GXH50 Engine Assembly Information

PISTON SIDE COVER/GOVERNOR / TOP RING SECOND RING RINGS CRANKCASE SIDE COVER 17 x 27 x 5 mm OIL SEAL RECOIL PULLEY MARK 5 x 23 (6) FLYWHEEL 10 mm SPECIAL NUT REASSEMBLY: REMOVAL: 7.5 N·m (0.75 kgf·m, 5.4 lbf·ft) INSTALLATION: REASSEMBLY: ・Do not interchange the top Insert a screw REASSEMBLY: Be sure that there is no washer Apply oil to the threads and seat ring and the second ring. driver or equivalent Tighten diagonally in 2 or 3 steps to the or other foreign material on the surface of the nut, and tighten the nut. ・After assembly, check for tool into the OIL RING SIDE RAIL specified torque. magnetic part. 21.5 N·m (2.15 kgf·m, 15.5 lbf·ft) 10 mm smooth movement of the concave in the (COMBINATION (0.4 in) SPACER piston ring. position shown, GOVERNOR WEIGHT HOLDER RING) SIDE RAIL WOODRUFF KEY COVER STUD BOLT A ・Stagger the piston ring end and remove the REASSEMBLY: Check to see 10 mm (0.4 in) REASSEMBLY: 8.0 N·m (0.8 kgf·m, 5.8 lbf·ft) △ MARK gaps 120° apart. Do not crankcase side 4.2 mm whether the weight opens smoothly. align with the piston pin. cover. WASHER (2) After installing the flywheel, 5 x 20 PISTON PIN CLIP (2) check the key groove to see PISTON TOP RING (WHITE 6 x 10 mm GOVERNOR HOLDER CLIP IGNITION COIL REASSEMBLY: whether the key is set properly. PIN CIRCUMFERENCE) DOWEL PIN (2) REASSEMBLY: Be sure to set the ・ Install by setting one end clip in the groove in the shaft. of the clip in the piston CONNECTING FAN COVER STUD BOLT B (2) STOP SWITCH WIRE groove, holding the other GOVERNOR SLIDER ROD 8.0 N·m (0.8 kgf·m, 5.8 lbf·ft) (With oil alert type only) end with long-nosed REASSEMBLY: HIGH TENSION WIRE pliers, and rotating the PISTON Open the governor ALIGNMENT OIL RING REASSEMBLY: clip in. weight and insert the REASSEMBLY: MARK (COMBINATION RING) Clean the tapered part of dirt, ・Do not align the end gap slider into the shaft. Check the insulator of the of the clip with the cutout SECOND RING (BLACK oil, grease and all foreign wire for tears and damage in the piston pin . CIRCUMFERENCE) material before installation. before connection. BREATHER TUBESHROUD 5 x 12

OIL CASE/CRANKSHAFT//VALVE LIFTER VALVE/ BLOCK//PUSH ROD OIL DRAIN BOLT OIL FILLER CAP 17 x 27 x 5 mm OIL CASE INSTALLATION VALVE SPRING RETAINER (2) VALVE SPRING (2) 11 N·m (1.1 kgf·m, 8 lbf·ft) OIL SEAL CRANKCASE COVER, CRANKSHAFT,・Apply a bead 1.5 to 2.0 PISTON mm (0.06 ・Loosely tighten the bolts, REASSEMBLY: VALVE STEM SEAL (IN SIDE ONLY) PACKING then tighten them to the 5 x 23 (8) OIL CASE to 0.08 in) in diameter of ⑦ ② ④ Install the valve CYLINDER INLET VALVE specified torque in the ① REASSEMBLY: liquid (ThreeBond 1216E spring retainer BLOCK REASSEMBLY: numbered sequence Tighten diagonally or equivalent) to the mating while holding the ・Remove carbon deposits before surface of the cylinder block shown. ⑤⑥valve with the in 2 or 3 steps to LIQUID GASKET installation. as shown. TORQUE: 7.5 N·m the specified APPLICATION handle of a driver ・Check the valve head for damage. ・ (0.75 kgf·m, 5.4 lbf·ft) torque. 7.5 N·m Assemble within 3 minutes AREA or hammer. ・Do not interchange with the exhaust ・Wait for 30 minutes after (0.75 kgf·m, after applying the liquid gasket. valve. ・ assembly. Do not add oil VALVE GUIDE 5.4 lbf·ft) If it is hard to install the oil case VALVE HEAD DIAMETER: or start the engine during properly, install by turning the ③ ⑧ EXHAUST VALVE IN: 17.5 mm EX: 15.5 mm this period. SEALING WASHER crankshaft a little. CYLINDER BLOCK REASSEMBLY: ・Remove carbon deposits 5 x 22 (4) PISTON/CONNECTING CAMSHAFT VALVE VALVE CAMSHAFT INSTALLATION before installation. FUEL OIL OUTLET VALVE REASSEMBLY: ROD ASSEMBLY ROLLER LIFTER LIFTER (2) ( ALIGNMENT) ・Check the valve head for TANK O-RING Tighten the bolts COLLAR damage. STAY (REPLACE) INSTALLATION: diagonally in 2 or 3 OIL LEVEL ・Install with the "△" mark on CAMSHAFT steps. 6.0 N·m the head toward the IN side. SWITCH CRANKSHAFT CAMSHAFT VALVE COVER (0.6 kgf·m, 4.3 lbf·ft) 5 x 14 (3) ・Take care not to break the PUSH ROD (2) U16FSR-UB OIL DIPPER CONNECTING 3 x 5 mm piston ring during installation. REASSEMBLY: (DENSO) VALVE ROCKER ARM (2) ROD CAP SCREW Check for wear or deformation at both CR5HSB INSTALLATION: LIFTER ALIGNMENT ends of the push rod. Install by aligning LOCK NUT (2) 5.5 N·m (NGK) Install with the dipper STOPPER ROLLER MARK with the adjustment screw and the (0.55 kgf·m, 4.0 lbf·ft) part toward up. PLATE △ MARK concave in the valve lifter securely. MARK BOLT (2) PUSH ROD ADJUSTING 6.0 N·m (0.6 kgf·m, 4.3 lbf·ft) SCREW (2) CONCAVE CAMSHAFT 8 mm LOCK PIN CAMSHAFT ROCKER ARM CYLINDER DRIVE GEAR DRIVE GEAR VALVE LIFTER SHAFT INSTALLATION: ALIGNMENT BLOCK Install by aligning the MARKS straight part with the CRANKCASE SIDE COVER INSTALLATION CYLINDER VALVE COVER INSTALLATION groove in the arm shaft. ・Apply a bead 1.5 to 2.0 mm (0.06 to 0.08 in) BLOCK ・Apply a bead 1.5 to 2.0 mm (0.06 to 0.08 in) OIL DIPPER in diameter of the liquid gasket (ThreeBond in diameter of the liquid gasket (ThreeBond ・Install by aligning the alignment 1216E or equivalent) to the mating surface 1207B or equivalent) to the position shown CYLINDER LIQUID GASKET 5 x 11 x 5 mm OIL SEAL LIQUID GASKET marks on the connecting rod of the cylinder block as shown. on the cylinder block. BLOCK APPLICATION 6 x 15 mm DOWEL ・ APPLICATION ・ AREA 5.2 x 9 mm WASHER big end and on the cap. Assemble within 3 minutes after applying Assemble within 3 minutes after applying PIN (2) the liquid gasket. AREA the liquid gasket. INSTALLATION: ・Install with the oil dipper facing CYLINDER BLOCK ・Wait for 30 minutes after assembly. Do not ・Wait for 20 minutes after assembly. Do not Install inside the cylinder block. the flywheel installation side. GOVERNOR ARM SHAFT add oil or start the engine during this period. add oil or start the engine during this period.

See the shop manual for additional information. © Honda Motor Co., Ltd. 2010