W116, BENZ AID - COMMON QUESTIONS AND ANSWERS

1980 240d alternator troubleshoot

car wouldn't start, pulled voltage regulator, inner brush was worn out, while outer was over 1/4 inch. both were worn with same concave profile. does this spell alternator trouble?
i installed a borrowed voltage regulator, and all seemed ok first day. now, at idle, if i turn the lights on, it changes pitch of the engine. the engine bay is clean, and alternator looks newer even though the car has way over 300k.

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1991 300D Non-Return Valve / Booster Vacuum Line

In changing the serpentine belt I pulled at a line and broke the non-return valve in the middle of the main brake booster vacuum line. My car won't stop now and it's slightly important to do so because I have to get this car inspected for a state safety inspection. I'm thinking they won't look too kindly on a car that doesn't stop ;)

From the schematics, this is the brown plastic line that gets the vacuum when the key is shut off -- so everything adds up. I'm trying to find a quick fix as I wait on parts.

#1: I haven't been able to find just the valve, I think the line has to be replaced entirely?

#2: Is this as simple as unscrewing and reconnecting from the pump to the booster? Since there isn't fluid/anything else to deal with I wanted to make sure I don't neglect anything.

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1984 300D intermittent erratic temp. guage

Anyone ever experience this: "Old Yella" runs great as I have been retired a little over 2 years now and the car has become a hobby to me as well as my daily driver. With the help of this site I have got the vehicle pretty much re-born. There is one thing that I haven't been able to remedy. The car's water temp guage reads right where Mercedessource states it should 99% of the time,(a picture of the guage reading is on this site or in one of the manuals) just around the 80 degree celsius mark.

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