[Vwdiesel] Timing Belt Tension

[Nate Wall]

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--
** Proprietary **

This is one of those things that comes w/ lots of practice.  People general=
ly get them too tight.  Basically, it should be tight, w/ out tension, but =
not floppy.  Made sense, didn't it?  I tension them to where the belt can b=
e moved slightly accross the pump pulley by pulling it towards you and push=
ing ot away from you w/ your fingers with some effort.  It should not vibra=
te (like a guitar stribng) when plucked.  If it whines when run, its too ti=
ght.  If you have it too loose, you will know it my pushing on it (it will =
be floppy.  You basically want to get ALL the loosness out of it, but w/out=
 puting it under tension.  A slight amount may be o.k.  These things actual=
ly get a little tighter as the engine warms up (the block and head expland).

I actually had one that made a loud "rapping" noise for the first couple of=
 minutes of engine operation on acceleration ONLY and ONLY if it was colder=
 than 30 degrees outside.  It took me months to find out what was going on.=
  Colder than 30 degrees allowed the belt to vibrate against the lower timi=
ng belt cover.  When the engine warmed slightly, it tightened enough and it=
 stopped doing it.  It even wore a hole in the lower cover!  I had no idea =
what it was until I removed the cover to replace the belt.

--Nate

Nate Wall,
WASTEC
Manager, Technical Programs

>>> Michael Alexander <malexand at inreach.com> 02/14/02 01:39PM >>>
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[ Picked text/plain from multipart/alternative ]
What is the correct way to estimate the timing belt tension on a 1600 NA
without the special VW tool? The original belt was low milage and twistable
with moderate effort to 45 degrees. I had to pull the injection pump in ord=
er
to extract a busted bolt from the air conditioner compressor bracket. I dec=
ided
to replace the belt since I had it off.


m alexander
--

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vwdiesel mailing list
vwdiesel at vwfans.com
http://www.audifans.com/mailman/listinfo/vwdiesel
--
[ Converted text/html to text/plain ]
This is one of those things that comes w/ lots of practice.  People general=
ly
get them too tight.  Basically, it should be tight, w/ out tension, but not
floppy.  Made sense, didn't it?  I tension them to where the belt can be mo=
ved
slightly accross the pump pulley by pulling it towards you and pushing ot a=
way
from you w/ your fingers with some effort.  It should not vibrate (like a
guitar stribng) when plucked.  If it whines when run, its too tight.  If you
have it too loose, you will know it my pushing on it (it will be floppy.  Y=
ou
basically want to get ALL the loosness out of it, but w/out puting it under
tension.  A slight amount may be o.k.  These things actually get a little
tighter as the engine warms up (the block and head expland).

I actually had one that made a loud "rapping" noise for the first couple of
minutes of engine operation on acceleration ONLY and ONLY if it was colder =
than
30 degrees outside.  It took me months to find out what was going on.  Cold=
er
than 30 degrees allowed the belt to vibrate against the lower timing belt
cover.  When the engine warmed slightly, it tightened enough and it stopped
doing it.  It even wore a hole in the lower cover!  I had no idea what it w=
as
until I removed the cover to replace the belt.

--Nate

Nate Wall,
WASTEC
Manager, Technical Programs
>>> Michael Alexander <malexand at inreach.com> 02/14/02 01:39PM >>>
--
[ Picked text/plain from multipart/alternative ]
What is the correct way to estimate the timing belt tension on a 1600 NA
without the special VW tool? The original belt was low milage and twistable
with moderate effort to 45 degrees. I had to pull the injection pump in ord=
er
to extract a busted bolt from the air conditioner compressor bracket. I
decided
to replace the belt since I had it off.
m alexander
--
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vwdiesel mailing list
vwdiesel at vwfans.com
http://www.audifans.com/mailman/listinfo/vwdiesel[1]

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