Date: Fri, 07 Oct 2005 11:32:48 +0100
From: "Charles C." <>
Subject: Re: bottom shock mount on C900 a-arms

Charles C. wrote: > Craig's Saab C900 Site wrote: > >> "Charles C." <> writes: >> >> >>> Craig's Saab C900 Site wrote: >>> >>>> Dave Hinz <> writes: >>>> >>>> >>>>> On Wed, 05 Oct 2005 20:50:42 -0600, Charles <> >>>>> wrote: >>>> >>>> >>>>>> If you can get it off, maybe with some WD-40 or whatever penetrating >>>>>> stuff they might sell in the UK, get a tap and die the right size and >>>>>> clean up the threads before putting it back together. >>>> >>>> >>>>> WD-40 isn't a penetrating oil. It pretends to be, but for anything >>>>> other than _W_ater _D_isplacement, it's a lousy compromise. >>> >>> >>>>> Craig, someone must have a lower a-arm. If the threads are stripped, >>>>> for a shock, I'd rather replace the a-arm than to improvise. >>>> >>>> >>>> Yeah I know they're easy to get since there are a few European >>>> wreckers here >>>> in Sydney so there will be some C900's around waiting to be stripped. >>>> Getting new bushes is trivial. I'm surprised that the thread for the >>>> shock >>>> mount has appeared to have stripped so easily - I set my torque >>>> wrench to >>>> the right setting (around 60 ft/lb >> >> >> >>> WHAAAAAAAAT? Screams in astonishment. >> >> >> >>> That thread is about a 10mm thread (less?). There is no way you >>> tighten a nut on 10mm thread to anything more than 20 ft/lb (add that >>> I have no theoretical engineering background). >> >> >> >> Page 731-4 in 8V Bentley C900 manual... >> >> Tightening Torque for front shock absorber to lower control arm - 90 >> to 100 >> Nm (66 to 74 ft-lb). Seems quite high but it's quite a critical fastener. > > > Seen the photo in the haynes manual. Yup, bigger than a 10mm thread and > a 17 or 19 mm nut. > > Still it makes no reference to torque settings. > > I have also checked a newer manual (thus thiner) that makes no mention > of torque settings for the same bit. > >> >> > <snip my waffle> > >> >>> I wonder, for internal threads there is an insert that can be used to >>> rethread them. Would there be a similar sleeve to in effect rethread >>> the bit in question. Rethreading (in effect) a bold will weaken it >>> as it will be made thiner. > > > Bold = bolt :-( > >> >> >> Well if I can get the nut back off againt without damaging anything else >> (mainly the shock bushing itself), I'll see what's happened and then work >> out what to do. Either get a replacement a-arm from a wrecker, or see >> if I >> can repair the thread. I'm surprised that nylock nuts aren't used in that >> location but for some reason they aren't nylocks on this car (same on the >> lower shock mounting on the other side (which is a different situation >> - it >> needs the outer CV replaced and steering boot on that side replaced too). >> Perhaps the lower shock mount nuts should be nylocks? >> >> Craig. >> > The Nylock nuts are OK. (perhaps best as one use nuts). SAAB used in > those times many different threads (finer threads than the normal metric > bolts) and sometimes their nuts used a different (softer) metal instead > of plastic to do the locking. > > I wonder if new SAABs have a lot more nylock nuts ... cheaper etc. > > Sang the photo in the book and anticipating a cross threaded nut ... I > ^^^^ Seeing - spell checkers :-( > would try to put a cut, diagonally, on one of the flats of the nut (the > most accessible flat side) with a hacksaw. Anything to weaken it... > > Keep at it ... better you than me. > > Charles > -- Please remove _removeme_ to reply.

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