From: cea1 on
I'm replacing the timing belt on my 2001, 3.4L, 4x2 Toyota Tacoma, and I'm
not quite sure about one and probably the most important detail. I'm using
a Chilton's shop manual and I understand all that it's directing me to do,
except when I install the tensioner the timing marks on the camshaft
pulleys rotate to the left by one tooth. I thought of rotating the
camshaft pulleys back by one tooth before installing the tensioner, but
I'm not so certain of this approach. I'm also skeptical of this approach
because the shop manual doesn't mention or direct me to do the
installation in this manner.

How can I correct this situation or will this not cause a problem.





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From: johngdole on
So you're saying the force of the hydraulic tensioner (not the
pulleys) turns the camshaft by about one tooth? This happened when the
crankshaft mark is still right on? I didn't realize a hydraulic
tensioner has that much force.

Usually you start installing the belt at the crankshaft and go
counterclockwise to the idler, left-bank pulley (viewed from rear of
engine), water pump, right-bank pulley and back to the crank. While
doing so did you make sure there is tension on the belt (that it is
not loose between the pulleys)? If loose you can be off by one tooth.
The marks on the t-belt then should be at the right places with the
marks on the pulleys.

Then you turn over two revolutions and check the marks. Is this when
you notice cam marks are off?

I see nothing unusual on Autozone's free repair guide for the 3.4L
(5VZ-FE, under 4 Runner). Looks like a typical install really.




On Aug 23, 4:17 am, "cea1" <c...(a)comcast.net> wrote:
> I'm replacing the timing belt on my 2001, 3.4L, 4x2 Toyota Tacoma, and I'm
> not quite sure about one and probably the most important detail. I'm using
> a Chilton's shop manual and I understand all that it's directing me to do,
> except when I install the tensioner the timing marks on the camshaft
> pulleys rotate to the left by one tooth. I thought of rotating the
> camshaft pulleys back by one tooth before installing the tensioner, but
> I'm not so certain of this approach. I'm also skeptical of this approach
> because the shop manual doesn't mention or direct me to do the
> installation in this manner.  
>
> How can I correct this situation or will this not cause a problem.

From: johngdole on
Excerpts from Autozone's free online repair guide on belt installation
below.
http://www.autozone.com/shopping/repairGuide.htm

This should help you make sure the t-belt has proper tension during
installation (even before installing the hydraulic tensioner). BTW,
the rotation and marks check is done after the hydraulic tensioner is
installed. That's why marks printed on t-belts help for V6 engines so
you don't have to keep removing/installing the belt. I4 is too easy.
No marks needed really.

You should always follow t-belt instrutcions especially to the letter.
If you buy a Gates Timing Component Kit, you'll also receive a brief
AllData instruction sheet. But Haynes or Chilton should be fine too. I
know Haynes is and these manuals often include hints for the home
mechanic compared to AllData or factory manual.

See "Timing Component Kits - Belt, Idler and Tensioner pulley"
section:
http://www.gates.com/brochure.cfm?brochure=2256&location_id=3487


From Autozone's guide:

13. Install the timing belt to the left camshaft timing pulley. Check
that the installation mark on the timing belt is aligned with the end
of the No. 1 timing belt cover as follows:

a. Using SST 09960–01000 or equivalent pin spanner tool, slightly
turn the left camshaft timing pulley clockwise. Align the installation
mark on the timing belt with the timing mark of the camshaft timing
pulley, and hang the timing belt on the left camshaft timing pulley.
b. Align the timing marks of the left camshaft pulley and the No. 3
timing belt cover.
c. Check that the timing belt has tension between the crankshaft
timing pulley and the left camshaft timing pulley.

14. Install the right camshaft timing pulley and the timing belt as
follows:

a. Align the installation mark on the timing belt with the timing
mark of the right camshaft timing pulley, and hang the timing belt on
the right camshaft timing pulley with the flange side facing inward.
b. Slide the right camshaft timing pulley on the camshaft. Align
the timing marks on the right camshaft timing pulley and the No. 3
timing belt cover.
c. Align the retaining pin hole in the end of the camshaft with the
pin groove of the pulley and install the retaining pin. Install the
bolt and tighten to 81 ft. lbs. (110 Nm).



On Aug 23, 4:17 am, "cea1" <c...(a)comcast.net> wrote:
> I'm replacing the timing belt on my 2001, 3.4L, 4x2 Toyota Tacoma, and I'm
> not quite sure about one and probably the most important detail. I'm using
> a Chilton's shop manual and I understand all that it's directing me to do,
> except when I install the tensioner the timing marks on the camshaft
> pulleys rotate to the left by one tooth. I thought of rotating the
> camshaft pulleys back by one tooth before installing the tensioner, but
> I'm not so certain of this approach. I'm also skeptical of this approach
> because the shop manual doesn't mention or direct me to do the
> installation in this manner.  
>
> How can I correct this situation or will this not cause a problem.

From: cea1 on
John,

Thanks for the info. Actually, I ended up taking a slightly different
approach. Since the camshaft pulleys were rotating by one tooth and also
the crankshaft sprocket, which I failed to mention in my original post, I
rotated both pulleys and the sprocket by one tooth before installing the
t-belt and the tensioner. Followed by installing the t-belt then the
tensiner which rotated all of the marks by one tooth. I turned the crank
four times to make share all of the marks and the dots on the camshaft
gears aligned correctly.

Thanks again!

cea1

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