Mechanics

REPLACING CAMSHAFTS

1987 Toyota Corolla

Engine Mechanical problem
1987 Toyota Corolla 4 cyl Two Wheel Drive Automatic 110000 miles

(I hope my donation is attached to this question, the Paypal return-to-index didn't indicate that there was a connection)

I am replacing the head gasket on a 1987 Toyota Corolla SR-5, A-F engine.
I removed the camshafts & sprocket and continued with the head gasket replacement. Now I am attempting to put it back together but have run into a problem - or at least a question:

Which direction is the " sprocket timing hole" supposed to face?

The cams and sprocket were removed intact, but when they are meshed with the alignment marks together, the sprocket timing hole is off 90 degrees from the top, pointing to the rear of the car. I don't know that it wasn't this way to start with, but the instruction in the Haynes manual has me baffled. &Quot; align the camshaft sprocket timing hole with the center mark on the cylinder head" (illustration shows the hole at the top of the sprocket, not 90 degrees to the right.

This manual does cover several engines (ours is the A-F) but there is no indication that this is different between them.
Can you help?
Avatar
Luckyjs
February 27, 2008.



Camshaft sprockets for the exhaust/intake are they messed together

Rasmataz
Feb 28, 2008.
Yes, that's more like it.

The cam installation marks line up on the inside when the exhaust camshaft knock pin is positioned about 9: 00, and the intake camshaft knock pin is positioned about 5: 00.(Illustration in Haynes manual)

Lucky

Tiny
Luckyjs
Feb 28, 2008.
On Toyota 1.6L DOHC 4AF and 4A FE engines in Corolla and Celica models, timing the camshafts also can be confusing because the cam gears have two sets of timing marks. Each set of marks has a particular purpose. One set is used to time the intake with the exhaust camshaft when they are mounted in the cylinder head, and the other set indicates the TDC position for both camshafts.

I've done this before with this engine back in the early 90's just not kicking in. Just hang in there, am giving it all I got

Rasmataz
Feb 28, 2008.
Yes, they mesh perfectly. The only problem is that when they do, the mark on the timing belt sprocket is 90 degrees from the top, point to the rear of the car.

Lucky

Tiny
Luckyjs
Feb 28, 2008.
The knock pin for the intake camshaft-where is it located, also the exhaust cam knock pin-

Rasmataz
Feb 28, 2008.
[quote="rasmataz"]The knock pin for the intake camshaft-where is it located, also the exhaust cam knock pin-[/quote
Here's a picture of the cams/etc


http://i271.photobucket.com/albums/jj131/luckysals/87Toyota_SR5_4A-F.jpg



Lucky

Tiny
Luckyjs
Feb 28, 2008.


http://i271.photobucket.com/albums/jj131/luckysals/87toyota2_SR5_4A-F.jpg


Tiny
Luckyjs
Feb 28, 2008.
The 4AFE has a removal and installation position. Once installed you rotate the cams back to the timing position using a cresent wrench on one of the square spots on the camshafts.

In other words, you put the engine to TDC #1, then you have to rotate the cams (timing belt removed) to install the service bolt in the intake cam. You take the caps/cams out. Reinstall, take the service bolt out and then rotate back to timing (service bolt hole would be at 9: 00) and 2 timing marks on front of cams would be pointing at each other

Mmprince4000
Feb 29, 2008.
Read, printed, re-read, re-read, re-read - it's getting clearer - but I'm not quite there yet either.

Interesting info from mmprince4000 - I still feel like i" m stuck in the twilight Zone - but it looks like I may be about to find my way out.

Tiny
Luckyjs
Feb 29, 2008.
Could you be more specific about this " service bolt"? The specs for the bolt are shown in the Auto Zone document - but i'm not clear on it's purpose. Aren't we bolting together two items (gear and subgear) that are already attached via a lock washer?

Lucky

Tiny
Luckyjs
Feb 29, 2008.
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