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Old 04-06-2010, 10:16 PM
chetwesley's Avatar
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Join Date: Jan 2007
Posts: 745
Is there anything special about the bolts on the w123 power steering pump?

I was having weird steering issues when parallel parking and found that two of the bolts from my PS pump were missing!

That means only one bolt left

I found one of the nuts laying inside the engine bay at the base of the fender, so I can use that to gauge the thread and size...

Do the bolts actually thread into the pump/mounting? Or is it just supposed to be a bolt/nut washer sort of thing?

I looked at the FSM, but it doesn't give clear details about the bolts, just what to loosen to take it off.
1979 240D w/4 Speed Manual, Light Blue Estimated 225-275K Miles - "Lil' Chugs"
Sold but fondly remembered: 1981 300TD Turbo Tan 235K miles, 1983 300SD Astral Silver 224K miles

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Old 04-06-2010, 10:51 PM
Biodiesel300TD's Avatar
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
They are all through bolts with nuts on the back. FWIW the bolt heads are all 13mm.
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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Old 04-06-2010, 11:01 PM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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the bolts are about 4 1/4in long. no they don`t thread into anything.
the top left is the pivot bolt, bottom left and top right are in the slot for adjustment.
the adjuster bolt is on the top right. this is facing from the front.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 04-06-2010, 11:06 PM
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Join Date: Mar 2010
Location: Orillia, Ontario
Posts: 201
make sure to replace them with bolts of the correct hardness; compare the markings on the head of the remaining bolt and be sure to match them. Too soft a bolt could be bad.....
Currently rebuilding engine on 300GD
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Old 04-07-2010, 12:03 AM
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Join Date: Aug 2007
Location: SE Mich
Posts: 2,996
Originally Posted by smiffy6four View Post
make sure to replace them with bolts of the correct hardness; compare the markings on the head of the remaining bolt and be sure to match them. Too soft a bolt could be bad.....
Typically the hardness is 8.8, which is kinda like SAE grade 5.
Standard for automotive no need for the superhardness of aircraft bolts.
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1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
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