Camry Timing Belt Adjustment

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Old 28 Aug 2006, 12:03 pm   #1 (permalink)
marvinshos@yahoo.com
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Default Camry Timing Belt Adjustment

Recently changed timing belt on my 97 4 cylinder Camry. The two idler
pulleys seemed smooth and without any play. I turned the crank shaft
two complete turns with the tensioner pulley unlocked. After putting it
back together I notced the belt has a slapping noise at 2000 RPM.

Can I readjust the tension by only removing the upper timing belt
cover?

Can I change the tensioner pulley and spring with only removing the
upper cover?

Thanks in advance.

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Old 28 Aug 2006, 02:23 pm   #2 (permalink)
Daniel
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Default Re: Camry Timing Belt Adjustment

marvinshos@yahoo.com wrote:
> Recently changed timing belt on my 97 4 cylinder Camry. The two idler
> pulleys seemed smooth and without any play. I turned the crank shaft
> two complete turns with the tensioner pulley unlocked. After putting it
> back together I notced the belt has a slapping noise at 2000 RPM.
>
> Can I readjust the tension by only removing the upper timing belt
> cover?
>
> Can I change the tensioner pulley and spring with only removing the
> upper cover?
>
> Thanks in advance.

===============
I'm not sure about access through only the upper cover - you can try.
The main point is that the tension at the tensioner pulley spring is
insufficient to tension a new belt. Also, you should always use a new
spring.
You need to place a pry bar against the tensioner pulley, or use a hook
tool to exert a lot of force on the belt, then release the tension with
the adjustment bolt loose enough to permit movement, allowing the belt
to relax back being held by the spring tension.
That will work.
But the spring cannot exert enough initial tesnion all by itself and
you wind up with the belt too loose.
I used a hook tool, and pulled smoothly but hard enough with both arms,
to move the whole engine three times before releasing, and that worked
just fine.

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Old 28 Aug 2006, 04:25 pm   #3 (permalink)
marvinshos@yahoo.com
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Default Re: Camry Timing Belt Adjustment


Daniel wrote:
> marvinshos@yahoo.com wrote:
> > Recently changed timing belt on my 97 4 cylinder Camry. The two idler
> > pulleys seemed smooth and without any play. I turned the crank shaft
> > two complete turns with the tensioner pulley unlocked. After putting it
> > back together I notced the belt has a slapping noise at 2000 RPM.
> >
> > Can I readjust the tension by only removing the upper timing belt
> > cover?
> >
> > Can I change the tensioner pulley and spring with only removing the
> > upper cover?
> >
> > Thanks in advance.

> ===============
> I'm not sure about access through only the upper cover - you can try.
> The main point is that the tension at the tensioner pulley spring is
> insufficient to tension a new belt. Also, you should always use a new
> spring.
> You need to place a pry bar against the tensioner pulley, or use a hook
> tool to exert a lot of force on the belt, then release the tension with
> the adjustment bolt loose enough to permit movement, allowing the belt
> to relax back being held by the spring tension.
> That will work.
> But the spring cannot exert enough initial tesnion all by itself and
> you wind up with the belt too loose.
> I used a hook tool, and pulled smoothly but hard enough with both arms,
> to move the whole engine three times before releasing, and that worked
> just fine.


The Haynes aftermarket shop manual does not say anything about pulling
the idler pully up with great force. Is this to overcome the possible
friction at the tensioner pulley against its mounting? Is this the
first car you have done this with?

Being the belt has some tension in it, how many revolutions of the
crank shaft do you suggest after the three pulls on the tensioner
pulley?

Marvin

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Old 29 Aug 2006, 08:29 am   #4 (permalink)
Daniel
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Default Re: Camry Timing Belt Adjustment

marvinshos@yahoo.com wrote:
> Being the belt has some tension in it, how many revolutions of the
> crank shaft do you suggest after the three pulls on the tensioner
> pulley?

======================
First you pry or pull with some considerable force on the tensioner
pulley to tension the belt.
Then you allow it to relax back held by spring tension.
Whereafter you tighten the tensioner pulley adjustment bolt securely so
it is held in place.
Finally, you just turn over the engine a couple of times using the
crankshaft pulley bolt, just to make sure everything stays lined up.
The manual recommends two full revolutions at the crankshaft.

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Old 30 Aug 2006, 01:09 am   #5 (permalink)
johngdole@hotmail.com
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Default Re: Camry Timing Belt Adjustment

The 4-cyl will jump tooth on you unless you go very slow and smoothly
with the plugs removed. The spring tension really foul things up for
you.

Yes, you can adjust the tension by removing the upper timing belt
cover. But is the belt in reuse condition now? It may still work fine,
but I pesonally wouldn't trust it.

Make sure the belt is correctly seated in all the pulleys including
crank with the cover on. Turn slowly without the belt jump tooth as it
will most want to.

97 should be tensioned at 45 deg BTDC, not 0 TDC! This is very
important. This is where you should tighten the idler to 33 lb/ft. And
after that turn several more revolutions (the spec calls for two but I
do more). And each time the cam and crank timing marks should line up.

If the tensioner spring is the updated one, you should be OK. It's
gotten shorter to about 1.6 from about 1.8. But at about $5 cheap
enough to get a new one in any case after you spend all that time. Yes
you can change the tensioner and spring with the cover on, just don't
drop it or you'll have to fish it out.

You can pick up a torque wrench at your local Harbor Freight, on sale
for $12.99, reg $19.99 and use it on the idler if you don't own a
torque wrench already.


marvinshos@yahoo.com wrote:
> Recently changed timing belt on my 97 4 cylinder Camry. The two idler
> pulleys seemed smooth and without any play. I turned the crank shaft
> two complete turns with the tensioner pulley unlocked. After putting it
> back together I notced the belt has a slapping noise at 2000 RPM.
>
> Can I readjust the tension by only removing the upper timing belt
> cover?
>
> Can I change the tensioner pulley and spring with only removing the
> upper cover?
>
> Thanks in advance.


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Old 30 Aug 2006, 03:55 pm   #6 (permalink)
marvinshos@yahoo.com
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Default Re: Camry Timing Belt Adjustment

John,

I'm confused, please comment. You said the tension idler pulley should
tightened to 33lb-ft at 45deg BTDC and then turn the crank shaft 2 more
turns. Since the tension idler pulley is now locked the tensioner
spring won't add any additional tension to the belt. Did you accidently
reverse the adjustment sequence?

Marvin

johngdole@hotmail.com wrote:
> The 4-cyl will jump tooth on you unless you go very slow and smoothly
> with the plugs removed. The spring tension really foul things up for
> you.
>
> Yes, you can adjust the tension by removing the upper timing belt
> cover. But is the belt in reuse condition now? It may still work fine,
> but I pesonally wouldn't trust it.
>
> Make sure the belt is correctly seated in all the pulleys including
> crank with the cover on. Turn slowly without the belt jump tooth as it
> will most want to.
>
> 97 should be tensioned at 45 deg BTDC, not 0 TDC! This is very
> important. This is where you should tighten the idler to 33 lb/ft. And
> after that turn several more revolutions (the spec calls for two but I
> do more). And each time the cam and crank timing marks should line up.
>
> If the tensioner spring is the updated one, you should be OK. It's
> gotten shorter to about 1.6 from about 1.8. But at about $5 cheap
> enough to get a new one in any case after you spend all that time. Yes
> you can change the tensioner and spring with the cover on, just don't
> drop it or you'll have to fish it out.
>
> You can pick up a torque wrench at your local Harbor Freight, on sale
> for $12.99, reg $19.99 and use it on the idler if you don't own a
> torque wrench already.
>
>
> marvinshos@yahoo.com wrote:
> > Recently changed timing belt on my 97 4 cylinder Camry. The two idler
> > pulleys seemed smooth and without any play. I turned the crank shaft
> > two complete turns with the tensioner pulley unlocked. After putting it
> > back together I notced the belt has a slapping noise at 2000 RPM.
> >
> > Can I readjust the tension by only removing the upper timing belt
> > cover?
> >
> > Can I change the tensioner pulley and spring with only removing the
> > upper cover?
> >
> > Thanks in advance.


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Old 30 Aug 2006, 09:47 pm   #7 (permalink)
johngdole@hotmail.com
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Default Re: Camry Timing Belt Adjustment

No, I merely mentioned the steps of tightening the tensioner idler
pulley, and then turning the crank several revolutions to very all the
marks are still aligned.

Of course, before you tightened the tensioner pulley, you've already
turn the crank two revolutions.

My advice to timing belt work is to follow the instructions to the
letter. The only difference I added was to turn the crank several more
turns than spec. That's all.

Now, did you turn the crank and verify the marks line up after you
tightened the tensioner pulley?


marvinshos@yahoo.com wrote:
> John,
>
> I'm confused, please comment. You said the tension idler pulley should
> tightened to 33lb-ft at 45deg BTDC and then turn the crank shaft 2 more
> turns. Since the tension idler pulley is now locked the tensioner
> spring won't add any additional tension to the belt. Did you accidently
> reverse the adjustment sequence?
>
> Marvin


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Old 31 Aug 2006, 03:58 pm   #8 (permalink)
marvinshos@yahoo.com
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Default Re: Camry Timing Belt Adjustment

When I did the timing belt 4 weeks ago I set the timing marks, forced
the idler tensioner pulley fully open to ease the installation of the
belt, installed a new belt, turned the crank shaft bolt two full turms,
locked the idler pulley and verified the timing marks were correct. The
engine is performing normally except at 2000 RPM there is a slapping
noise from the timing belt cover area. The noise ceases when the engine
RPM is not at 2,000.
I will be doing the readjusting on 9/1.

The clearance between the T belt covers and the fender wall requires me
to remove the dog-bone engine mount, the engine mount bracket and
relocte power steering fluid reservoir so I can the cover screws out.

Its a dog of a job. It took 6 hours to fully do the job. The hardest
part is removing the 2 bolts holding the engine mopunt bracket to the
engine block. One of them can be removed from under the car but the
other requires the engine to be jacked up a few inches. I'm curious
does everone with a 1997, 4 Cylinder engine have these problems? What
does a dealer get to do this job?

Thanks once again.
------------------------------------------------------------------------------------------------
johngdole@hotmail.com wrote:
> No, I merely mentioned the steps of tightening the tensioner idler
> pulley, and then turning the crank several revolutions to very all the
> marks are still aligned.
>
> Of course, before you tightened the tensioner pulley, you've already
> turn the crank two revolutions.
>
> My advice to timing belt work is to follow the instructions to the
> letter. The only difference I added was to turn the crank several more
> turns than spec. That's all.
>
> Now, did you turn the crank and verify the marks line up after you
> tightened the tensioner pulley?
>
>
> marvinshos@yahoo.com wrote:
> > John,
> >
> > I'm confused, please comment. You said the tension idler pulley should
> > tightened to 33lb-ft at 45deg BTDC and then turn the crank shaft 2 more
> > turns. Since the tension idler pulley is now locked the tensioner
> > spring won't add any additional tension to the belt. Did you accidently
> > reverse the adjustment sequence?
> >
> > Marvin


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Old 31 Aug 2006, 04:34 pm   #9 (permalink)
Nobody Important
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Default Re: Camry Timing Belt Adjustment

marvinshos@yahoo.com wrote:
> The
> engine is performing normally except at 2000 RPM there is a slapping
> noise from the timing belt cover area. The noise ceases when the engine
> RPM is not at 2,000.


I did this job about 8 weeks ago; there was some vibration in the belt,
but not enough to slap the cover. I think this happens because the load
on the belt changes cyclically as the various cam lobes engage.


> The clearance between the T belt covers and the fender wall requires me
> to remove the dog-bone engine mount,

yup

the engine mount bracket and

yup

> relocte power steering fluid reservoir so I can the cover screws out.


nope. I didn't have to do this on my '99 4 cylinder. I bought the
smallest air-powered socket wrench I could find and it fit between the
fender and the engine.


> Its a dog of a job. It took 6 hours to fully do the job. The hardest
> part is removing the 2 bolts holding the engine mopunt bracket to the
> engine block. One of them can be removed from under the car but the
> other requires the engine to be jacked up a few inches.


I didn't have to jack the engine up.


I'm curious
> does everone with a 1997, 4 Cylinder engine have these problems? What
> does a dealer get to do this job?


It took me about 1.5 7-hour days to do the belts and water pump. It
almost makes it worth the CAN$350 (plus parts) the local mechanic wanted
to do the job.
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Old 01 Sep 2006, 09:43 am   #10 (permalink)
proudpop
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Default Re: Camry Timing Belt Adjustment

I replace my timing belt and drive belts 2 weeks ago @ the dealer for a
cost under $350.00 US. It took them under three hours to do it.

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