[V6-12v] Timing Belt Tensioner Torque Setting

Mon Oct 2 03:42:58 EDT 2006

Thanks Tom,

I think I solved the mystery overnight while looking through the various
manuals again.

These engines either came with an 8mm, or 10mm bolt to hold the tensioner.
The tension for an M8 car would be 22Nm, the tension for an M10 car would be
43Nm (unless Audi A4, which specifies 45Nm).

The confusion arises because BOTH the 8mm and 10mm bolts have an 8mm bolt
head! This is why we thought we had an 8mm bolt, whereas on my car (and
indeed most models, according to the parts catalogue) it is actually a 10mm
bolt which requires an 8mm allen key bit.

There is more confusion, because the manual for the 80/100 calls for 30Nm,
and than a 70Nm final stage tightening for the camshaft sprockets, while the
A4 procedure specifies 30Nm plus a half-turn. In practice though, these
probably provide similar torques, but I tend to prefer angle tightening for
critical bolts as in theory it should be more accurate.

Congratulations to Audi for making everyone's life easier as usual! :)

Cheers,

James

> -----Original Message-----
> From: Tom Christiansen [mailto:tomchr at gmail.com]
> Sent: 01 October 2006 18:56
> To: James Whitehouse
> Cc: The CyberPoet; v6-12v at audifans.com
> Subject: Re: [V6-12v] Timing Belt Tensioner Torque Setting
> 
> James,
> 
> According to Bentley:
> 
> Tensioner 8mm socket head bolt: 45 Nm
> Camshaft sprocket bolts: 30 Nm + 1/2 turn (180 deg).
> Crankshaft position sensor: 10 Nm.
> 
> Tom
> 
> On 10/1/06, James Whitehouse <james_whitehouse1 at yahoo.co.uk> wrote:
> > Hi Marc,
> >
> > Darn it, but I already did it up, and put the V-belt and covers back on!
> LOL
> >
> > Seriously, if anyone has the spec. and could let me know whether I need
> to
> > go back in there and up the torque, I'd be grateful.
> >
> > FYI my local garage looked it up in their standard tech book (where they
> > have procedures for all the timing belts on every car in Christendom)
> and it
> > says: pull the 8mm allen key to 4Nm to tension the belt, then tighten
> the
> > bolt to 45Nm.
> >
> > This still doesn't explain why the Audi workshop manual says 22Nm for an
> M8
> > and 43 for an M10.
> >
> > Help!
> >
> > James
> >
> > > -----Original Message-----
> > > From: The CyberPoet [mailto:thecyberpoet at cyberpoet.net]
> > > Sent: 30 September 2006 13:45
> > > To: James Whitehouse
> > > Cc: v6-12v at audifans.com
> > > Subject: Re: [V6-12v] Timing Belt Tensioner Torque Setting
> > >
> > > I would think with a bit of thread-locker (Loctite Blue), it would be
> > > fine.
> > > http://www.loctiteproducts.com/products/detail.asp?
> > > catid=10&subid=48&plid=153
> > >
> > > Cheers,
> > > =-= Marc Glasgow
> > >
> > > On Sep 30, 2006, at 3:42 AM, James Whitehouse wrote:
> > >
> > > > Hi All,
> > > >
> > > >
> > > >
> > > > Put the timing belt back in last night. Some confusion over the
> torque
> > > > setting for the timing belt. My Audi workshop manual gives two
> > > > torques:
> > > >
> > > >
> > > >
> > > > 8 mm bolt: 22 Nm
> > > >
> > > > 10 mm bolt: 43 Nm
> > > >
> > > >
> > > >
> > > > The tensioner on ours had two 8 mm holes one for pulling the
> > > > tension, and
> > > > one bolt, which we tightened to the 8mm setting (22 Nm). There was
> > > > no 10 mm
> > > > bolt on this car. However, 22 Nm seems offhand to be a little slack
> > > > to me
> > > > for such a critical bolt. Can anyone confirm the tension of the
> > > > timing bolt
> > > > for the 8mm when doing the belt timing from another manual like a
> > > > Bentley or
> > > > similar?
> > > >
> > > >
> > > >
> > > > What are Audi on about anyway with their 8mm / 10mm stuff? Is this
> > > > if you
> > > > get a tensioning roller with a 10mm bolt instead of an 8mm? I'm
> > > > confused and
> > > > it's not good to be confused about a timing belt torque setting!
> > > >
> > > >
> > > >
> > > > Cheers,
> > > >
> > > > James
> > > >
> > > >
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