How to Change a Glow Plug on a Mercedes 300SD?

Answer A diesel engine relies on the compression of fuel and air during the combustion cycle. Combustion efficiency is reduced when a diesel engine is cold, so glow plugs heat the engine block and cylinde... Read More »

Top Q&A For: How to Change a Glow Plug on a Mercedes 300SD

How to Tell If a Mercedes Glow Plug is Bad?

Mercedes diesel engines use glow plugs instead of spark plugs to start the combustion process. An electrical current is sen into the glow plug, where resistance causes the glow plug to heat. The he... Read More »

How to Test a Mercedes Glow Plug Relay?

Glow plugs heat the cylinders in diesel engines to help start them. The glow plug relay uses a small amount of electrical current to close contacts to supply higher current to the plugs. If you sus... Read More »

How to Remove the Fan Clutch in the Mercedes 300SD?

The Mercedes 300SD keeps from overheating by employing a fan clutch, which regulates the engine cooling fan. When the fan is not needed for cooling purposes, the fan clutch turns it off, saving ene... Read More »

How to Replace the Alternator on a 1979 Mercedes Benz 300SD?

The Mercedes Benz 300SD's alternator creates and distributes power to the car's accessories. If the alternator light comes on while you're driving you have only a few minutes before the accessories... Read More »