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#4691991 - 03/11/18 10:45 PM Vacuum pump for w116 300sd
Gito Offline


Registered: 08/30/09
Posts: 589
Loc: CA
Looking for a good vacuum pump to check for vacuum line leaks.
Just want a good quality hand help pump that will last.
I own a 1979 300sd Mercedes w116 with door lock and brake booster problems.


Any advice is greatly appreciated

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#4692004 - 03/11/18 11:08 PM Re: Vacuum pump for w116 300sd [Re: Gito]
WyrTwister Offline


Registered: 01/13/13
Posts: 1513
Loc: Texas
Being cheap I would go to harbor freight .
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God bless

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#4692007 - 03/11/18 11:13 PM Re: Vacuum pump for w116 300sd [Re: Gito]
AVB Offline


Registered: 05/20/12
Posts: 1283
Loc: Georgia
Harbor Freight does sell a Mityvac unit.

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#4692010 - 03/11/18 11:17 PM Re: Vacuum pump for w116 300sd [Re: Gito]
JHZR2 Offline



Registered: 12/14/02
Posts: 41779
Loc: New Jersey
Mityvac is just fine for troubleshooting MB diesels.

Have you verified that the mechanical pump is working properly? Some failures can dump metal into your engine. Rebuild kits are available...are the vacuum valves and dash pots all correct? It's fairly straightforward to isolate subsections and troubleshoot.

Good luck!

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#4692016 - 03/11/18 11:26 PM Re: Vacuum pump for w116 300sd [Re: Gito]
Trav Offline


Registered: 11/20/06
Posts: 18873
Loc: MA, Mittelfranken.de
I have this metal one from Mityvac, it does vac and pressure, great buy for $50.

http://www.tooldiscounter.com/ItemDispla...ASABEgL-hvD_BwE
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#4692132 - 03/12/18 06:49 AM Re: Vacuum pump for w116 300sd [Re: Gito]
bullwinkle Offline


Registered: 10/09/04
Posts: 7665
Loc: Cincinnati, OH, USA
Might check for excessive blowby-my old one had issues building up enough vacuum to overcome crankcase pressure!
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#4692221 - 03/12/18 08:32 AM Re: Vacuum pump for w116 300sd [Re: Trav]
Rand Offline


Registered: 08/20/03
Posts: 12641
Loc: NE,Ohio
Originally Posted By: Trav
I have this metal one from Mityvac, it does vac and pressure, great buy for $50.

http://www.tooldiscounter.com/ItemDispla...ASABEgL-hvD_BwE


if you dont need all those adapters

hf has a mityvac pump for about 30$ after coupon
https://www.harborfreight.com/mityvac-vacuum-pump-39522.html

The kit trav linked has quite a few more accessories but I'm not sure if those are needed for the additional $20
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#4692240 - 03/12/18 08:50 AM Re: Vacuum pump for w116 300sd [Re: JHZR2]
Gito Offline


Registered: 08/30/09
Posts: 589
Loc: CA
Originally Posted By: JHZR2
Mityvac is just fine for troubleshooting MB diesels.

Have you verified that the mechanical pump is working properly? Some failures can dump metal into your engine. Rebuild kits are available...are the vacuum valves and dash pots all correct? It's fairly straightforward to isolate subsections and troubleshoot.

Good luck!

As for the door locks not working, I discovered a broken vacuum line (yellow with green stripe) broken off at the door hinge area (drivers side).
Even before this line cracked, I was having trouble with the passenger door lock closing all the way.


Would like to test my cars mechanical vacuum pump. Want to pick up a good hand held vacuum pump to test.


Edited by Gito (03/12/18 08:53 AM)

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#4692248 - 03/12/18 08:56 AM Re: Vacuum pump for w116 300sd [Re: bullwinkle]
Gito Offline


Registered: 08/30/09
Posts: 589
Loc: CA
Originally Posted By: bullwinkle
Might check for excessive blowby-my old one had issues building up enough vacuum to overcome crankcase pressure!


Will check for blow-by today. Are we talking about just removing the oil cap and checking for oil spilling or shooting out while the engine is running?

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#4692356 - 03/12/18 11:13 AM Re: Vacuum pump for w116 300sd [Re: Gito]
JHZR2 Offline



Registered: 12/14/02
Posts: 41779
Loc: New Jersey
Originally Posted By: Gito
Originally Posted By: bullwinkle
Might check for excessive blowby-my old one had issues building up enough vacuum to overcome crankcase pressure!


Will check for blow-by today. Are we talking about just removing the oil cap and checking for oil spilling or shooting out while the engine is running?


That's a good start... When full hot, open the oil filler cap and see if it will just sit there (vibrating a bit of course), dancing, or being pushed clear off in an instant...

Have you done a compression test recently? Do PM on the GPs, ream and do a compression test at the same time... Its a worthy endeavour, IMO. But probably after a valve adjustment too!

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#4692371 - 03/12/18 11:26 AM Re: Vacuum pump for w116 300sd [Re: Rand]
Trav Offline


Registered: 11/20/06
Posts: 18873
Loc: MA, Mittelfranken.de
Originally Posted By: Rand
Originally Posted By: Trav
I have this metal one from Mityvac, it does vac and pressure, great buy for $50.

http://www.tooldiscounter.com/ItemDispla...ASABEgL-hvD_BwE


if you dont need all those adapters

hf has a mityvac pump for about 30$ after coupon
https://www.harborfreight.com/mityvac-vacuum-pump-39522.html

The kit trav linked has quite a few more accessories but I'm not sure if those are needed for the additional $20


Look closer the adapter are just an added bonus, this unit is metal and can switch between pressure and vacuum the one from HF is plastic. It is definitely worth the extra $20, its a much higher quality and useful tool and rebuild parts are available.
Unless it is being bought as a disposable one time use tool the longevity alone of the metal unit may make it cheaper in the long run.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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#4692957 - 03/12/18 09:05 PM Re: Vacuum pump for w116 300sd [Re: Gito]
AVB Offline


Registered: 05/20/12
Posts: 1283
Loc: Georgia
The metal one is definitely a good buy at $50 and more durable. I have owned one of the plastic ones for 7 or 8 years without a problem. It was all that I could find locally at the time, but I haven't found a reason to replace it.

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