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How many special tools do you have to buy rebuild a 1980 300 d engine?

It's impossible to give you a specific number of special tools needed for a 1980 300D engine rebuild without knowing the exact scope of the rebuild.

However, I can give you some general advice and tools you might need:

General Tools:

* Basic Hand Tools: Wrenches, sockets, screwdrivers, pliers, etc.

* Torque Wrench: Essential for proper tightening of engine components.

* Breaker Bar: To break stubborn bolts loose.

* Engine Hoist: For lifting and supporting the engine during removal and installation.

* Engine Stand: To support the engine safely during disassembly and reassembly.

* Dial Gauge: To measure engine clearances and ensure proper alignment.

Special Tools (Potentially needed depending on the rebuild):

* Crankshaft Bearing Race Installer/Remover: For installing and removing the main bearings.

* Camshaft Bearing Race Installer/Remover: For installing and removing the camshaft bearings.

* Valve Spring Compressor: To compress the valve springs for valve removal and installation.

* Flywheel Holder: To prevent the flywheel from turning while removing or tightening the crankshaft bolts.

* Timing Tools: For setting the valve timing correctly. These can vary depending on the engine.

* Injection Pump Timing Tools: Specific to the diesel injection system.

* Oil Pan Removal Tools: For removing the oil pan.

Tips:

* Consult a Workshop Manual: A good workshop manual for your specific engine will provide detailed instructions and specify required tools.

* Contact a Specialist: Consider contacting a specialized Mercedes-Benz repair shop or a diesel engine mechanic for advice on tools and the rebuild process.

* Rent Tools: If you only need specific tools for a short time, you can often rent them from tool rental shops.

Important Note: Engine rebuilding is a complex process requiring extensive mechanical knowledge and experience. If you're not comfortable with engine work, it's highly recommended to have it done by a qualified professional.