timing cam shaft issues.

[sno_boarder4343]

ok so i am trying to do the timing on my 90 laser rs and i was trying to line up the timing marks on the cam shaft so i was rotating it around a few times to see if i could get them right, but the cam wont turn anymore, or it will but i have to use tons of torque on it to get it past the problem but after it gets past it it turns fine again untill i get back to the same spot. whats wrong and how can i fix it?

 

[NOSLO2PT0]

ok so i am trying to do the timing on my 90 laser rs and i was trying to line up the timing marks on the cam shaft so i was rotating it around a few times to see if i could get them right, but the cam wont turn anymore, or it will but i have to use tons of torque on it to get it past the problem but after it gets past it it turns fine again untill i get back to the same spot. whats wrong and how can i fix it?

Hopefully you are just coming to a point on the cam where the lobe is trying to push down on the valve. Gonna have approx. every 1/4 revolution of the cam. The cam gear has a dowel pin that should be in the 12o'clock position in order for the cam to be close. So no need to really rotate the cam THAT much.

 

[SrKegler]

Sounds like valves may be hitting the piston.

 

[jp91gsturbo]

That is deffinately a valve hitting a piston. You need to stop! Like yesturday. The easiest way to fix this without tearing anything up to much more is to remove the valve cover and loosen all the cam cap bolts so there is no pressure on the valves. Once you've done that undo the timing belt and pull it off. Set the crank to top dead center for the piston closest to the driver side. Turn your cams so that the alightment pin is facing straight up on both cams. Make sure your balance shaft and oil pump sprockets are in the right place. Line the cams up with a ruler and put the belt on them and use zip ties or clips to hold them in place then work your way clockwise. Make sure the tension is set right and tighten it down and try and turn it again. My guess is its going to be a hell of a lot easier if the motor is timed properly. Once you do all that and get it back together and start it up, if its running like ass, you may have bent a valve in the proccess of "putting a ton of torque" to turn the motor over.

 

[rlacasse1]

If you already have the crank lined up then just turn it 1/2 a turn. That will put all the pistons half up the cylinder and the valves won't hit them. Just make sure you turn it the opposite way to line it back up.