Category Archives: FUSO 4M4

Installation: Flywheel • Tighten the flywheel mounting bolts to a torque of 39 N·m {4.0 kgf·m}. • After installing, give the bolts a further 30° turn clockwise to tighten up, then provide a punch mark on the head of each bolt to indicate the number of times of its use. •Installation: Washer Install the washer… Read More »

Inspection: Wear of the ring gear [Inspection] • If the measurement exceeds the limit, replace the ring gear. Replacement of the ring gear [Removal] • Heat the ring gear evenly with a gas burner or the like until it reaches approximately 200°C, then remove it from the flywheel. [Installation] • Heat the ring gear evenly… Read More »

•Inspection: Flywheel friction surface runout If the runout exceeds the specified limit, check that the bolts are tightened correctly and that there are no abnormalities on the crankshaft mounting surface, then rectify or replace the flywheel.  

Disassembly sequence 1 Washer 2 Pilot bearing 3 Ring gear 4 Flywheel Locating pin • Do not remove the pilot bearing and ring gear unless defects are evident. Assembly sequence Follow the disassembly sequence in reverse. • Make sure that there are no foreign substances, oil and other harmful flaws on the flywheel mounting surface.… Read More »

Installation: Connecting rod bolts • Check that there are no burrs or other defects on the surface of the connecting rod bolt holes. Replace the connecting rod if defects are evident. • Apply engine oil to the knurled surface of the connecting rod bolt. Then, install the bolt by using a press to apply a… Read More »

•Inspection: Piston ring end gap – Using the crown of a piston, push the piston ring horizontally into a cylinder in the crankcase until it reaches the lower part of the cylinder, where there is relatively small wear. – Taking care not to move the piston ring, measure the end gap. – If any of… Read More »

• Removal: Piston ring • Removal: Piston pin Remove the piston pin by striking it with a rod and hammer. If the piston pin is difficult to remove, first heat the piston in hot water or with a piston heater.  

Installation: Connecting rod bearings • Select and use a bearing set of a thickness that can accommodate the inside diameter of the connecting rod’s large end and the diameter of the crankshaft pin. Use either of the following methods for the selection. (1) Measurement based selection • Install the connecting rod cap on the piston… Read More »