Here's a general outline of the process. Specific steps might vary slightly depending on your exact Bronco II model and any modifications. Always consult a repair manual specific to your vehicle's year and model for detailed instructions and torque specifications.
1. Preparation:
* Safety First: Disconnect the negative battery cable.
* Gather Tools: You'll need a variety of tools, including sockets, wrenches (metric), a harmonic balancer puller, a crankshaft seal installer/remover (crucial!), a pry bar, a sealant scraper, rags, a torque wrench, and possibly a new timing chain cover gasket (often damaged during removal). Consult your repair manual for the specific socket and wrench sizes.
* Drain the Oil: Completely drain the engine oil.
* Disconnect Components: Disconnect the following (order may vary based on your setup):
* Radiator hoses (top and bottom).
* Alternator.
* Power steering pump (if applicable).
* Air conditioning compressor (if applicable).
* Fan and shroud. This often requires removing the fan clutch.
* Various brackets and hoses.
* The distributor.
* Timing chain cover (this is usually the most significant step; you may need to remove the timing chain cover to access the oil seal).
2. Remove the Harmonic Balancer:
* Use a harmonic balancer puller to remove the harmonic balancer. This tool is essential; attempting removal without it risks damaging the crankshaft.
3. Remove the Old Oil Seal:
* Once the timing cover is off (if needed), you'll have access to the front crankshaft.
* Use a crankshaft seal installer/remover tool to carefully remove the old oil seal. This tool prevents damaging the crankshaft. Pry bars should be avoided if possible.
4. Install the New Oil Seal:
* Clean the crankshaft sealing surface thoroughly. Remove any old sealant residue.
* Use the seal installer tool to carefully install the new oil seal, ensuring it's seated correctly and evenly. Do not hammer it in.
5. Reassembly:
* Reinstall all components in reverse order of removal. Pay close attention to the order and torque specifications for all bolts. This is crucial to prevent leaks and damage.
* Use new gaskets where necessary, especially the timing chain cover gasket.
* Replace the harmonic balancer, ensuring it's properly torqued.
* Refill the engine with the correct amount and type of oil.
* Check for leaks after running the engine.
Important Considerations:
* Timing Chain: If you remove the timing chain cover, you'll likely need to carefully note the timing chain's position to ensure proper reinstallation. Incorrect timing can cause serious engine damage. Consult a repair manual for this step.
* Torque Specifications: Use a torque wrench and adhere to the manufacturer's torque specifications for all bolts.
* Sealant: Use a high-quality sealant as needed on gaskets.
* Repair Manual: A factory service manual for your specific 1988 Ford Bronco II with the 2.9L V6 is invaluable. It will provide detailed diagrams, torque specs, and specific removal/installation procedures.
This is a complex procedure. Again, if you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. Improper repair can lead to significant engine damage.
