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Vacuum pump for w116 300sd #4691991
03/11/18 09:45 PM
03/11/18 09:45 PM
Joined: Aug 2009
Posts: 697
CA
Gito Offline OP
Gito  Offline OP
Joined: Aug 2009
Posts: 697
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

Re: Vacuum pump for w116 300sd [Re: Gito] #4692004
03/11/18 10:08 PM
03/11/18 10:08 PM
Joined: Jan 2013
Posts: 2,100
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,100
Texas
Being cheap I would go to harbor freight .


Wyr
God bless
Re: Vacuum pump for w116 300sd [Re: Gito] #4692007
03/11/18 10:13 PM
03/11/18 10:13 PM
Joined: May 2012
Posts: 1,404
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,404
Georgia
Harbor Freight does sell a Mityvac unit.

Re: Vacuum pump for w116 300sd [Re: Gito] #4692010
03/11/18 10:17 PM
03/11/18 10:17 PM
Joined: Dec 2002
Posts: 42,301
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,301
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!

Re: Vacuum pump for w116 300sd [Re: Gito] #4692016
03/11/18 10:26 PM
03/11/18 10:26 PM
Joined: Nov 2006
Posts: 20,592
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,592
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


ASE L1, Master. Deutsch Meisterbrief.
Re: Vacuum pump for w116 300sd [Re: Gito] #4692132
03/12/18 05:49 AM
03/12/18 05:49 AM
Joined: Oct 2004
Posts: 8,334
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,334
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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Re: Vacuum pump for w116 300sd [Re: Trav] #4692221
03/12/18 07:32 AM
03/12/18 07:32 AM
Joined: Aug 2003
Posts: 13,144
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,144
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


2019 Jeep Cherokee Trailhawk 2.0T
Re: Vacuum pump for w116 300sd [Re: JHZR2] #4692240
03/12/18 07:50 AM
03/12/18 07:50 AM
Joined: Aug 2009
Posts: 697
CA
Gito Offline OP
Gito  Offline OP
Joined: Aug 2009
Posts: 697
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.

Last edited by Gito; 03/12/18 07:53 AM.
Re: Vacuum pump for w116 300sd [Re: bullwinkle] #4692248
03/12/18 07:56 AM
03/12/18 07:56 AM
Joined: Aug 2009
Posts: 697
CA
Gito Offline OP
Gito  Offline OP
Joined: Aug 2009
Posts: 697
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?

Re: Vacuum pump for w116 300sd [Re: Gito] #4692356
03/12/18 10:13 AM
03/12/18 10:13 AM
Joined: Dec 2002
Posts: 42,301
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,301
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!

Re: Vacuum pump for w116 300sd [Re: Rand] #4692371
03/12/18 10:26 AM
03/12/18 10:26 AM
Joined: Nov 2006
Posts: 20,592
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,592
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.
Re: Vacuum pump for w116 300sd [Re: Gito] #4692957
03/12/18 08:05 PM
03/12/18 08:05 PM
Joined: May 2012
Posts: 1,404
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,404
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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