Timing Chain How to?

[SHOwener1986]

Is there anything that I should know before I go ahead and take the timing chains off, they have streched and now make a loud slapping noise against the valve cover. I have the intake off and both valve covers off already. I just wanna know if I go ahead and un-bolt the thing I wont be in for any surprises, maybe a good walkthrough if one is availible somewhere.

Thanks!

 

[F-22 Raptor SHO]

You dont want to just "go ahead and take them off" before you secure the cams. when you take the chains off, the exhaust and intake cams are free to move about independently and may get out of whack before you put the new chains on. There is a special tool in the rotunda kit that holds both cams still while working on the chain/sprocket assembly. Looks like a steel bar with two down facing square notches in it that fit right on the end of the cams near the chains. If you look closely you will see the flat spots on the cam that are used to hold the cam still. You could get around this by using a couple of wrenches that grasp the middle of the cam where the cam has that little bolt shape in its diameter. A wrench on each of those that are secured will keep it from moving.

Are you sure the cam chain is stretched vs. the tensioner being bad? Many times the tensioner loses its ability to keep the chain taunt. This is caused by either a dirty oil port or a bad spring (most often its the oil port)

 

[SHOwener1986]

is there a tensioner on both the front and back of the motor? Also with the amount of play this chain has and with you saying it is most likely the tensioner, im going to check into this more.

 

[Sho-Driver]

If you set the motor to TDC, you do not need the cam position tool to do the work. Just don't move the cams out of place as they can snap out of TDC. You should be at TDC to even make the tool work anyway.

FWIW, you do not need the cam position tool in any case. You can manually set timing and visually insure that it is correct.