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Maunder Minimum
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Discussion Starter #1 (Edited)
So you wanna change your cams and play with the big boys or just have some time to waste and feel some sudden love towards your stock cams? :hitit:
Every time you remove the VVT sprocket you need to go through this procedure. If you dont do it this way , you run the chance of wedging the pin tight....thus making the VVT inoperable. No vvt = no optimum power at all rpms!
There's a TSB about this...I have tried it and is hard to do especially on a new sprocket + with their way you have no leverage(the cam) to turn it while it gets unlocked by the air pressure.

I wont go through the valve cover removal and all the rest as this is all obvious....and if it's not to you ....well ...stick to the appearance sections and have the job done by someone who has a bit more experience.


You have replaced the cam and you're ready to bolt up the VVT sprocket.
This is what it looks like:

That's the hole you're going to blow some air into(there's another one on the other side, don't worry about it where going to use ethier one).
Reinstall and tighten the bolt that holds the VVT sprocket.... by hand only.

Get some electrical tape and start taping ....criss crossing it until you have covered all the holes except the one your going to blow some air through.
You might want to clean the part with a bit of solvent beforehand so that the tape sticks and makes a better seal.


If you're reusing your old VVT wear some glasses and take a rag to cover the sprocket....there's still plenty of oil in there....ask me how I know.:eek::

Now you're ready to unlock it:

It helps to have an extra pair of hands for this part but its doable by yourself . Now start blowing some air (about 20 PSI worth of it)and start turning COUNTERCLOCKWISE...some times it takes a couple of shots...just work at it back and forth until you feel it unlocking and moving.
To give you an idea how much of movement where talking about, I marked it with some tape:



Now keep it fully turned(unlocked) and tighten the bolt that holds the VVT sprocket to the cam to 40ft-lbs.
Then you can go ahead and lock it back in place(clockwise) before reinstalling it on the head.
Voila.....;)

PS: If you spot any mistakes feel free to point them out.
 

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so after you have the vvti gear on the cams ( im assuming you dont tighten that bolt all the way to the cams?) the air unlocks the vvti gear then reinstall it with the cams still on and bolt it down then you take that bolt (that tightens the vvti gear to the cams) and move it clockwise to lock it?
 

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o yeah and thanks Many for the write up :)
 

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Maunder Minimum
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Discussion Starter #4
so after you have the vvti gear on the cams ( im assuming you dont tighten that bolt all the way to the cams?)
excactlly!

the air unlocks the vvti gear then reinstall it with the cams still on and bolt it down then you take that bolt (that tightens the vvti gear to the cams) and move it clockwise to lock it?
You lost me!!!!!
the clockwise action is to re-lock it after you have tighten that bold to the torque specks.
The bolt has nothing to do with the unlocking and locking ...it's only there to hold the sprocket in place.
Do you get it?
Doe's anybody else get it or I'm I unclear with my explanation?
 

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o ok so the gear tightened to spec on the cam is when you blow the air in that hole? then you watch for it to move (unlocking) then you put the cams back in the car. but how do you lock it back into place? so cams bolted down by those keepers and chain on you move the cam and locks back up? sorry just confused how you relock it. I understand how you unlock it with the air. install the cams back then somehow it locks up again?
 

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o so when the air is being blown in the cams you turn the cam gear by hand to unlock it, then before installing it you turn it back clockwise to lock it?
 

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lol i think i get it Many thanks.
 

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Apologies if I missed it; In the removal step, am I correct in assuming I need to unlock the VVT before loosening the bolt on the camshaft? I'm pretty sure I understand the rest of it, see what happens when I try it out :p:
Thanks Many.
 

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From the Matrix manual:
"Confirm if the camshaft timing gear assembly re-
volves in the timing advance direction (left/counterclockwise) when weak-
ening the air pressure of the timing retard path"
Hold Pressure
"The lock pin is released, and camshaft timing gear, revolves in
the advance (to the left) direction."
"When the camshaft timing gear comes to the most
advanced (counterclockwise) position, take out the air pressure of the
timing retard side path (We're only using 1 hole in this version)"
Check smooth revolution
"Revolve the camshaft timing gear assembly within
the movable range except for the most retarded (clockwise)
position several times, and check the smooth revo-
lution.
CAUTION:
Be sure to perform this check by hand, instead of air pres-
sure.
(A) Check the lock in the most retarded (to the right) position.
(B) Confirm that the camshaft timing gear assembly is
locked at the most retarded position."

So, is this right?
1. Install VVT-i sprocket on cam.
2. Hand tighten fringe bolt
3. Cover all holes but one with electrical tape
4. Put 20psi of compressed air in the hole
5. Observe or assist the rotor moving to the left in a COUNTERclockwise position
6. Remove air
7. Once unlocked the rotor will move left and right easily
8. With no air and only your power, move the rotor to the right CLOCKwise
9. Stop when you feel the rotor contact the locking pin
10. Torque the bolt to 40lbs and remove the tape.
 

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Maunder Minimum
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Discussion Starter #12
o so when the air is being blown in the cams you turn the cam gear by hand to unlock it,
Yes!


then before installing it you turn it back clockwise to lock it?
NO....you torque down the bolt to 40ft-lbs then you lock it!


8. With no air and only your power, move the rotor to the right CLOCKwise
If you over turn it it will lock again and you would need to restart.

9. Stop when you feel the rotor contact the locking pin
No need too or else you will have to restart....

Her I have fixed your procedure:


7. Once unlocked the rotor will move left and right easily
8.While still unlocked ....Torque the bolt to 40lbs and remove the tape.
9-Turn the rotor to the right CLOCKwise to lock it.
10-Reinstall the cam.
 

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I personally have to thank EMSRacerceli03 for even having this issue to begin with. I had just installed my VVT-i rotor on my new Piper 3 cam and TOTALLY missed doing this procedure. I read it in the manual, but it absolutely did not make any sense on what the goal actually was. I guess the manual is written for actual Toyota technicians and NOT for me. THANK YOU MANY!!!!
 

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and i for ppl out there that want to check if you even need to do this process do what boosted stated. Take two wires one from the neg of the battery and one from the pos on the battery. Un clip the vvti accuator, run the two wires to the two prongs while the car is idleing. and if it stalles the gear is binded up(need to do this process) and if it changes over(doing this causes the vvti to retard timing) and should still run. If it still runs after that process no need to unlock it and lock it back up. :)
 

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i did not do this when i installed my piper cams !!

and my car is working fine is this procedure really was to be done ?

says nothing on the toyota repair manual


cheers
 

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Maunder Minimum
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Discussion Starter #18
i did not do this when i installed my piper cams !!
Are you sure your VVT is working?


says nothing on the toyota repair manual
There's a TSB about this

If you dont do it this way , you run the chance of wedging the pin tight....thus making the VVT inoperable. That's why you do it....you dont save time at the end....imagine having to remove it again to have it working.

and Cheers to you too!
 

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if it stalles the gear is binded up(need to do this process) and if it changes over(doing this causes the vvti to retard timing) and should still run. If it still runs after that process no need to unlock it and lock it back up
better double check that. you want it to stall meaning its working because the cam retards so much for the low RPM. if it kept running, that means the gear is locked and not changing.

this can also be done to check the LIFT OCV. do the same procedure and if the engien stalls out, the lift system is working.
 

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Are you sure your VVT is working?







If you dont do it this way , you run the chance of wedging the pin tight....thus making the VVT inoperable. That's why you do it....you dont save time at the end....imagine having to remove it again to have it working.

and Cheers to you too!
the car runs fine

dont no if the VVT is working or not

after installd the cams every thing was ok and i felt more power

also i have the Stock ECu i should get a cel if the VVT is not working right ?

i have the cams like a year now and nothing ever came up
 
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