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From: john on 17 Feb 2010 22:37
No, a serpentine belt transfers power from the crank pulley to all
accessory drives.

Yours is an alternator/AC belt. You also have a power steering belt.
This setup is an old jack screw (for Alt/AC) and slide rail (for PS)
adjuster design. It's cheap and clearly doesn't try to main proper
tension automatically as in those serpentine systems using automatic
tensioners.

So as described, you need to loosen the lock bolts and pivot bolts and
either turn a jack screw or use a pry bar against the PS pump to
adjust tension. Ideally, you'll need a Krikit-II gauge if not a more
versatile tension gauge. The Krikit-II is about $20 on Amazon.



On Feb 17, 4:01 pm, condor_...(a)yahoo.com wrote:
> 1)
> on the 1999 Lexus es300, the belt for the alternator is
> actually a serpentine belt, correct?  Meaning, that it
> connects multiple components.
>
> 2)
> How do I create more tension on the 1999 Lexus alternator belt?
> - move the alternator, or
> - move a pulley into tension, or
> - something else?  what's the secret?
>
> Thanks a lot!

From: john on 17 Feb 2010 22:43
Must be a 1908 Model T. :D

No, Yota uses cheap jack screw and slide rail tensioners.


On Feb 17, 7:34 pm, "Jeff Strickland" <crwlrj...(a)yahoo.com> wrote:
> I don't know what Ford you had, but my Fords have a spring loaded tensioner
> that never needs adjustment.
>
> Me thinks your Toyota might be the same.

From: FatterDumber& Happier Moe on 18 Feb 2010 04:50
condor_222(a)yahoo.com wrote:
> Dear Experts,
>
>
> I have a 1999 ES300, V6. Very similar to the Camry V6.
>
> I'm visiting Canada now (with the car), and it's really cold.
>
> For those of you who don't know, rubber is contrarian;
> rubber actually expands in the cold.
>
> So, my timing belt has stretched. When I press
> my finger beside the alternator, the belt has a lot
> of movement and give. It needs to be tightened.
> (Tires need to filled with more air too, and readjusted
> in the spring.)
>
> On the two Fords that I used to own, there were two
> different ways to adjust the belt.
>
> One had the old style, with a belt dedicated to the
> alternator. To tighten the belt, you loosed an alternator
> bolt, levered the alternator to make the tension high,
> and then tightened the bolt down. Similar to this:
> http://forums.motivemag.com/zerothread?id=3490925
>
> Another Ford had a big serpentine belt. To make
> more tension, you first loosened the lock bolt,
> turned a screw assembly to push a pulley into the
> serpentine belt, creating tension, and then
> tightened the lock bolt.
>
> Questions:
>
> 1)
> on the 1999 Lexus es300, the belt for the alternator is
> actually a serpentine belt, correct? Meaning, that it
> connects multiple components.
>
>
> 2)
> How do I create more tension on the 1999 Lexus alternator belt?
> - move the alternator, or
> - move a pulley into tension, or
> - something else? what's the secret?
>
>
> Thanks a lot!

You probably already googled this but here it is just in case you didn't,
http://us.lexusownersclub.com/forums/index.php?showtopic=55588
From: hls on 18 Feb 2010 21:15

"jim beam" <me(a)privacy.net> wrote in message
>
> incorrect on two counts:
>
> 1. rubber has a positive linear thermal expansion coefficient, not
> negative.
>

I remember there were rubber band "engines" run by heat. And those "rubber"
bands did contract when heated. Now, I dont intend to go back and research
all this, but, IIRC, there is a whiff of truth in the basic statement.

Let's just say that there are rubbers (latices) and elastomeric compounds
which we
call rubber.

I am interested in the concept, but not enough to make an issue of it.

BUT, his concept is flawed. The problem is almost certainly a worn or
improperly
tensioned belt.


From: jim beam on 18 Feb 2010 21:39
On 02/18/2010 06:15 PM, hls wrote:
>
> "jim beam" <me(a)privacy.net> wrote in message
>>
>> incorrect on two counts:
>>
>> 1. rubber has a positive linear thermal expansion coefficient, not
>> negative.
>>
>
> I remember there were rubber band "engines" run by heat. And those "rubber"
> bands did contract when heated. Now, I dont intend to go back and research
> all this, but, IIRC, there is a whiff of truth in the basic statement.

for some temperature ranges, yes indeed. but the belt our friend was
describing doesn't experience that, partially because it's not that kind
of "rubber", but mostly because of the reinforcing fibers.


>
> Let's just say that there are rubbers (latices) and elastomeric
> compounds which we
> call rubber.
>
> I am interested in the concept, but not enough to make an issue of it.
>
> BUT, his concept is flawed. The problem is almost certainly a worn or
> improperly
> tensioned belt.
>
>


--
nomina rutrum rutrum
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