V90 multilink rear suspension transverse leaf spring anchore

Yuriy · Post by **Yuriy** » 01 Jun 2009, 02:09

The car is V90, 1998 year. Has 115000 miles on it. One week ago , when start driving - very noisy sound come from area under rear seat. Long story short - this car has multilink rear suspension with transverse leaf spring . This leaf spring has two anchorage ( p/n 6819183 ), one for each side. Each anchorage hold down by two flange screw ( p/n 949463 M10-12 ). Now, for some reason flange screw in passenger side have been broken - they head have been cut off very clearly. And leaf spring pushing anchorage up and it touched with inner shaft of CV drine axle, and produsing bad sound. When i take off a lot of rear suspension parts to got CV drive axle off - another surprise - second anchorage flange screws from opposite side have been cut as well. Right now i still working to take off lower crossmember ( p/n 9127279 ), which not easy - hardware has a lot of oxidation and corrosion. Then? Next step - drilling out the remains of flange screws out of lower crossmember. Then - make some calculation, maybe, to deside what bolt , thread and what kind of nuts choose for replacement.
Big question - why it happed in first place? Wrong hardware? Bed design? Or too much tork when installed? And - does anyone has same problen ever?

Post by **vegasjetskier** » 01 Jun 2009, 18:16

Wow, that's amazing. Someone must have hit something really hard to break those bolts off like that. The one on the left looks like it's been broken for a while with the rust on shear plane. The other one looks like it was just holding on by about 1/4 of its area until it finally snapped.

I would buy some brand-new bolts from Volvo so that you know you have the correct fit and strength, then torque them with a torque wrench to the Volvo specified torque.

Yuriy · Post by **Yuriy** » 02 Jun 2009, 08:00

This probably have been done long time before i got this car. Some times, when i park car in front of garage - and driveway is little bit uphill - and i hear little " klunk " from rear. Maybe it leaf spring mowed. About new flange screw - before i need remove somehow the rest of old screws. When it will be done - then i will see what hardware will fit holes after removing procedure done. If it " real screw ", not a bolt - thei i will go to install real bolt with fine thread, for sure it nit will brake again. This is idea.
By the way: both side CV boot looks good, and shaft does't have any free play inside CV joints. And i'm thinking:do i need really take off old boot and put new? This CV drive shaft Loebro made - looks really good condition. Any suggestion appresiated.

Post by **vegasjetskier** » 02 Jun 2009, 08:24

If the CV joints feel good and the boots aren't torn, I'd put the axle back in.

You can use EZ-outs (screw extractor) to remove the broken bolt parts. They should leave the female threads intact if you do it right. Your local Sears or auto parts store should have them, or buy online.

http://www.sears.com/shc/s/p_10153_1260 ... =extractor

Yuriy · Post by **Yuriy** » 02 Jun 2009, 12:24

That is good advise, thanks.
I'm still not removed yet lower cross member.
Is the screw king thread is better than regular bolt with nuts? I'm still keep both this variants in my head.

Post by **vegasjetskier** » 02 Jun 2009, 12:49

According to VADIS those are M10X30 Flange Screws, Volvo Part #949463.