3 minute read
Hou8:!n2 cover
TBMING GEARS
30. Camshaft gear removal requires remo\al of camshaft. Refer to paragraph 33 for removal procedure. With camshaft removed, press gear off the camshaft towards the rear. When installing a gear on the camshaft, be sure that front face of gear is seated against rear face of camshaft front shoulder. 31. The distributor drive gear (2— Fig. A8) on the front of the camshaft is not a replaceable item. The camshaft and distributor drive gear are furnished as a unit. 32. Crankshaft gear is a tight press fit on the crankshaft. To remove this gear ii; is necessary to either remove the frame front cross member or the engine.
Fig. A7—Front view of engine showing cover cap Ecrew (1) behind governor, governor shait rear bearing (7) on model V and screw (3) for internally ad'iusting end play of camshaft.
Due to the extremely tight fit of is controlled by an adjustable fibre this gear it is almost impossible to pull tipped screw (3—Fig. A7) in timing it from the crankshaft with any of the gear cover. To obtain correct end play, commercial pullers. If a suitable arbor turn screw in until it just contacts press is not available or if it is dethrust button in shaft then back-out sired to remove the gear without reVs turn. moving the shaft from the engine, Hercules recommends splitting the gear after first drilling through with a V4 inch drill midway between the edge of the keyway and the base of the teeth, A mild application of heat on the crankshaft gear of 450 °F. or when 34A. PERTINENT DATA. Pertinent data applying to camshaft and bearings are tabulated below: Shaft Running Clearance 0.0015-0.0025 Preferred Running Clearance... .0.002 Journal Diameter (A-BF-BG-R) 1.5955 gear turns a pale straw yellow will Journal Diameter (V) 1.2625 facilitate its reinstallation. Crankshaft Number of Bearings 4 gear backlash should be 0.000 to 0.002. R & R OF ROD & PISTON UNITS
CAMSHAFT AND BEARINGS 35. Connecting rod and piston assemblies are removable from above af33. To remove the camshaft, remove ter removing cylinder head and oil oil pan and oil pump, governor aspan. Connecting rods are numbered on sembly and timing gear cover. With the camshaft side. Aluminum pistons valve tappets held up by nails as in engines which rotate clockwise shown in Fig. A9, withdraw camshaft should be installed with the split or from front of engine. On models A, "T" slot on the side opposite the camBF and R, it is necessary to remove shaft. the steering housing (pedestal) or the engine to permit removal of the camPISTONS AND SLEEVES shaft. 36. Trunk type cast iron pistons with bronze bushed piston pin bosses
Reassembly is reverse of disassemare used in model V tractors equipped bly. Be sure bronze thrust washer is with the Hercules ZX engines and installed on camshaft between camsome of the IX series engines used in shaft gear and cylinder block. model A tractors. Split skirt aluminum 34. Camshaft bearings can be driven pistons are also supplied for the enout and renewed. New bearings do not gines in the model A tractor and are require final sizing if installed careregular equipment for BF, BG & R fully. Clearance of camshaft in the tractors. Pistons for unsleeved engines bearings should be 0.0015 to 0.0025. are supplied in Standard, 0.020, 0.040 Oil leakage from camshaft rear bearing is prevented by the gasket installed between the cylinder block and fiywheel housing. Camshaft end play and 0.060 inch oversize. When checking iron or aluminum pistons for clearance, use a ^ inch wide feeler ribbon of 0.003 thickness. Pistons should have a slight drag (3 to 7 pounds) when pushed through the cylinder past feeler ribbon. On all clockwise-rotating engines the split or "T" slot in aluminum pistons should be installed on the side opposite the camshaft. 37. The Hercules IXB-3SL engines are equipped with dry type cylinder sleeves. Because these sleeves are installed with a tight press fit, their removal calls for the use of a sleeve puller and pusher. Sleeves should be coated with white lead mixed with oil before pressing into place. After sleeve
