1974 240D Glowplug Question - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 05-16-2013, 08:22 AM Thread Starter
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1974 240D Glowplug Question

Hello I'm new to the forum and I purchased a beautiful 1974 240D for my son's graduation present.

I'm not sure how the glow plug deal is suppose to work. I take it the glow plug indicator is the "salt shaker" looking device in the center??? I've not noticed any indication light from that area...but the car will start and not roughly so I'm not sure what the issue is other than a possible bulb being out???

I will replace said bulb if that turns out to be the issue but I thought I'd querry the collective knowledge here first. 1. Am I correct as to where the glow blug indicator is? and 2. If it is the bulb how long should I wait to safely attempt to start the vehicle? and 3. Is there a risk of damage if we don't wait long enough? Any other advice would be greatly appreciated.

Thanks for taking the time to read and answer if you can.

Kind regards,

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post #2 of 4 (permalink) Old 05-16-2013, 01:26 PM
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Vehicle: 307D Tabbert Motorhome 1982
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I have a 1982 307D motorhome and have to wait about 30 seconds for the glow plug light to come on - mine does not start with a key, rather a pull out handle, which needs to be held for 30 seconds then she lights up.
I wouldn't have thought you will be doing damage starting it without the light on - does sound like a bulb/fuse
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post #3 of 4 (permalink) Old 05-16-2013, 08:57 PM
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On the W115 body, the salt shaker is located underneath and between the cluster and steering column. The shaker usually takes about 30 secs to glow nice and bright. It may take longer if glow plugs are old. I would recommend changing the glow plugs to a new fresh set since in cold days, starting the engine may be a pain. Try to warm up the glow plugs well before cranking engine. Once warmed, you do not need to pre-glow the glow plugs. Engine should start right up with no problem.
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post #4 of 4 (permalink) Old 05-16-2013, 09:56 PM
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I would also recommend upgrading the plugs, so you won't be stranded on the side of the road one day...

Mercedes Diesel Glow Plug Repair
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