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#1
01-07-2014, 01:28 PM
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preferred tool for vacuum pump removal w123?
i'm going to be pulling and replacing a vacuum pump later this week, is the preferred tool for getting at the bolts a ball-end hex wrench or a hex socket?
TIA
__________________
1981 NA 300D 310k miles 
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#2
01-07-2014, 02:09 PM
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Hmm
Quote:
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__________________
ASE Master Mechanic https://whunter.carrd.co/ Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 2003 Volvo V70 https://www.boldegoist.com/
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#3
01-07-2014, 02:17 PM
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Either work; I didn't have a hex socket of that size back when I first bought the car and dove in to the pump rebuild so I used a hex wrench aka allen wrench/key.
It went fine. But if I did it again I'd use a hex socket on a ratchet for easier loosening/tightening...
__________________
1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino http://i.imgur.com/LslW733.jpg The Baja Arizona Oil Burners Send a message if you'd like to join the fun  Left to Right - UberWasser, Iridium, Stuttgart-->Seattle,, mannys9130 Visit the W123 page on iFixit for over 70 helpful DIY guides!
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#4
01-07-2014, 02:26 PM
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Clean the bolts, insert the hex socket, give it a light tap in the inward direction (in toward the block) then remove. The tapping will help loosen any corrosion form the bolts.
__________________
$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment
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#5
01-07-2014, 02:33 PM
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It also helps seat the socket into the screw when you tap them. If you mess up the inside of one of those socket heads - well, let's just say you won't like it! It pays to take a second to clean them and tap the wrench into the socket.
Dan
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#6
01-07-2014, 02:32 PM
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Oh and the bottom bolt is a bit tricky if you're using a hex wrench due to tight quarters and no visibility from above.
Whoever had mine off before I owned it just said "oh well good enough" and when I removed it I found that bottom bolt to be finger tight. It was the source of a front engine oil leak that a shop in town couldn't find. Sigh.
__________________
1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino http://i.imgur.com/LslW733.jpg The Baja Arizona Oil Burners Send a message if you'd like to join the fun Left to Right - UberWasser, Iridium, Stuttgart-->Seattle,, mannys9130 Visit the W123 page on iFixit for over 70 helpful DIY guides!
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#7
01-07-2014, 03:03 PM
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I did this in the last year or two on both my 300D's. I suggest a straight hex socket since a ball tip risks rounding out the allen hole or breaking the tip off in the screw (happened to me on a rear upper oil pan screw). I may have had to resort to a ball-tip allen on a few screws due to access, don't recall. Maybe coat the threads with anti-sieze so easier next time. Insure that your gasket has a lower lip to catch any ball bearings if your pump doesn't have the enclosed type. There was a post w/ photos recently.
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