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Old 12-27-2016, 12:01 PM
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Join Date: Oct 2015
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76 mercedes 280c timing adjustment

76 280c with solex 4a1 carb see no vacuum line on distributor does anyone know how to chk and adjust the ign timing on this model should valves be adjusted first trying to troubleshoot hard starting when cold when engine finally warms up starts up no problems 114073 chassis

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Old 12-27-2016, 01:18 PM
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Join Date: Aug 2006
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Probably would be a good idea to check the valve adjustment if you don't know when it was last done.

The 76 North American M110 only had mechanical advance so no vacuum lines going to the distributor.
Your car was the last year with points so you need to check the condition of the points even though it has transistorized switching. They still wear and can also get gummed up.

Check the dwell before setting the timing. It should be between 30 and 40 degrees at idle.

Timing specs are: 7 degrees before top dead center at idle, 10-16 at 1500 rpm, 26-33 at 3000 rpm and 29-35 at 4500 rpm.

Check the operation of your choke to see if it is functioning properly. Make sure that the butterfly closes completely when set and can move freely. Those carbs are bad for warping if tightened down too much. This causes binding of the choke plate and the secondary stage butterfly as well as all kinds of other problems. If you have a hand pump check the operation of the choke vacuum pulldown.
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Old 12-27-2016, 06:45 PM
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thank you very much rick will do happy new years my friend

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