Vacuum Advance Issue M129 - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 01-19-2014, 09:36 AM Thread Starter
BenzWorld Member
Date registered: Oct 2008
Vehicle: 1959 190, 1961 190SL, 1967 250SE 4Spd, 1968 220D 4spd
Location: SoCal
Posts: 146
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(Thread Starter)
Vacuum Advance Issue M129

Hello Vintage Forum,

My 250SE sedan is slowly getting awesome. It runs beautifully now after a valve adjustment, linkage reset, and timing adjustment. However, I am having an issue with the vacuum advance on the distributor (and so I cannot check the advanced timing). The little diaphragm on the distributor won't hold vacuum...I suspect the problem is the interface between this diaphragm and the vacuum tube is leaky. What part is needed to make this interface air tight? Any ideas?

The car performs beautifully at low RPMs, but as expected, the timing doesn't advance at all, and performance is terrible at higher revs.
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