tune up settings - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 06-17-2010, 09:47 PM Thread Starter
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tune up settings

what are the tune up settings, points gaps, spark plug gaps for a 1972 350 SL 8 cylinder 107 model
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post #2 of 6 (permalink) Old 06-18-2010, 06:33 PM
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Set points at .014, plugs .028-.032, advance or retard timing until there is no spark knock.
This is just for starters, rotor, cap and wires are very important.

Brian O
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post #3 of 6 (permalink) Old 06-18-2010, 07:28 PM Thread Starter
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Set points at .014, plugs .028-.032, advance or retard timing until there is no spark knock.
This is just for starters, rotor, cap and wires are very important.
thanks i will see if i can get it to hum like it used to. The exhaust system needs work, could a bad muffler or a leaky exhaust cause the car to not run smoothly?
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post #4 of 6 (permalink) Old 06-19-2010, 09:45 AM
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More than likely ignition is the problem, a leaky exh. will just sound bad especially is there is a spark miss. (pfoof phoof, type sounds)

Clean, scrape the dry black crud on the rotor and cap terminals to shiny brass. remove the spark plug caps, cut off 1/4 " poke an awl into the wire to open it up, screw it back into the spark plug cap and test pull. this is what I call the cheap tune up. and may smooth things out.

Brian O
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post #5 of 6 (permalink) Old 06-19-2010, 02:05 PM
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Originally Posted by finewine View Post
thanks i will see if i can get it to hum like it used to. The exhaust system needs work, could a bad muffler or a leaky exhaust cause the car to not run smoothly?
I have same car. Doubt exhaust would have much of an effect but sounds like it needs fixing anyway.

It's usually ignition (plugs, wires, points, rotor, cap) or injection (trigger points, mixture settings (ECU for idle, MPS for under load). Otherwise, could be also a vacuum leak, incorrect timing, need for a valve job.

Start with the cheap stuff. Make sure you use good wires and plugs. Don't use platinum or any other fancy plugs.

Tons of stuff on these D-Jets here on 107 forum, on Peachparts SL & Vintage forums and on MBCA SL forum.

Good Luck

PS: Best to fill in your user profile http://www.benzworld.org/forums/usercp.php

Last edited by MBGraham; 06-19-2010 at 02:07 PM.
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post #6 of 6 (permalink) Old 06-19-2010, 03:31 PM
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When I first got my 350SL I had the problem of running rough and flooding. The cause was the vacuum line from the manifold to the MPS. When I changed the line out and adjusted the timing it leveled out and runs great.
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