Greetings, I'm a new Benz owner but have some experience with diesel engines.

I'm trying to get my 'new' 1983 300D on the road and as I pulled all the glow plugs out, I found that they're all dead! I measured infinite resistance when holding one the leads at the threaded end with the nut and one at the threaded part that screws into the engine block.

Why would all 5 go?

Thanks,

Rick

If you are measuring them correctly ... the usual cause is build up of carbon which shorts them out... find a proper MB reamer , coat with heave grease, carefully ream and clean out... then put in new Bosch...

Try giving them 12 volts and seeing if they glow bright orange. Put the ground lead on the body of the GP and the positive lead on the tip where the wire goes. CAREFULL they get REALLY hot.

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See dieselgiant.com for a W123 GP/Relay turorial.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Thanks folks, will do.

R

If I were you I would seriously consider having the timing checked on the injection pump. An out of timing pump will eat a load of glow plugs.

lots of luck, Stark

What is the year of your car? Do you have the plugs with the loop on the end or pencil type plugs?

If loop type there is no continuity between the tip and the base. I just mention these things in case there is a misunderstanding taking place.

The car is a 1983, he said so in his first post. One possible reason for five bad glow plugs is a stuck-ON glow plug relay.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970