Category: Cylinder Head & Valve Train

Rocker Arms and Shafts Removal 1. Screw a 5 mm bolt into each rocker shaft oil control orifice, then pull out the rocker shaft oil control ori- fices. ROCKER SHAFT OIL CONTROL ORIFICE Clean. 5 mm BOLT O-RING Replace. O-RING Replace. 2. Remove the VTEC solenoid valve, then remove the sealing bolts. WASHER Replace. SEALING […]

SEAT WIDTH 2. Carefully grind a 45° seat, removing only enough material to ensure a smooth and concentric seat. 3. Bevel the upper edge of the seat with the 30° stone and the lower edge of the seat with the 60° stone. Check width of seat and adjust accordingly. 4. Make one more very light […]

Valve Clearance Adjustment Valves should be adjusted cold when the cylinder head temperature is less than 100°F (38°C). Adjustment is the same for both intake and exhaust valves. Adjust valve clearance at TDC of each cylinder. Do not rotate the engine counterclockwise. The tim- ing belt could jump a tooth on the camshaft pulleys. EXHAUST […]

Camshafts Inspection 1. Put the camshafts, the camshaft holders and holder pipes on the cylinder head, and then tighten the bolts to the specified torque. NOTE: Apply clean engine oil to 8 mm bolt threads. Specified torque: 8 mm x 1.25 mm bolts: 22N.m (2.2 kg-m, 16 Ib-ft) 6 mm x 1.0 mm bolts: 10N.m […]

Rocker Arms and Shafts Clearance Measure both the intake rocker shafts and exhaust rocker shafts. 1. Measure diameter of shaft at first rocker location. MICROMETER Surface should be smooth. 2. Zero gauge to shaft diameter. MICROMETER CYLINDER BORE GAUGE 3. Measure inside diameter of rocker arm, and check for out-of-round condition. Rocker Arm-to-Shaft Clearance (Intake […]

7. Slip a 6 mm steel washer and the correct driver at- tachment over the end of the driver (The washer will absorb some of the impact and extend the life of the driver). DRIVER 6 mm WASHER ATTACHMENT 8. Install the new guide(s) from the camshaft side of the head; drive each one in […]

Cylinder Heads Warpage NOTE: If camshaft-to-holder oil clearances (see page 6-34) are not within specification, the cylinder head cannot be resurfaced. If camshaft-to-holder oil clearances are within specifica- tions, check the cylinder head for warpage. • If warpage is less than 0.05 mm (0.002 in) cylinder head resurfacing is not required. • If warpage is […]

Rocker Arms and Lost Motion Assemblies Inspection NOTE: When reassembling the primary rocker arm, care- fully apply air pressure to the oil passage of the rocker arm. PRIMARY ROCKER ARM MID ROCKER ARM SECONDARY ROCKER ARM PISTONS Inspect the rocker arm pistons. Push them manually. — If they do not move smoothly, replace the rocker […]

Cylinder Heads Illustrated Index CAUTION: To avoid damage, wait until the engine coolant temperature drops below 100°F (38°C) before removing the cylin- der head. NOTE: Use new O-rings and gaskets when reassembling. Prior to reassembling, clean all the parts in solvent, dry them, and apply lubricant to any contact parts. 6 x 1.0 mm 10N-m […]

RUBBER BAND WASHERS EXHAUST ROCKER Replace. SHAFT INTAKE ROCKER SHAFT Rear Cylinder Head: SEALING BOLTS 20 mm 60N.m (6.0 kg-m, 43 Ib-ft) INTAKE ROCKER SHAFT WASHERS Replace. EXHAUST ROCKER SHAFT Front Cylinder Head: SEALING BOLTS 20 mm 60N.m (6.0 kg-m, 43 Ib-ft) RUBBER BAND EXHAUST ROCKER ARM ASSEMBLIES Rocker Arms and Shafts Locations Identify parts […]