Author: Peter

Replacing the timing chain on a BMW 320i E21 requires careful attention to detail and a good understanding of the engine’s mechanics. click here for more details on the download manual…..

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Here’s a detailed guide that outlines the necessary tools and steps for the replacement process.

### Tools and Equipment Needed

– **Socket Set**: Metric sockets (8mm to 19mm) for various bolts.
– **Torque Wrench**: Essential for ensuring bolts are tightened to the manufacturer’s specifications.
– **Ratchet and Extensions**: For accessing tight spaces.
– **Pliers**: For removing clips and hoses.
– **Screwdrivers**: Flathead and Phillips for various screws.
– **Timing Chain Tool Kit**: This typically includes:
– Timing chain tensioner tool
– Camshaft alignment tool
– Crankshaft locking tool
– **Engine Oil**: For lubrication during reassembly.
– **Gasket Set**: New gaskets for the timing cover and other components as needed.
– **Shop Manual or Repair Guide**: For torque specifications and procedures.
– **Oil Catch Pan**: To collect oil during the process.
– **Work Light**: To illuminate the workspace.
– **Cleaning Supplies**: Brake cleaner, rags, and a scraper for cleaning surfaces.

### Steps for Timing Chain Replacement

– **Preparation and Safety**:
– Disconnect the battery to prevent any electrical shorts or issues.
– Ensure the vehicle is on a level surface and secure it with wheel chocks.
– Lift the front of the vehicle using a jack and place on jack stands for better access.

– **Drain Engine Oil**:
– Place an oil catch pan underneath the oil pan.
– Remove the drain plug and allow the engine oil to completely drain out.

– **Remove Engine Components**:
– **Air Intake**: Remove the air intake duct and air filter housing to gain access to the engine.
– **Timing Cover**: Detach the timing cover by removing the bolts securing it. Carefully pry it off, taking care not to damage the gasket surface.
– **Accessory Components**: Remove any belts, pulleys, and accessories that obstruct access to the timing chain area.

– **Align Engine to Top Dead Center (TDC)**:
– Rotate the crankshaft using a socket on the crankshaft pulley until the timing mark aligns with the TDC mark on the timing cover.
– Use the crankshaft locking tool to ensure the crankshaft doesn’t move during the process.

– **Remove Old Timing Chain**:
– Detach the timing chain tensioner using appropriate tools.
– Remove the old timing chain from the camshaft and crankshaft sprockets.
– check the condition of the sprockets for wear; replace if necessary.

– **Install New Timing Chain**:
– Place the new timing chain on the crankshaft and camshaft sprockets, ensuring proper alignment with timing marks.
– Install the timing chain tensioner and adjust it according to specifications.

– **Reassemble Engine Components**:
– Reattach the timing cover with a new gasket, ensuring a proper seal.
– Reinstall all removed components, including pulleys, belts, and the air intake system.
– Refill the engine with new oil.

– **Reconnect Battery and Test**:
– Reconnect the battery and start the engine.
– Listen for any unusual noises, which could indicate issues with the timing chain installation.
– Allow the engine to warm up and check for leaks around the timing cover.

– **Final Checks**:
– After the engine runs smoothly, check the oil level and top off if necessary.
– Dispose of the old oil and any used parts responsibly.

### Conclusion

Replacing the timing chain on a BMW 320i E21 is a complex task that requires precision and patience. Ensure you have all the necessary tools and follow the steps meticulously to achieve a successful installation. If you’re uncertain about any part of the process, consulting a professional mechanic or referring to a detailed repair manual is recommended.
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