Obviously rubber or cork gaskets will fill larger grooves whereas copper or steel gaskets like head gaskets can only fill much smaller grooves. You can use compressed air in between washing. Disconnect all vacuum lines attached to head and mark them. Use the ratchet begin to break the cylinder head bolts loose. You can buy a head gasket for your particular model Z24 from an auto parts store or your local Nissan dealer. Take care not to let any dirt or carbon particles fall into the engine while you are working on it. Place rags around the head and use a brush and solvent to remove the sludge.
I just helped my neighbor out yesterday replacing head gaskets on his diesel pick up. After tightening the head bolts, refit the pushrods in their original places, followed by the rocker shaft or separate rockers. Torque-to-yield head bolts stretch when they are torqued to allow them to tighten properly and repeated application can cause the head bolt to break. Once all the bolts have been loosened they may be removed one at a time. If the engine has a timing chain, after removing the camshaft cover, remove the nut from the camshaft sprocket.
Check head surface for straightness. Make sure the vehicle can not be started by removing the negative cable from the battery. Use some of the parts cleaner or brake cleaner to clean up the valve cover and as much of the cylinder head as is reasonable. I usually loosen headbolts in pattern. Undo the nuts or screws holding the camshaft cover to the head.
Consult the manufacturer's specifications for the proper removal sequence for the engine being worked on. At any point during removing the head bolts, if questions arise, for some useful, quick advice. Make a sketch of all the connections to the head so that you can refit them correctly. Lower the head into place, taking care not to displace the gasket. We torque headbolts in pattern to prevent warping the head casting. The timing belt tensioner will be removed or released to take the tension off the belt. Make sure the crank pulley '0' mark lines up with the pointer.
Rocker arms Unbolt and remove the camshaft cover. Step 2: Time the engine to remove the belt. Loosen the clamps of the upper and lower radiator hoses and place the drain pan underneath them. The design of this site was heavily, heavily inspired by under their. Torque them several times - start at a lower torque working your way up to max. Disconnect intake manifold at head.
I trust 70 year old bolts more than I trust new stuff of unknown origin. Each bolt will be loosened but not removed. I just helped my neighbor out yesterday replacing head gaskets on his diesel pick up. Use the socket wrench to remove the bolts securing the intake manifold and the exhaust manifold and remove both of them. Removing a pushrod head Unscrew the rocker-cover nuts or bolts; do not over tighten when refitting.
Refit the rocker or cam cover, using a new gasket. This keeps the head casting flat on the block. Refill the cooling system and start the engine. After the rocker arm is removed, the rockers will be unbolted. Every engine has a special sequence and torque setting for the head nuts or bolts. Make note of timing marks on sprocket and chain. You may need a helper to lift the head.
If any valve cover gasket material remains, remove it at this time and clean any excess oil from the edges. Every engine will have its own procedures for the order that the head bolts are removed or tightened. On engines with separately mounted rocker arms, take off the nuts holding the arms and the pivot balls, then remove the arms and set them all in a row on a piece of paper numbered with their correct order, so you can refit them in the same places. Use a socket and bar to loosen the nuts or bolts securing the head in the reverse of the tightening sequence for the engine see car handbook. Step 3: Remove the timing belt.
Each engine is different and will have its own procedures to time. Lay the new gasket on the block, right way round: the upper side is marked 'top', 'haut' or 'oben'. Second time to 59 ft-lb. Once all bolts are removed, lift up on the gently; the head should come free easily. Most of the time the cylinder head should only be removed when replacing the head gasket or performing a engine rebuild. If you do remove them, fit new gaskets See.