Timing Belt tension on a 200Tdi

S

Steve

Guest

• Nov 13, 2005

• #1

Hi folks,
The manual says "tension with a lever-type torque wrench to 20Nm"

Is that right ? It sounds like bugger all.

Steve

 

T

Tom Woods

Guest

• Nov 13, 2005

• #2

On Sun, 13 Nov 2005 20:14:24 +0000, Steve
<[email protected]> wrote:

>Hi folks,
>The manual says "tension with a lever-type torque wrench to 20Nm"
>
>Is that right ? It sounds like bugger all.

Its not too far off what my workshop manual says for the 2.5 diesel
(29 to 23 Nm) - so its feasably correct.

 

P

Pieter Vroom

Guest

• Nov 14, 2005

• #3

If you are replacing the timing belt you need to double tension it, i.e.
tension correctly once, rotate engine by hand for a couple of revs, and
repeat tensioning. I think there is a good description on difflock website
(for 300tdi, but very similar).

Pieter

"Steve" <[email protected]> wrote in message
news:[email protected]...
> Hi folks,
> The manual says "tension with a lever-type torque wrench to 20Nm"
>
> Is that right ? It sounds like bugger all.
>
> Steve

 

S

Steve

Guest

• Nov 13, 2005

• #4

Pieter Vroom wrote:
> If you are replacing the timing belt you need to double tension it, i.e.
> tension correctly once, rotate engine by hand for a couple of revs, and
> repeat tensioning. I think there is a good description on difflock website
> (for 300tdi, but very similar).
>

Yes, I got that idea from the manual too, just the tension seems awfully
low.

Steve

 

A

Austin Shackles

Guest

• Nov 13, 2005

• #5

On or around Sun, 13 Nov 2005 20:14:24 +0000, Steve
<[email protected]> enlightened us thusly:

>Hi folks,
>The manual says "tension with a lever-type torque wrench to 20Nm"
>
>Is that right ? It sounds like bugger all.

nah, 's right. that's th eload on the tensioner, it's quite tight enough.
It's not the fixings.

--
Austin Shackles. www.ddol-las.net my opinions are just that
"For millions of years, mankind lived just like the animals. Then
something happened which unleashed the power of our imagination -
we learned to talk." Pink Floyd (1994)

 

N

Nick Williams

Guest

• Nov 13, 2005

• #6

On Sun, 13 Nov 2005 21:16:53 +0000, Steve wrote
(in article <[email protected]>):

> Pieter Vroom wrote:
>> If you are replacing the timing belt you need to double tension it, i.e.
>> tension correctly once, rotate engine by hand for a couple of revs, and
>> repeat tensioning. I think there is a good description on difflock website
>> (for 300tdi, but very similar).
>>
>
> Yes, I got that idea from the manual too, just the tension seems awfully
> low.
>
> Steve

You're not measuring the actual tension in the belt, though, you're measuring
the torque that results on the idler pulley, and the laws of geometry mean
that this is (likely to be) much lower than the actual belt tension.

Nick.

 

H

Huw

Guest

• Nov 14, 2005

• #7

"Nick Williams" <[email protected]> wrote in message
news:[email protected]...
> On Sun, 13 Nov 2005 21:16:53 +0000, Steve wrote
> (in article <[email protected]>):
>
>> Pieter Vroom wrote:
>>> If you are replacing the timing belt you need to double tension it, i.e.
>>> tension correctly once, rotate engine by hand for a couple of revs, and
>>> repeat tensioning. I think there is a good description on difflock
>>> website
>>> (for 300tdi, but very similar).
>>>
>>
>> Yes, I got that idea from the manual too, just the tension seems awfully
>> low.
>>
>> Steve
>
> You're not measuring the actual tension in the belt, though, you're
> measuring
> the torque that results on the idler pulley, and the laws of geometry mean
> that this is (likely to be) much lower than the actual belt tension.
>

Besides which and despite popular folklaw, it is not an elastic band.

Huw

 

A

Austin Shackles

Guest

• Nov 14, 2005

• #8

On or around Mon, 14 Nov 2005 13:10:43 -0000, "Huw"
<hedydd[nospam]@tiscali.co.uk> enlightened us thusly:

>
>"Nick Williams" <[email protected]> wrote in message
>news:[email protected]...
>> On Sun, 13 Nov 2005 21:16:53 +0000, Steve wrote
>> (in article <[email protected]>):
>>
>>> Pieter Vroom wrote:
>>>> If you are replacing the timing belt you need to double tension it, i.e.
>>>> tension correctly once, rotate engine by hand for a couple of revs, and
>>>> repeat tensioning. I think there is a good description on difflock
>>>> website
>>>> (for 300tdi, but very similar).
>>>>
>>>
>>> Yes, I got that idea from the manual too, just the tension seems awfully
>>> low.
>>>
>>> Steve
>>
>> You're not measuring the actual tension in the belt, though, you're
>> measuring
>> the torque that results on the idler pulley, and the laws of geometry mean
>> that this is (likely to be) much lower than the actual belt tension.
>>
>
>Besides which and despite popular folklaw, it is not an elastic band.

very true. The amount of stretch is minimal indeed.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Chuck didn't reply, so George swung round in his saddle. He could just
see Chuck's face, a white oval turned toward the sky.
'Look,' whispered Chuck, and George lifted his eyes to heaven.
(There is always a last time for everything.)
Overhead, without any fuss, the stars were going out"
Arthur C. Clarke, "The 9 billion names of God"

 

B

beamendsltd

Guest

• Nov 14, 2005

• #9

In message <[email protected]>
Austin Shackles <[email protected]> wrote:

> On or around Mon, 14 Nov 2005 13:10:43 -0000, "Huw"
> <hedydd[nospam]@tiscali.co.uk> enlightened us thusly:
>
> >
> >"Nick Williams" <[email protected]> wrote in message
> >news:[email protected]...
> >> On Sun, 13 Nov 2005 21:16:53 +0000, Steve wrote
> >> (in article <[email protected]>):
> >>
> >>> Pieter Vroom wrote:
> >>>> If you are replacing the timing belt you need to double tension it, i.e.
> >>>> tension correctly once, rotate engine by hand for a couple of revs, and
> >>>> repeat tensioning. I think there is a good description on difflock
> >>>> website
> >>>> (for 300tdi, but very similar).
> >>>>
> >>>
> >>> Yes, I got that idea from the manual too, just the tension seems awfully
> >>> low.
> >>>
> >>> Steve
> >>
> >> You're not measuring the actual tension in the belt, though, you're
> >> measuring
> >> the torque that results on the idler pulley, and the laws of geometry mean
> >> that this is (likely to be) much lower than the actual belt tension.
> >>
> >
> >Besides which and despite popular folklaw, it is not an elastic band.
>
> very true. The amount of stretch is minimal indeed.

Which is just as well, as setting the timing with a stretchy belt
could represent something of a challenge.......... ;-)

Richard
--
www.beamends-lrspares.co.uk [email protected]
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