93 Camry timing belt questions

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Old 04 Oct 2004, 09:11 pm   #1 (permalink)
Fireant
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Default 93 Camry timing belt questions

Jr. and I replaced the timing belt on the 93 Camry. Put it all back
together, started alright and ran for a few miles before it quit. Checked
timing, found it was way off so we loosened the timing belt, put Crank at
TDC, rotated camshaft/distributor to #1 plug and re-installed timing belt.
Checked proper installation by putting it through 2 rpms, everything was
fine. Started it again, reset timing to 5 degrees BTDC, idled fine. Drove
a few blocks and the car died again.

For some reason the timing belt is jumping the gears. All I can figure is
that the tensioner pulley is not working right.
Question #1. The tensioner pulley is supposed to be free to take up the
slack, right?
Question #2: Haynes makes no mention of proper torque for the tensioner
pulley bolt. What is the right amount of torque for that bolt?

Thanks in advance. F


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Old 04 Oct 2004, 10:30 pm   #2 (permalink)
ROBMURR
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Default Re: 93 Camry timing belt questions

>For some reason the timing belt is jumping the gears. All I can figure is
>that the tensioner pulley is not working right.
>Question #1. The tensioner pulley is supposed to be free to take up the
>slack, right?
>Question #2: Haynes makes no mention of proper torque for the tensioner
>pulley bolt. What is the right amount of torque for that bolt?
>

In my 97 Camry Haynes manual it says once the belt is on
to tighten the idler pully(tensioner) to specification. which in
the front of the chapter says 31 Ftlbs of torque.

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Old 05 Oct 2004, 06:49 am   #3 (permalink)
Daniel M. Dreifus
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Default Re: 93 Camry timing belt questions

"Fireant" <fblackgoat@houston.rr.com> wrote in message news:<7pn8d.35739$N.14947@fe1.texas.rr.com>...

> For some reason the timing belt is jumping the gears. All I can figure is
> that the tensioner pulley is not working right.
> Question #1. The tensioner pulley is supposed to be free to take up the
> slack, right?


No. This is not correct. Although it may seem logical, it is not done
this way. I think the six cylinder has a hydraulic tensioner that
operates dynamically.
For the four cylinder as you're describing, there is a trick to
getting the belt tensioned correctly.
Loosen the bolt holding the tensioner pulley, and pull up or pry on
that pulley with a great deal of force to tension the belt, then
release, allowing the spring to hold the tension, and tighten the
tensioner pulley bolt. The spring will not exert enough tension by
inself, but will hold correctly once you have pre-tensioned the belt
manually. By the way, you should always use a new spring.
Since your new belt has been slipping, and belts are relatively
inexpensive, and go a long time before being changed, carefully double
check the edges of all the teeth before reinstallation to make sure
everything still looks new.
Some use a pry bar to pre-tension the belt, I used a sturdy hook tool
from a "hook and pick:" set, and pulled up very firmly about three
times, pulling strongly enough to move the engine.
You should also remove the tensioner and idler pulleys while you're
there, spin them by hand, and make sure they turn freely, smoothly and
quietly on the bearings, and that there is zero free play as they
rotate.
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Old 05 Oct 2004, 07:03 pm   #4 (permalink)
M. Hamill
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Default Re: 93 Camry timing belt questions

Here's some input from a sadder-but-wiser guy regarding timing belt
replacements: replace your idler pulleys/tensioners when replacing timing
belts. I had a belt replaced in Feb. 03. 13 months later, the new timing
belt broke, and it turned out the reason why was a worn bearing in a idler
pulley broke apart and cut the belt. If I'd had that done at the same time
as the first belt replacement, I'd have saved myself at least $500.

Mike
----
Fireant <fblackgoat@houston.rr.com> wrote in message
news:7pn8d.35739$N.14947@fe1.texas.rr.com...
: Jr. and I replaced the timing belt on the 93 Camry. Put it all back
: together, started alright and ran for a few miles before it quit...
:
: For some reason the timing belt is jumping the gears. All I can figure is
: that the tensioner pulley is not working right.



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