Cylinder Head Assembly: Service and Repair
DISASSEMBLY
1. Drain the coolant and disconnect the upper radiator hose.
2. Remove the breather hose (between the air cleaner and the head cover).
3. Remove the air-intake hose.
4. Remove the vacuum hose, fuel hose and coolant hose.
5. Remove the cables from the spark plugs. The cables should be removed by holding the boot portion.
6. Remove the ignition coil.
7. Remove the power steering oil pump and bracket.
8. Remove the intake manifold.
9. Remove the heat protector and exhaust manifold assembly.
10. Remove the coolant pump pulley and the crankshaft pulley.
11. Remove the timing belt cover.
12. Remove the timing belt tensioner pulley.
13. Remove the timing belt.
14. Remove the head cover.
15. Remove the cylinder head assembly. The cylinder head bolts should be removed by using Special Tool, Cylinder Head Bolt Wrench (09221-32001, 09221-11000), in the sequence as shown in the illustration in two or three steps.
16. Remove the gasket pieces from the cylinder block top surface and cylinder head bottom surface.
NOTE: Make sure that the gasket pieces do not fall in the engine.
INSPECTION
1. Check the cylinder head for cracks, damage and coolant leakage.
2. Remove scale, sealing compound and carbon deposits completely. After cleaning oil passages, apply compressed air to make certain that the passages are not clogged.
3. Check the cylinder head surface for flatness by using a straight edge from the direction of A, B, ...as shown. If flatness exceeds service limit in any direction, replace the cylinder head, or lightly machine the cylinder head surface.
Cylinder head surface flatness:
Standard value: Less than 0.05 mm (0.002 inch)
Limit: 0.1 mm (0.0040 inch)
REASSEMBLY
1. Clean all gasket surfaces of the cylinder block and the cylinder head.
2. Install a new cylinder head gasket onto the cylinder head assembly. Do not apply sealant to the gasket and do not reuse the old cylinder head gasket.
3. Install the cylinder head bolts. Starting at top center, tighten all cylinder head bolts in sequence as shown in illustration, using the Cylinder Head Bolt Wrench(09221-11001). Repeat the procedure, retightening all cylinder head bolts to the specified torque.
Cylinder head bolt
M10: 30 Nm (300 kgf-cm, 22 ft. lbs.) + (60°-65°) + (60°-65°)
M12: 35 Nm (350 kgf-cm, 26 ft. lbs.) + (60°-65°) + (60°-65°)
NOTE:
When tightening the cylinder head bolt, using special tool and torque wrench, tighten the bolt to the specified torque [M10: 30 Nm, M12: 35 Nm] and then turn the torque wrench 60-65° and repeat it one more time as shown in illustration.
4. Install the timing belt tensioner pulley.
5. Install the timing belt on the camshaft sprocket, making sure that the tension side is tightened by turning the camshaft sprocket in reverse and all timing marks are in alignment.
6. Adjust the ignition timing.
7. Install the rocker cover and tighten the bolts to the specified torque.
Tightening torque
Rocker cover bolt: 8-10 Nm (80-100 kgf-cm, 5.9-7.4 ft. lbs.)
8. Install the timing belt cover.
9. Install the new intake manifold gasket and the intake manifold. Tighten the nuts and bolts to the specified torque.
10. Install the new exhaust manifold gasket and the exhaust manifold. Tighten the exhaust manifold attaching nuts to the specified torque.
11. Install the surge tank and tighten the nuts and bolts to the specified torque.
Tightening torque
Manifold nuts and bolts (both intake and exhaust): 15-20 Nm (150-200 kgf-cm, 11-14 ft. lbs.)
Tightening torque
Surge tank to inlet manifold nuts and bolts: 15-20 Nm (150-200 kgf-cm, 11-14 ft. lbs.)
12. Install the power steering oil pump and bracket.
13. Install the ignition coil.
14. Install the air intake hose.
15. Connect the vacuum hose, fuel hose and water hose.
16. Install the breather hose.