Hi all,

I changed my glow plugs last night. I had been having a hard time starting the car and finally metered the glow plugs by using a multimeter on the lowest resistance setting, connecting one lead to ground and the other to each connector on the glow plug relay connector. WITH THE SWITCH OFF. At least 2 showed infinite resistance (open).

It was a pain in the butt. I did not remove the injector lines. The socket sizes are indeed 8mm for the nut that secures the wire and 12mm for the glow plug itself. I had a 1/4 inch drive regular socket set and the plug would push the ratchet out. Got a deep set but they would not fit in the tight spots. Had to use an open end wrench which I immediately and repeatedly dropped down in between the injector pump and engine. Definitely get one of those dogbones mentioned previously. That will make a world of difference and should cut you beer consumption in half.

I changed 4 of the 5 and will change the last one (near firewall) after I purchase a different wrench or more beer. Starts right up!!

On my 300SD the glow plugs are below the injectors. The glow plug relay is on the front of the driver's side wheel well hump. Black plastic box. You can turn the key to the glow position and wait about 30 seconds and you will hear it click back off. You can follow the wires from the box to the glow plugs.

Hope this helps.

Matt

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Matt Camara
'83 300SD
'85 Celica
'98 Harley Springer Softail