Other S60 Problem: CLONKING/KNOCKING when accelerating, or taking of

[jeffreyt]

here's the latest ,thinking about it made me laugh when I got home but not so funny at the Volvo dealer this morning.Parts store empty of customers,2 guys behind the counter,good omen I thought
' 2 XC90 driveshaft bolts please and here's the part number,
don't recognise that part number sir,whats your reg number,
well my car is an XC70 and ......
then you shouldn't be fitting XC90 DS bolts to it...sir and XC90 DS bolts come in 2 lengths and neither will fit your car ...sir .
Why do you want to fit XC90 DS bolts to your XC70 ?
well on the Volvo forum...at which point the parts assistant and the other assistant ( who had been listening in ) cast their eyes to the ceiling ...... then tell me they don't have any XC90 DS bolts in stock and would have to order them.
Hmnnnnnnnnn silence
OK says I ,do you have any XC70 DS bolts in stock,their eyes light up , yes sir and only £4.90 a pair !
At this price I've got nothing to lose so take them.
My thinking being that if they are as easy to fit as people on here say I might as well try them and see if it gets rid of the dreaded ping.
If it doesn't I can go on the hunt for the elusive XC90 DS bolts.
No one has ever mentioned the XC90 bolts coming in 2 sizes but I didn't feel wise enough to pursue this point with the asssistants even though someone was shouting 'horse manure ' in my head.
The standard XC70 DS bolt is 58mm from the inside of the large washer to the end of the bolt and it has a 10mm section of thread covered in red stuff .
Is the XC90 bolt of similar dimension ?

PS driving home I explained all this to my all knowing English Setter who had been asleep in the back of the car .After careful thought he said I love the room in the back here but if you swapped it for a Jag xtype estate I would still be happy......

[micken]

Originally Posted by jeffreyt

PS driving home I explained all this to my all knowing English Setter who had been asleep in the back of the car .After careful thought he said I love the room in the back here but if you swapped it for a Jag xtype estate I would still be happy......

PMSL at that. What did you tell him? Dream on?

[daddypruds68]

Right........spent the last 45 mins reading this thread from start to finish. I'm going to buy the xc90 bolts for my 2006 06 185bhp D5 S60 in hope to get rid of the flippin' clunk. Which ones do i ask for from my volvo stealer, and what bl**dy torque setting do i use??????? Whats this thing with the angles when setting the torque? Help please!!!!

Cheers
Ian

[Nick0]

Originally Posted by daddypruds68

I'm going to buy the xc90 bolts for my 2006 06 185bhp D5 S60 in hope to get rid of the flippin' clunk. Which ones do i ask for from my volvo stealer, and what bl**dy torque setting do i use???????

Ian you are asking for Volvo XC90 Driveshaft bolts, I believe the part number is 30714142 but you should check that for yourself. Picture attached of what they look like. VIDA says they should be tightened to 35NM which is not much. Many people (including me) have tightened them to 50NM. hope that helps.

[ASt85]

Tightening the bolt to an initial 35Nm, sets the contact centring of the bolt and bush, the further 90° tightening of the bolt establishes the required working torque for the bolt – it is actually around 50Nm.

However these are torque bolts and can only be correctly set by the final 90° rotation NOT TIGHTENING TO A GIVEN TORQUE.

They must be fitted “dry”, i.e. no grease present on the bolt thread or the internal axle thread (only the thread locker present). If grease is present, it will create the wrong tension and prevent the thread locker bonding correctly.

TORQUE BOLTS ARE USE ONCE ONLY BOLTS - their re-use can create incorrect thread tensions

[Nick0]

Originally Posted by ASt85

Tightening the bolt to an initial 35Nm, sets the contact centring of the bolt and bush, the further 90° tightening of the bolt establishes the required working torque for the bolt – it is actually around 50Nm.

However these are torque bolts and can only be correctly set by the final 90° rotation NOT TIGHTENING TO A GIVEN TORQUE.

They must be fitted “dry”, i.e. no grease present on the bolt thread or the internal axle thread (only the thread locker present). If grease is present, it will create the wrong tension and prevent the thread locker bonding correctly.

TORQUE BOLTS ARE USE ONCE ONLY BOLTS - their re-use can create incorrect thread tensions

Er, I'm no engineer and I'm sure you are spot on with this but I stuck mine in and torqued them up to 50NM and they have been absolutley fine.

[ASt85]

Yes, I'm sure they are absolutely fine torqued to 50Nm, because these bolts do set correctly by the torque + angle method to almost exactly 50Nm, but the correct way to get these torque bolts set correctly is by the initial 35Nm torque + 90°.

For any torque bolt, the correct final torque is the specified applied force + the specified angular turn, the resulting final torque will depend upon the thread type and the diameter of the bolt. For the XC90 DS bolts it equates to 50Nm, this might not be true for torque bolts used elsewhere on the car, so it is important to use the correct tightening method, in another bolt tightening exercise the final tension achieved might be considerably higher or lower, resulting in the premature failure of the bolt, or the bolt working loose during normal use. This sometimes occurs when grease is incorrectly used on wheel bolts, the resulting tension on the threads can be significantly higher even though the torque wrench may have been set to the correct torque - the result is a damaged thread leading to premature failure. (Wheel bolts are not torque bolts!)

Whatever you do - do not re-torque the bolts by slackening and the retighening.
Having once been stretched or torqued, torque bolts must be replaced with new ones, because the correct tension cannot be achieved for the safe use of the bolt. This statement is simply cautionary advice NOT CRITICISM

[ASt85]

As a PS - I ought to add that I not a purist in terms of "how to's" for any job.

The primary importance with these DS bolts is ultimate achievable safety i.e. the way specified in the manufacturer's workshop manual - it would also comply with insurers requirements re best practice' i.e. standard means of achieving a specified bolt's security

[daddypruds68]

Wow.......glad i asked!!! Bit frightened to do the job now. Flippin' heck!!

Ian

[SourDiesel]

Originally Posted by daddypruds68

Wow.......glad i asked!!! Bit frightened to do the job now. Flippin' heck!!

Ian

Not really, just torque to 35Nm then a final twist by 90 deg. Dead easy!