Hyundai Sonata Powertrain, Subframe & Suspension Removal - Part II

Project Justification and Car Condition

• 💡 The 2012 Hyundai Sonata was acquired for free, making the investment in a replacement powertrain worthwhile, especially for a teenage driver.
• ✨ The car is a rust-free southern vehicle (North Carolina), a significant advantage over cars from rust-belt regions.
• 🚗 Despite being free, the car requires new tires, brakes, and a complete powertrain due to engine failure.
• 💰 The owner's philosophy is to have children pay for their own vehicles and insurance to foster responsibility.

Powertrain and Suspension Removal Process

• 🛠️ The video details the removal of the complete powertrain, subframe, and front suspension from the Sonata.
• 🔩 The process involves unhooking various components including exhaust, coolant lines, transmission cooler lines, brakes, and wheel hubs.
• 💨 Rust-free components in the south make disassembly easier, with bolts often coming apart without significant struggle or heat.
• ⚠️ Challenges arise with seized components, requiring persuasion and sometimes heat, though less frequently than in rust-belt cars.

Component Inspection and Preparation

• 🔍 The transmission fluid showed significant metal particulate on the drain plug, indicating internal wear.
• 🧊 The engine sounded good when cold but developed issues when fully warmed up, a common sign of internal problems.
• 💨 AC system components were inspected, with evidence of leaks and corroded connections, suggesting potential issues with the compressor or evaporator.
• ⚙️ The engine harness was carefully unhooked, with a focus on identifying bulkhead connectors for easier removal.

Harness and Component Management

• 📦 The engine computer (PCM) was removed to gain access to the wiring harness connectors.
• 🔌 The wiring harness was unbolted and bagged to protect connectors from dirt and debris during removal and reinstallation.
• ⛽ Fuel lines were saved for last to minimize the risk of sparks or fire during disassembly.
• 🔩 The shifter cable and heater hoses were unhooked, and the transmission mount was disconnected.

Subframe and Powertrain Extraction

• ⚖️ The subframe bolts were removed, and the engine mount was detached, preparing for the powertrain's descent.
• ⚠️ A Harbor Freight lifting table with a 1,000 lb capacity was used, requiring careful monitoring to prevent pinching or damage.
• 🔧 The engine mount on the passenger side and the transmission mount were disconnected.
• ✅ The powertrain and subframe assembly were successfully lowered and removed from the vehicle, marking the end of Part II.

Next Steps and Future Considerations

• 🚗 The replacement engine has a VIN and a tag indicating low mileage (49k) and good running condition.
• 🧐 A comparison of wiring harness part numbers between the original and replacement engines was performed, with a decision to use the harness from the replacement engine despite a minor part number difference.
• 🔧 The catalytic converter needs to be removed from the old engine and transferred to the new one.
• 🚧 The O2 sensor socket required modification (grinding) to fit the specific sensor.
• 🤔 The possibility of separating the subframe from the engine for easier removal was considered but ultimately not pursued in this part.