REPLACING CAMSHAFTS

1987 Toyota Corolla

Tiny

rasmataz

February, 28, 2008 AT 12:07 AM

Camshaft sprockets for the exhaust/intake are they messed together

Tiny

luckyjs

February, 28, 2008 AT 12:13 AM

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

rasmataz

February, 28, 2008 AT 12:29 AM

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

Tiny

luckyjs

February, 28, 2008 AT 11:28 AM

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

rasmataz

February, 28, 2008 AT 5:50 PM

The knock pin for the intake camshaft-where is it located, also the exhaust cam knock pin-

Tiny

luckyjs

February, 28, 2008 AT 10:43 PM

[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

February, 28, 2008 AT 11:02 PM


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

Tiny

mmprince4000

February, 29, 2008 AT 6:55 AM

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

Tiny

luckyjs

February, 29, 2008 AT 9:43 AM

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

February, 29, 2008 AT 10:08 AM

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

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