| Illustration 1 | g02994596 |
Note: Apply engine oil to the threads of the cylinder head mounting bolts prior to assembly.
Note: Tighten the cylinder head mounting bolts in a numerical sequence to the proper torque.
| Tightening torque | Cylinder head mounting bolts | C2.6 - 147 to 156 N·m (108 to 115 lb ft) C3.3B - 187 to 196 N·m (138 to 144 lb ft) |
Selecting the Correct Cylinder Head Gasket
| Illustration 2 | g02994796 |
(1) Cylinder Head Gasket C3.3B | |
| Illustration 3 | g03250439 |
Cylinder Head Gasket C2.6 | |
- For C3.3B, make sure to note the notch (A), (B), or (C) of cylinder head gasket as shown in Illustration 4 in advance.
- For C2.6, make sure to note the holes (D), (E), or (F) of cylinder head gasket as shown in Illustration 5 in advance.
- Replace the same notch as the original cylinder head gasket.
| Illustration 4 | g02994830 |
| Illustration 5 | g03250458 |
- Select the cylinder head gasket thickness to meet with the top clearance when replacing the piston, piston pin bush, connecting rod or crankpin bearing.
- Measure the piston head protrusion or recessing from the crankcase cylinder face 4 spots per each piston and average of four pistons using a dial gauge.
| Illustration 6 | g02994916 |
| Illustration 7 | g02994917 |
- Select the suitable cylinder head gasket.
C2.6
| Notch of Cylinder Head Gasket | Thickness of cylinder head gasket | Piston Head protrusion or recessing from the level of crankcase cylinder face. (average of four pistons) | |
| Before tightening | After tightening | ||
| Without hole (D) | 1.10 mm (0.0433 inch) | 1.00 mm (0.0394 inch) | 0.250 to 0.350 mm (0.00984 to 0.01378 inch) |
| 1 hole (E) | 1.20 mm (0.04724 inch) |
1.10 mm (0.0433 inch) | 0.350 mm to 0.450 mm (0.01378 to 0.01772 inch) |
| 2 hole (F) | 1.30 mm (0.05118 inch) |
1.20 mm (0.04724 inch) |
0.450 to 0.550 mm (0.01772 to 0.02165 inch) |
C3.3B
| Notch of Cylinder Head Gasket | Thickness of cylinder head gasket | Piston Head protrusion or recessing from the level of crankcase cylinder face. (average of four pistons) | |
| Before tightening | After tightening | ||
| two notches (A) | 0.900 mm (0.0354 inch) | 0.800 mm (0.0315 inch) | 0.0775 to 0.150 mm (0.00306 to 0.00590 inch) |
| one notch (B) | 1.00 mm (0.0394 inch) | 0.900 mm (0.0354 inch) | 0.150 to 0.250 mm (0.00591 to 0.00984 inch) |
| Without notch (C) | 1.10 mm (0.0433 inch) | 1.00 mm (0.0394 inch) | 0.2500 to 0.3425 mm (0.009843 to 0.01348 inch) |
Top Clearance of Cylinder Head
- Remove the cylinder head
Note: Ensure that the head gasket is completely removed.
| Illustration 8 | g02995481 |
- Bring the piston to its top dead center, fasten fuse wires (Diameter 1.5 mm (0.059 inch.), long 5.0 to 7.0 mm (0.20 to 0.28 inch) 3 to 4 spots on the piston top with grease to avoid the intake and exhaust valves and the combustion chamber ports.
- Bring the piston to its middle position, install the cylinder head, and tighten the cylinder head screws to specification.
Note: The head gasket must be changed to a new one.
- Turn the crank shaft until the piston exceeds its top dead center.
- Remove the cylinder head, and measure squeezed fuse wires for thickness.
Table 4 Top clearance New 0.60 to 0.80 mm (0.024 to 0.031 inch)
| Illustration 9 | g02995520 |
(2) Fuse Wire | |
Cylinder Head Flatness
- Clean the cylinder head surface.
