Porsche 968 Restoration: Major Preventative Maintenance and AC Repair

Initial Diagnosis and Scope

• 💡 The Porsche 968 was purchased in upstate New York with the intention of driving it back to Arizona, but an AC compressor seizure led to a snapped accessory belt, disabling the alternator and requiring the car to be transported home.
• 🎯 Upon return, research revealed the need for extensive preventative maintenance beyond the immediate AC and belt repair to ensure long-term reliability.
• 🔑 The video focuses on a comprehensive service, including timing belt, water pump, and other critical components, applicable to both the 968 and 944 models.

Expert Collaboration and Key Components

• 🤝 Ryan from The Transaxle Shop, an expert in Porsche transaxle models, was brought in to assist with the complex service.
• 🛠️ The major service includes replacing the timing belt, balance shaft belt, and water pump, crucial for the 968's interference engine design where valve-to-piston contact can cause catastrophic failure.
• ⚠️ Other critical replacements include cam chain pads, thermostat, fuel lines (to prevent fire hazards), and rollers/idler pulleys.

Timing Belt and Water Pump Service Details

• ⚙️ The process involves setting the engine to top dead center (TDC) by aligning specific marks on the cam gears and sprockets, using specialized tools like a flywheel lock.
• 💧 Draining the coolant is a messy but necessary step before removing the water pump, which revealed significant rust and a snapped bolt, requiring heat application for removal.
• 📅 The existing water pump thermostat was dated March 2016, indicating it was due for replacement despite not being as old as initially suspected.

Addressing Engine Leaks and Wear

• 🔍 Inspection of the valve cover revealed oil leakage around the spark plug wells, suspected to be caused by worn seals and improper gasket application.
• ❌ The cam chain and pads were inspected, but due to time constraints, the decision was made to defer replacement of the cam chain, focusing instead on the timing belt and water pump.
• ✅ New valve cover gaskets and seals were installed to address the oil leaks.

Reassembly and Final Fixes

• 🚀 The engine bay was reassembled with new components, including the thermostat, timing belt, water pump, and fuel lines.
• 💨 The seized AC compressor was replaced with a new unit, followed by the accessory belt and alternator power restoration.
• 🔧 The car required a final oil change with 20W50 oil, coolant refill, and a crucial fix for the starter motor's loose ground strap and hot cable, which prevented the engine from cranking.
• ✅ Upon resolving the starter issue, the Porsche 968 was successfully brought back to life, running and driving.