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#1
10-25-2002, 09:23 AM
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Tips for Changing Glowplugs on OM603
I recall viewing a similar topic last year, but my search didn't return any such results.
My dash glowplug light no longer comes on. I can hear the relay click off after 45-60 sec of having the key turned on. The strip fuse shows continutity. Also, the car doesn't seem to start hard at 40 degrees. I still need to check the glow plug resistance and dash bulb, but need to take a proactive approach. I know the glowplugs on the 603 is different than on a 617. More difficult maybe? In case the glowplug(s) need replaced, I'd appreciate any comments from someone who has done this. thanks in advance.
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Lance Allison Lance@LanceAllison.com Current: 11 MB S550 4Matic, 55k miles, Designo Black/Black 14 Ford F150 XLT Lariat Crew, 73k miles, 5.0 Coyote V8 4x4. Black/tan. 09 GMC Envoy Denali, 5.3 V8, 4x4 SWB. 38k miles, Jewel Red/Med Gray. Gone: 87 MB 300SDL, 320k miles, Astral Silver/Blue. 98 VW Jetta TDI, 488k miles, Classic Green/Gray. 85 Olds 98 Brougham FWD, 4.3 DIESEL V6, 80k miles, 3x Gray. MBCA Member, Chicago Region 
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#2
10-25-2002, 09:43 AM
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While you may not actually need to change them all, the following thread shows pictures of my method of getting all the glow plugs changed at once:
What To Do? An advantage of this method is getting the opportunity to clean out all the accumulated gunk in the intake manifold - spewed in there over the years by the infamous EGR valve. Ken300D
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#3
10-25-2002, 11:44 AM
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Lance
I have changed the glow plugs on my '87 300SDL without having to remove the crossover pipe or the intake manifold. The key is to use a 1/4 inch drive extensions on your rachets with a universal joint at the socket. You will need find where the socket wrench fits beneath the intake manifold but it can be done. I had different sizes of extensions to perform the changes. Herb '82 240D '87 300SDL
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#4
10-25-2002, 08:27 PM
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When I replaced mine I removed the intake manifold, cross over pipe and injector lines. It made it a piece of cake.
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#5
10-26-2002, 01:54 PM
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It is possible to replace them with the intake in place, but you must have the proper (1/4-inch drive & deep socket) tools, and it's NOT easy. I recommend pulling the intake off, changing the plugs, cleaning the intake, replacing the intake gaskets (which ALWAYS leak around the #2 runner), and also replacing the IP vacuum shutoff if it is original (this job takes 5 minutes with the intake off and almost 2 hours otherwise.) Photos of the job on my sister's car are here:
http://www.meimann.com/images/mercedes/OM603_intake/ (I also tore off the ALDA tamper seal and turned it 1 turn CCW to improve off-idle performance.) Regards,
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