Cylinder Head Assembly
Cylinder HeadCombustion Chamber Volume 54.5 cc 3.325 cu in.)
Valve Guide Bore - Exhaust 6.005-6.025 mm (0.2362-0.2370 in.)
Valve Guide Bore - Intake 6.005-6.025 mm (0.2362-0.2370 in.)
Valve Guide Installed Height 14.050-14.550 mm (0.5531-0.5728 in.)
Valve Lifter Bore Diameter 12.008-12.030 mm (0.4728-0.4736 in.)
Valve System
Valve Face Angle 44.25 °
Valve Face Runout 0.038 mm (0.0015 in.)
Valve Face Width - Exhaust 2.750 mm (0.1083 in.)
Valve Face Width - Intake 2.180 mm (0.0858 in.)
Valve Head Diameter- Exhaust 30.470-30.730 mm (1.199-1.209 in.)
Valve Head Diameter- Inlet 36.830-37.090 mm (1.45-1.46 mm (
Valve Installed Height 35.26-36.69 mm (1.3870-1.4445 in.)
Valve Length - Exhaust 97.11 mm (3.8232 in.)
Valve Length - Intake 101.23 mm (3.9854 in.)
Valve Seat Angle - Seating Surface 45 °
Valve Seat Angle - Relief Surface 30 °
Valve Seat Angle - Undercut Surface 60 °
Valve Seat Runout - Maximum 0.080 mm (0.0031 in.)
Valve Seat Width - Exhaust Seating Surface 1.400-1.800 mm (0.0551-0.0709 in.)
Valve Seat Width - Intake Seating Surface 1.000-1.400 mm (0.0394-0.0551 in.)
Valve Stem Diameter - Exhaust 5.955-5.975 mm (0.2344-0.2352 in.)
Valve Stem Diameter - Intake 5.955-5.975 mm (0.2344-0.2352 in.)
Valve Stem-to-Guide Clearance - Exhaust 0.040-0.08 mm (0.0014-0.0030 in.)
Valve Stem-to-Guide Clearance - Intake 0.030-0.070 mm (0.0010-0.0026 in.)
Valve Lifter Diameter 11.986-12.000 mm (0.4720-0.4724 in.)
Valve Lifter-to-Bore Clearance 0.037-0.041 mm (0.0015-0.0016 in.)
Rocker Arms
Valve Rocker Arm Ratio 1.68 to 1
Valve Rocker Arm Roller Diameter 17.740-17.800 mm (0.6987-0.7008 in.)
Valve Springs
Valve Spring Coil Thickness 3.250 x 3.900 mm (0.1280 x 0.1535 in.)
Valve Spring Diameter - Inside Top 12.200-12.700 mm (0.4760-0.4957 in.)
Valve Spring Diameter - Outside Top 18.00-18.450 mm (0.7087-0.7264 in.)
Valve Spring Diameter - Inside Bottom 17.950-20.500 mm (0.7067-0.8071 in.)
Valve Spring Diameter - Outside Bottom 26.000 mm (1.0236 in.)
Valve Spring Free Length 42.500-45.500 mm (1.6555-1.7657 in.)
Valve Spring Installed Height - Closed 35.000 mm (1.3779 in.)
Valve Spring Installed Height - Open 24.000 mm (0.9449 in.)
NEW Cylinder Head Bolt - M8 Overhaul,
First Pass 15 Nm (10 lb ft.)
Final Pass 60 °
NEW Cylinder Head Bolt - M11
First Pass 45 Nm (33 lb ft.)
Second Pass Counter Clockwise 120 °
Third Pass 30 Nm (22 lb ft.)
Final Pass 150 °
Cylinder Head Core Hole Plug 45 Nm (33 lb ft.)
NEW Exhaust Manifold Bolt 20 Nm (15 lb ft.)
Service and Repair
Intake Manifold Service and Repair
Brace Bolt - Engine Front Cover M12 65 Nm (48 lb ft.)
Brace Bolt/Ball Stud - Intake Manifold M6 10 Nm (89 lb in.)
Engine Cover Ball Stud 9 Nm (80 lb in.)
Tuning Valve Bolt 10 Nm (89 lb in.)
Upper-to-Cylinder Head Bolt - Long 23 Nm (17 lb ft.)
Upper-to-Cylinder Head Bolt - Short 23 Nm (17 lb ft.)
Upper-to-Lower Intake Manifold Bolt 23 Nm (17 lb ft.)
Left:
Right:
Camshaft Cap Bolt 10 Nm (89 lb in.)
Overhaul, Right Side
Camshaft Position Actuator
Camshaft Bolt 58 Nm (43 lb ft.)
Camshaft Intermediate Drive Sprocket Bolt - Idler Sprocket 58 Nm (43 lb ft.)