What you will need:

1. Ratchet wrench set with deep sockets and universal joint
2. Screwdrivers
3. Six point combination wrenches (1/4", 5/16" 3/8" 7/16 and 1/2")
4. For GM; a J 39083 Glow Plug Connector Remover and Installer
5. Glow plug chamber reaming tool (Mercedes Benz or if required)
6. Valve cover gaskets (if required)
7. Penetrating lubricant

Why replace your Glow Plugs?

Diesel glow plugs live a hard life. They are subject to extreme temperature changes and high combustion pressures. Since a diesel engine may have as many as 10 glow plugs, one for each cylinder, you may not notice when one goes bad. But if two, three or more go bad; you will notice the engine has become very difficult to start.

Some vehicles have PCM's that monitor glow plug operation; most just use a Glow Plug Relay so you may not know you have any bad glow plugs.