Q. re. '96 Corolla CAm Timing Mark

Wannacat
-MasterBlaster
--Wannacat
---MasterBlaster
-W. Stiefer

Author:
Date:
Subject:

Wannacat
2008-06-01 10:50:58
Q. re. '96 Corolla CAm Timing Mark

I'm changing the timing belt on my '96 Corolla. The hard part was
breaking free the harmonic balancer bolt. I tried jamming the camshaft
to keep the engine from spinning while turning the bolt, but after a
few sudden jumps, I began to worry that the timing belt was slipping
and tried another way. ( I wish I had looked at the timing marks
before turning that bolt, but I didn't.)

Now, with the crank at TDC, the cam sprocket is oriented at a peculiar
angle, as shown in the photo below:

http://i43.photobucket.com/albums/e382/bctucker/PICT0067.jpg

I assume that the "K-spoke", (one of two with a hole through it, the
other being the "A-spoke) should allign with the notch on top of the
bearing cap, and that I have in fact slipped two notches. But being
trained in the "never assume anything" school of thought . . . can
anyone confirm this assumption? How should the cam sprocket be
oriented at TDC?

Author:
Date:
Subject:

MasterBlaster
2008-06-01 18:12:06
Re: Q. re. '96 Corolla CAm Timing Mark

"Wannacat" <[email protected]> wrote:

You work for NASA (address above), and can't change a timing belt?
Oh. My. God. We're in a heap 'o trouble, kiddies!

> I'm changing the timing belt on my '96 Corolla.

> Now, with the crank at TDC, the cam sprocket is oriented at a peculiar
> angle, as shown in the photo below:
>
> http://i43.photobucket.com/albums/e382/bctucker/PICT0067.jpg
>
> How should the cam sprocket be oriented at TDC?

The SOHC "4A-FE and 7A-FE" engines start about 3/4 of the way down the page:

http://www.autozone.com/addVehicleId,2145902/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528006f043

Author:
Date:
Subject:

Wannacat
2008-06-01 13:52:11
Re: Q. re. '96 Corolla CAm Timing Mark

On Jun 1, 11:12 am, "MasterBlaster" <Nobody's.H...@My.Place> wrote:
> "Wannacat" <[email protected]> wrote:

<snip>

> > How should the cam sprocket be oriented at TDC?
>
> The SOHC "4A-FE and 7A-FE" engines start about 3/4 of the way down the page:
>
> http://www.autozone.com/addVehicleId,2145902/initialAction,repairGuid...

Ok,

It says: "Check that the camshaft pulley hole aligns with the mark on
the No. 1 camshaft bearing cap (exhaust side)."

But there are 2 holes. one on the "A-spoke" and another on the "K-
spoke".

I could choose one at random, but that might not be the best
approach.

I could look at the valve action and choose the alignment hole that
seems to give the most appropriate valve timing. That makes a bit more
more sense, but only a bit. Why should there be any guesswork about
it? Surely the point of using timing marks is to take the individual
judgement out of the job.

At NASA, we have procedures for validating tech manuals before
release, Apparently Chiltons and Haynes and Autozone do not.

Author:
Date:
Subject:

MasterBlaster
2008-06-02 17:30:10
Re: Q. re. '96 Corolla CAm Timing Mark

"Wannacat" <[email protected]> wrote:

> The SOHC "4A-FE and 7A-FE" engines start about 3/4 of the way down the page:
>
> http://www.autozone.com/addVehicleId,2145902/initialAction,repairGuid...

Ok,

> It says: "Check that the camshaft pulley hole aligns with the mark on
> the No. 1 camshaft bearing cap (exhaust side)."

I couldn't find that text anywhere on the page link I gave you.

Does the page you're looking at say:
"Timing Belt and Sprockets
Toyota Corolla 1988-1997 Repair Guide"?

While we're at it, which exact engine do you have?
4A-GE / 4A-F / 4A-FE / 7A-FE
There should be a sticker on the underside of the hood.

> At NASA, we have procedures for validating tech manuals before
> release, Apparently Chiltons and Haynes and Autozone do not.

But nothing to validate incoming signals that would prevent Orbiters
from crashing into Mars? :-P

Author:
Date:
Subject:

W. Stiefer
2008-06-01 22:08:59
Re: Q. re. '96 Corolla CAm Timing Mark

Whichever sprocket hole has both no. 1 cyl. valves closed.
Look at the cam lobes, adjust as necessary.
Don't bend anything!
"Wannacat" <[email protected]> wrote in message
news:1980d4e3-44a7-42b7-bc00-f497b309d5fd@q24g2000prf.googlegroups.com...
> I'm changing the timing belt on my '96 Corolla. The hard part was
> breaking free the harmonic balancer bolt. I tried jamming the camshaft
> to keep the engine from spinning while turning the bolt, but after a
> few sudden jumps, I began to worry that the timing belt was slipping
> and tried another way. ( I wish I had looked at the timing marks
> before turning that bolt, but I didn't.)
>
> Now, with the crank at TDC, the cam sprocket is oriented at a peculiar
> angle, as shown in the photo below:
>
> http://i43.photobucket.com/albums/e382/bctucker/PICT0067.jpg
>
>
> I assume that the "K-spoke", (one of two with a hole through it, the
> other being the "A-spoke) should allign with the notch on top of the
> bearing cap, and that I have in fact slipped two notches. But being
> trained in the "never assume anything" school of thought . . . can
> anyone confirm this assumption? How should the cam sprocket be
> oriented at TDC?
>

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