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post #21 of 139 (permalink) Old 04-14-2014, 02:40 PM Thread Starter
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Would the NGK BP5ES plugs that I use in my 450SLC 5.0 and 380SLC 5.6 be appropriate for this 250?
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post #22 of 139 (permalink) Old 04-14-2014, 05:10 PM Thread Starter
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Date registered: Oct 2011
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Good news. If the starter on this car is bad I can use the one from my '74 450SLC parts car.
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post #23 of 139 (permalink) Old 04-14-2014, 09:54 PM
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Originally Posted by dgosh28 View Post
Would the NGK BP5ES plugs that I use in my 450SLC 5.0 and 380SLC 5.6 be appropriate for this 250?

That should definitely work. I think I got bp6es for mine based on someone's recommendation. Tom Hanson? Not sure. Just checked, yes. Tom Hanson.




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post #24 of 139 (permalink) Old 04-15-2014, 05:58 AM Thread Starter
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That should definitely work. I think I got bp6es for mine based on someone's recommendation. Tom Hanson? Not sure. Just checked, yes. Tom Hanson.




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They sent me the BP5ES, but it seems they are for US spec cars.
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post #25 of 139 (permalink) Old 04-15-2014, 09:18 PM
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That is a real compliment compared to the treatment I got after posting on the 107 forum.
The standards here must be much lower. :P
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post #26 of 139 (permalink) Old 04-16-2014, 05:42 AM Thread Starter
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The standards here must be much lower. :P
I am too new here to know about the standards, but the response time is definitely slower. There must be many fewer vintage Mercedes enthusiasts that I had hoped.
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post #27 of 139 (permalink) Old 04-16-2014, 07:00 AM
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The numeral in the plug's listing is for heat range. For whatever reason, NGK's heat rating numbers decrease as the plug gets "hotter". The "5" burns a little hotter than the "6".

You generally increase the heat range on a car which; tends to burn a bit of oil, runs consistently rich, has a weak ignition spark system or is used in mainly low speed applications. No significant performance issues, it's just a "work around" to address a specific problem.
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post #28 of 139 (permalink) Old 04-16-2014, 07:08 AM Thread Starter
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Originally Posted by Mike D View Post
The numeral in the plug's listing is for heat range. For whatever reason, NGK's heat rating numbers decrease as the plug gets "hotter". The "5" burns a little hotter than the "6".

You generally increase the heat range on a car which; tends to burn a bit of oil, runs consistently rich, has a weak ignition spark system or is used in mainly low speed applications. No significant performance issues, it's just a "work around" to address a specific problem.
Thanks. I really appreciate the explanation.
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post #29 of 139 (permalink) Old 04-19-2014, 05:43 AM Thread Starter
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Does anyone have a wiring diagram for the '71 250? I think field mice have eaten some of my wiring and there have been some modifications by previous owners. I want to attempt to put things back to factory standard.
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post #30 of 139 (permalink) Old 04-22-2014, 03:45 PM Thread Starter
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Has anyone had a problem with their gear shift lever getting stuck and not allowing the car to be shifted out of park? The previous owner disconnected the linkage, but the shifter still won't budge.
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