I just finished up the latest pictorial on how to troubleshoot your diesel vacuum system basics. I will cover the entire car in different pictorials as time allows.

http://dieselgiant.com/mercedesvacuumtroubleshooting.htm

enjoy

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

Great work. Thanks. When you say : "The nipples are small and very fragile and prone to cracking. If one breaks you will have to replace the entire line." do you mean the entire line with all fitting and T's and such going from the pump to the brake booster thingy? I broke a nipple off a T and was hoping to replace the T but trying to get the broken T out of the main tube seems like it is going to be tough. I have not tried hard yet but wont waste my time if it is a good idea to just replace the whole line when this happens.

thanks.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius

Ohhh I likey!! good job wanna do a body drain one?

YEAH!!!!!!! YOU ROCK

So, when testing a vaccume line, what pressure do you take it to?
When you check vaccume to the master cylinder, is the engine running?

Bacicly, Can you tell me/us how to properly do a vaccume test? I'm clueless as to how its done, and I may or maynot be the only one

Thanks alot DG, I really appreciate your awesome write ups and tutorials.
~Nate

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95 Honda Shadow ACE 1100.
1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle!
2012 Escape, 'hunter" (5 sp 4cyl)

Excellent write-up. I have to rebuild the vacuum pump on my '85 300GD. Not getting enough vacuum to the booster.

When are you going to do a write up on pumps?

Ok to test the supply line like in the pictorial the engine is running. A perfect vacuum is 30hg but only in theory. Around 25 is fine. To test other components use your hand vacuum pump and pump it up untill you get to around 25 or when the needle stops moving.

__________________
1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair