Okay, so i have a 1990 Nissan 240SX, with a KA24E, and im trying to replace the head because the one on my engine is warped, can anyone help me on how to take the old one off. Any help is needed. thanks guys and girls
How to remove the head?
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silslider13
- Posts: 89
- Joined: Fri Aug 27, 2004 11:07 am
- Car: 1990 Nissan 240SX Fastback
Undo the belts, drain your coolant, drain your oil. disconnect the intake/exhaust manifold from the head, pop off the valve cover, set the motor to 0 degrees on the crank, with the keyway on the cam sprocket pointing up. Loosen the cam Undo the cam by sticking a metal rod into the cam sprocket to keep it from moving, and put a 24mm socket on the bolt for the sprocket. When the nut is off, pop off the sprocket and set the chain off to the side. Take off the water pump, distributor, and oil pump. Get to the cam towers, you'll see some bolts holding it in place. start from the back two and go to the front two, alternate that way when loosening your cam bolts. Now you've got your head bolts holding the head in place. From the rear drivers side, that's #1, the rear passengers side is #2, front drivers side is #3, front passengers side is #4, etc till you get all 10.
NOTE: When you're undoing your head bolts, undo them in 2 or 3 steps making sure that they're being loosened pretty evenly. I do it in 90 degree increments, it takes longer but is very slow and steady. With the head bolts off, you can now pull off the head.
Installation is just the reverse, but you'll need the torque specs if you're going to reassemble the motor properly.
Torque procedure for head bolts:1. Tighten to 22ft-lbs working from middle drivers to middle passengers, then passengers side bolt just in front of the middle, then to the drivers side bolt just behind the middle bolt, to passengers side bolt just behind the middle, to the drivers side just in front of the middle bolt, to the passengers side rear most bolt, drivers side front most bolt, drivers side rear most bolt to the passengers side front most bolt. Again I do this in 90 degree increments until I get to the specified torque. Once they're all nice and even, I go to the next torque spec, tighten them all to 58 ft-lbs using the same method. Now loosen them all completely and retighten to 22ft-lbs. Once again, when they're all good and even, tighten to 54-61 ft-lbs. That will get the head back on.
crank pulley torque 87-116 ft-lbs
NOTE: When you're undoing your head bolts, undo them in 2 or 3 steps making sure that they're being loosened pretty evenly. I do it in 90 degree increments, it takes longer but is very slow and steady. With the head bolts off, you can now pull off the head.
Installation is just the reverse, but you'll need the torque specs if you're going to reassemble the motor properly.
Torque procedure for head bolts:1. Tighten to 22ft-lbs working from middle drivers to middle passengers, then passengers side bolt just in front of the middle, then to the drivers side bolt just behind the middle bolt, to passengers side bolt just behind the middle, to the drivers side just in front of the middle bolt, to the passengers side rear most bolt, drivers side front most bolt, drivers side rear most bolt to the passengers side front most bolt. Again I do this in 90 degree increments until I get to the specified torque. Once they're all nice and even, I go to the next torque spec, tighten them all to 58 ft-lbs using the same method. Now loosen them all completely and retighten to 22ft-lbs. Once again, when they're all good and even, tighten to 54-61 ft-lbs. That will get the head back on.
crank pulley torque 87-116 ft-lbs