Install the distributor and spark plugs, using the marks you made in Step Three as a guide.
Turn the crankshaft 352 degrees clockwise to align the Before Top Dead Center mark on the crankshaft pulley with the timing mark on the crankshaft. Turn the crankshaft clockwise to align its timing marks, and adjust the valve clearance. Mount the drive gear for the distributor to the crankshaft, and tighten the mounting bolt for the crankshaft to between 51 and 65 foot-pounds with a torque wrench. Remove the wire holding the camshaft sprocket in place, and mount the sprocket to the dowel on the camshaft.
Replace the timing chain cover, and tighten its mounting bolt to between 7 and 11 foot-pounds. The final torque on the mounting bolts must be between 52 and 63 foot-pounds. Tighten the mounting bolts to the cylinder head in three separate passes with a torque wrench. Mount the rocker arm assembly over the dowels on the engine block. Hold the camshaft sprocket in place with the length of wire. Remove the wire holding the camshaft sprocket in place, and turn the crankshaft until the hole in the camshaft sprocket points straight up. Turn the camshaft clockwise until its timing pin points straight up. Place a new cylinder head gasket on the engine block, and mount the cylinder head to the dowels. Remove the old gasket from the engine block, and apply liquid sealer to the gasket mounting surface on the block. Lift the cylinder head from the engine block, and drain the oil from the crankcase to avoid contaminating the oil with coolant. Insert pry bars under the front and rear of the rocker arm assembly, and pry it off the mounting dowels. Remove the mounting bolts from the cylinder head with a socket wrench. Hold the camshaft sprocket in place with wire, and disconnect the cover for the timing chain from the cylinder head. Remove the mounting bolt for the camshaft sprocket with a socket wrench, and detach the distributor drive gear from the camshaft. Turn the crankshaft clockwise to align its timing mark with the timing mark on the timing chain. Remove the mounting nuts from the valve cover, and detach the valve cover. Disconnect the distributor assembly with a socket wrench. Mark the distributor housing and engine block to ensure you can install the distributor in the correct position later. Record the positions for the electrical leads on the spark plugs, and detach them them from the spark plugs. Disconnect any vacuum hoses and fuel lines as required to gain access to the cylinder head. Place a shop cloth over the carburetor to keep debris out of the engine. Place a large container under the radiator drains, and drain the coolant from the cooling system into the container for reuse.ĭisconnect the air cleaner from the carburetor with a socket wrench, including its hoses. Disconnect the flange nuts from the exhaust pipe, and detach it from the exhaust manifold.
Remove the cable from the negative battery terminal with a socket wrench. How to Replace a Head Gasket on a 22R Engine Connect the negative battery cable to the battery terminal. Put coolant back in the coolant system reservoir and place new engine oil in its tank. Look at the tag you label to help identify the components. Return the engine part back under the hood of the Toyota MR2: wires, hoses, covers, caps, anchors and brackets. The bottom bolt numbers from left to right are 10, 6, 1, 3 and 7. The tighten bolt numbers for the Toyota MR2 with a 1NZ-FE engine on the top row are 8, 4, 2, 5 and 9 from left to right. Pivot the bolts another 90 degrees in the third pass. Turn the bolts an extra 90 degrees for the second pass. Torque the new bolts for the cylinder head to 22 foot-lbs. Tighten the new bolts with a torque wrench in three steps. Install the new cylinder head bolts with your fingers. Review the cylinder head for damage, dents and leaks. Raise the cylinder head from out of the cylinder block. You will install new bolts when you position the new gasket. Loosen the cylinder head bolts in a circular sequence starting with the corners and work toward the center point of the cylinder head. Take out or separate the water filter, cowl top panel in the front, alternator, air cleaner assembly, accelerator cable, the middle exhaust pipe, exhaust manifold support, ignition coil, camshaft position sensor, fuel injectors, intake manifold, timing chain cover, camshaft sprockets and camshaft. Remove or detach the wires, spark plugs, assemblies, brackets, hoses, cables and bolts.
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