove the Oil Pan
- Raise and support the car securely on jack stands.
- Drain the engine oil and remove the oil pan.
- If clearance is too tight to remove the oil pan completely, you may need to loosen the motor mounts and hoist the engine slightly. Alternatively, consider removing the engine entirely for easier access.
3. Remove the Timing Cover
- Remove the harmonic balancer using a removal tool.
- Loosen and remove the small bolts securing the timing cover to the engine block.
- Gently pry the timing cover off the block, as it may be stuck due to old gasket material.
4. Align the Timing Marks
- Using a crankshaft socket and breaker bar, rotate the engine in its normal direction until the timing marks on the upper and lower sprockets face each other. This ensures the No. 6 cylinder is at TDC (top dead center).
- To align the No. 1 cylinder at TDC, rotate the crankshaft one full revolution so the camshaft timing mark is at the top of the sprocket.
5. Remove the Timing Chain and Sprockets
- Remove the bolts attaching the upper sprocket to the camshaft.
- Slide the sprocket away from the camshaft to release the chain’s tension.
- Remove the chain and sprockets from the engine.
While You’re At It…
Consider replacing these components while the timing cover is off:
- Timing cover oil seal: Remove the old seal, clean the timing cover, and press in a new seal.
- Timing cover: Replace if it’s prone to leaks or has visible damage.
- Gaskets: Use new gaskets for a proper seal. One-piece rubber oil pan gaskets are highly recommended.
Installing the New Timing Chain
1. Align Timing Marks
- Position the crankshaft sprocket so its timing mark is at the top.
- Place the chain on the camshaft sprocket with its timing mark facing downward.
- Slip the chain under the crankshaft sprocket and align the sprockets so their marks face each other.
2. Secure the Sprockets
- Insert the upper sprocket bolts and tighten them to the manufacturer’s specifications.
3. Reassemble the Engine
- Clean the mating surfaces on the block and timing cover to remove all old gasket material.
- Apply gasket sealer to both sides of the new timing cover gasket and attach the cover.
- If the oil pan was removed, install a new gasket and secure the pan.
4. Refill Fluids
- Refill the engine oil and cooling system with fresh or clean fluids.
Final Tips
- Work carefully and methodically to avoid damaging components.
- Check the timing marks multiple times to ensure proper alignment.
- Tighten bolts to the correct torque specifications.