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Mitsubishi S12 diesel engine with front unit


Detailed Description:

Mitsubishi S12 diesel engine with front unit

3.1 Installing the coupling (Tachometer configuration specifications)

(1) Install the coupling after aligning the positioning pin at the front end of the camshaft of the Mitsubishi S12 diesel engine, and tighten the bolts.

(2) Install the oil seal and O-ring of Mitsubishi S12 diesel engine into the oil seal seat of Mitsubishi S12 diesel engine and tighten the bolts.

Note: (a) Apply grease to the oil seal lip and O-ring of Mitsubishi S12 diesel engine. (b) Install the Mitsubishi S12 diesel engine camshaft before installing the coupling, Mitsubishi S12 diesel engine oil seal, and Mitsubishi S12 diesel engine oil seal seat.

3.2 Installing the front plate

(1) Apply sealant (ThreeBond 1211) to the front gearbox gasket mounting surface of the Mitsubishi S12 diesel engine cylinder block and attach the gasket.

(2) Apply sealant (ThreeBond 1211) to the gasket and install the front plate.

(3) Tighten the bolts to the specified torque.

(4) Confirm that the lower part of the front plate is flush with the bottom of the Mitsubishi S12 diesel engine block. Carefully cut off the edges of the gaskets that are exposed.

3.3 Install the front Mitsubishi S12 diesel engine idler shaft

(1) Install the front Mitsubishi S12 diesel engine idler shaft on the Mitsubishi S12 diesel engine block.

(2) Tighten the bolts to the specified torque.

3.4 Install front idler gear

(1) Apply lubricant to the idler shaft of Mitsubishi S12 diesel engine.

(2) Install the front idler gear.

(3) Install the thrust plate of Mitsubishi S12 diesel engine and tighten the bolts according to the specified torque.

3.5 Measure the backlash of the front idler gear

Measure the backlash of the front idler gear, place the dial indicator on the circumference of the gear pitch circle, make vertical contact with the tooth surface, measure the amount of backlash, or insert a thickness gauge in the meshing part of each gear to measure. Replace the new gear when the limit is exceeded.

3.6 Measure the axial clearance of the front idler gear

Measure the axial clearance of the front idler gear. When the limit is exceeded, replace the thrust plate or idler gear of the Mitsubishi S12 diesel engine with a new one.

3.7 Installing Mitsubishi S12 Diesel Engine Water Pump Bearing End Caps and Mitsubishi S12 Diesel Engine Oil Pump Bearing End Caps

(1) Install the oil seal of the Mitsubishi S12 diesel engine in the bearing cap of the pump of the Mitsubishi S12 diesel engine.

(2) Install the Mitsubishi S12 diesel engine water pump bearing end cap and Mitsubishi S12 diesel engine lubricant pump bearing end cap on the front plate.

(3) Tighten the bolts to the specified torque.

3.8 Install the water pipe connection sleeve

(1) Apply grease to the O-ring and O-ring groove.

(2) Install the water pipe connection sleeve of the cylinder block and gearbox of Mitsubishi S12 diesel engine, taking care not to damage the O-ring.

3.9 Install Mitsubishi S12 Diesel Engine Fan Drive Idler Gear and Mitsubishi S12 Diesel Engine Fan Drive Mitsubishi S12 Diesel Engine Idle Gear Shaft (Mitsubishi S12 Diesel Engine Fan Configuration Specifications)

(1) The pin gear of the fan drive idler gear of the Mitsubishi S12 diesel engine faces toward the side, and is inserted into the mounting hole of the fan drive of the Mitsubishi S12 diesel engine. Support the idler gear of the Mitsubishi S12 diesel engine fan drive by hand, so that it and the Mitsubishi S12 diesel engine fan The center of the idler shaft of the driver Mitsubishi S12 diesel engine is aligned.

(2) Insert the Mitsubishi S12 diesel engine fan driver Mitsubishi S12 diesel engine idler shaft into the Mitsubishi S12 diesel engine fan driver idler gear.

(3) Tighten the mounting bolts of the gearbox flange to the specified torque.

3.10 Measure backlash of idler gear of Mitsubishi S12 diesel engine fan driver (Mitsubishi S12 diesel engine fan configuration specifications)

Measure the backlash of the idler gear of the fan driver of the Mitsubishi S12 diesel engine. Place the dial indicator on the circumference of the gear pitch circle and make vertical contact with the tooth surface. Gauge for measurement. Replace the new gear when the limit is exceeded.

3.11 Measure the axial clearance of the idler gear of the Mitsubishi S12 diesel engine fan driver (Mitsubishi S12 diesel engine fan configuration specifications)

Measure the axial clearance of the idler gear of the Mitsubishi S12 diesel engine fan driver. When the limit value is exceeded, identify the faulty part and replace it.

3.12 Installing the front gearbox

(1) Apply sealant (ThreeBond 1211) to the front gearbox gasket mounting surface of the Mitsubishi S12 diesel engine cylinder block and attach the gasket. Apply sealant (ThreeBond 1211) to the gasket and install the front gearbox.

(2) Tighten the bolts to the specified torque.

(3) Check whether the bottom of the front gearbox is flush with the bottom of the Mitsubishi S12 diesel engine cylinder. Carefully cut off the edges of the gaskets that are exposed.

3.13 Install front side Mitsubishi S12 diesel engine oil seal

Use the front Mitsubishi S12 diesel engine oil seal installation tool to install the front Mitsubishi S12 diesel engine oil seal.

(1) Apply clean lubricant to the lips of the oil seal of the Mitsubishi S12 diesel engine.

Note: When installing the Mitsubishi S12 diesel engine oil seal, pay attention to the direction in which the Mitsubishi S12 diesel engine oil is packed, and be careful not to damage the Mitsubishi S12 diesel engine oil seal.

(2) Install a guide flange on the front end of the crankshaft of Mitsubishi S12 diesel engine and fix it with bolts.

(3) Enclose the Mitsubishi S12 diesel engine oil in the mounter and insert the guide flange.

(4) Tighten the bolts on the guide flange to seal the Mitsubishi S12 diesel engine oil into the front cover.

(5) Remove the installer assembly.

3.14 Install Mitsubishi S12 Diesel Engine Lubricant Pump Gear and Pump Seat Plate (For Mitsubishi S12 Diesel Engine Water Pump, Mitsubishi S12 Diesel Engine Lube Oil Pump)

(1) Install the bearing in the gear of the Mitsubishi S12 diesel engine lubricant pump.

(2) Insert the Mitsubishi S12 diesel engine lubricant pump.

(3) Install the pump seat plate on the front gearbox.

(4) Tighten the bolts to the specified torque.

3.15 Install the respirator housing (without Mitsubishi S12 diesel engine fan specifications)

Install the respirator housing on the front gearbox.

3.16 Installing Mitsubishi S12 Diesel Engine Shock Absorber and Mitsubishi S12 Diesel Engine Crankshaft Pulley

(1) Install guide bolts in the Mitsubishi S12 diesel engine shock absorber mounting screw holes of the Mitsubishi S12 diesel engine crankshaft.

(2) In accordance with the order of the bulkhead, the inner Mitsubishi S12 diesel engine shock absorber, the bulkhead, the outer Mitsubishi S12 diesel engine shock absorber, and the Mitsubishi S12 diesel engine crankshaft pulley, install them with the guide bolts and alignment pins.

(3) Tighten the bolts to the specified torque.

Note: When installing, pay attention not to install the Mitsubishi S12 diesel engine shock absorber in the correct position and orientation.

3.17 Measure end face runout and radial runout of Mitsubishi S12 diesel engine shock absorber

Measure end face runout and radial runout of Mitsubishi S12 diesel engine shock absorbers.

When it exceeds the standard value, check the tightening condition of the bolts, and the mounting state of the mounting surface for foreign matter adhesion.

Note: The measurement position should avoid the marking position.

3.18 Installing and adjusting the pointer

(1) Mount the pointer on the front gear box.

(2) The crankshaft of Mitsubishi S12 diesel engine is placed at No.1 dead center on the cylinder of No.1 Mitsubishi S12 diesel engine, so that the No.1 Mitsubishi S12 diesel engine on the periphery of the shock absorber of Mitsubishi S12 diesel engine has the same marking and pointer on the cylinder .

(3) No.1 The method for confirming the dead point on the cylinder of Mitsubishi S12 diesel engine is to mark the end of the flywheel of Mitsubishi S12 diesel engine and the timing gearbox of Mitsubishi S12 diesel engine with a dot mark. At the same time, it is the top dead center of No.1 Mitsubishi S12 diesel engine cylinder.

Note: For the method of confirming the top dead point by the piston operation of Mitsubishi S12 diesel engine, refer to the item "Detect the protrusion of Mitsubishi S12 diesel engine piston" in "Assembly of Mitsubishi S12 diesel engine body".

4. Install the rear unit

4.1 Installing the back plate

(1) Install the nozzle seat plate.

(2) Apply sealant (ThreeBond 1211) to the gasket mounting surface of the rear plate of the Mitsubishi S12 diesel engine cylinder block, and attach the gasket.

(3) Apply sealant (ThreeBond 1211) to the gasket and install the rear plate.

(4) Tighten the bolts to the specified torque.

(5) Confirm that the lower part of the rear plate is flush with the bottom of the Mitsubishi S12 diesel engine block. Carefully cut off the edges of the gaskets that are exposed.

4.2 After the Mitsubishi S12 diesel engine is installed, the Mitsubishi S12 diesel engine idler shaft

After the O-ring is installed in the Mitsubishi S12 diesel engine, the Mitsubishi S12 diesel engine idler shaft is coated with grease on the O-ring part. Mitsubishi S12 diesel engine After the Mitsubishi S12 diesel engine, the idler gear shaft is aligned with the dowel pin and installed on the cylinder of the Mitsubishi S12 diesel engine.

4.3 Installing Mitsubishi S12 Diesel Engine Camshaft

Mitsubishi S12 diesel engine from the side detection port of the cylinder block with a rod against the camshaft of Mitsubishi S12 diesel engine while installing. After the Mitsubishi S12 diesel engine camshaft collides, the cam and the Mitsubishi S12 diesel engine camshaft bushing will be damaged.

(1) Apply grease to the inner surface of the cam bush.

(2) Apply lubricating oil to the oil hole area, journal position and cam of Mitsubishi S12 diesel engine camshaft.

(3) Hold the Mitsubishi S12 diesel engine camshaft with a rod or the like at the cylinder block of the Mitsubishi S12 diesel engine while carefully inserting the Mitsubishi S12 diesel engine camshaft.

(4) Tighten the fixing bolts of the thrust plate of the Mitsubishi S12 diesel engine.

(5) Confirm that the camshaft of the Mitsubishi S12 diesel engine rotates.

4.4 Installing Mitsubishi S12 Diesel Engine Camshaft Gear

(1) Align the positioning pin of the camshaft gear of the Mitsubishi S12 diesel engine and the camshaft of the Mitsubishi S12 diesel engine and install it.

(2) Tighten the bolts to the specified torque.

(3) Confirm that the crankshaft of Mitsubishi S12 diesel engine can rotate easily.

4.5 Measure axial clearance of camshaft of Mitsubishi S12 diesel engine

Measure the axial clearance of the camshaft of the Mitsubishi S12 diesel engine. When the limit value is exceeded, identify the faulty part and replace it.

4.6 Installing Mitsubishi S12 Diesel Engine Fuel Injection Pump Driver

(1) Install an O-ring on the mounting surface of the fuel injection pump driver housing of the Mitsubishi S12 diesel engine. Apply a thin layer of sealant (ThreeBond 1212) on the flange surface.

(2) Install the fuel injection pump driver of the Mitsubishi S12 diesel engine on the rear plate.

(3) Tighten the bolts to the specified torque.

4.7 Installing Mitsubishi S12 Diesel Engine Rear Idling Gear

(1) Turn the crankshaft of the Mitsubishi S12 diesel engine to the top dead center position of No.1 Mitsubishi S12 diesel engine cylinder.

(2) Apply lubricant to the idler shaft of Mitsubishi S12 diesel engine.

(3) Install the idle gear after aligning the assembly mark.

(4) Install the thrust plate of Mitsubishi S12 diesel engine on the idler shaft of Mitsubishi S12 diesel engine.

(5) Tighten the bolts to the specified torque.

(6) Confirm that the installation symbols of the timing gear of the Mitsubishi S12 diesel engine are consistent with the drawings.

4.8 Measure the axial clearance of the rear idler gear of Mitsubishi S12 diesel engine

Measure the axial clearance of the rear idler gear of the Mitsubishi S12 diesel engine. When the limit is exceeded, replace the thrust plate or idler gear of the Mitsubishi S12 diesel engine with a new one.

4.9 Measuring Backlash of Timing Gear of Mitsubishi S12 Diesel Engine

Measure the backlash of the timing gear of the Mitsubishi S12 diesel engine. Place the dial indicator on the circumference of the gear pitch circle, and make vertical contact with the tooth surface. Take measurements. Replace the new gear when the limit is exceeded.

Test items

standard value

Limit value

Backlash of Mitsubishi S12 diesel engine crank gear and rear idler gear of Mitsubishi S12 diesel engine

0.11 to 0.28 mm

0.50 mm

Backlash of idler gear and camshaft gear of Mitsubishi S12 diesel engine

0.12 to 0.18 mm

0.50 mm

Backlash of idler gear and Mitsubishi S12 diesel engine fuel injection pump gear

0.12 to 0.18 mm

0.50 mm

4.10 Installing Timing Gearbox of Mitsubishi S12 Diesel Engine

Be careful not to drop or bump the timing gearbox of the Mitsubishi S12 diesel engine. Not only will it damage the timing gearbox of the Mitsubishi S12 diesel engine, it may also cause a personal accident.

(1) Apply sealant (ThreeBond 1211) to the gasket mounting surface of the rear plate and attach the gasket.

(2) Apply sealant (ThreeBond 1211) to the mounting surface of the Mitsubishi S12 diesel engine timing gearbox.

(3) Install a spreader on the timing gearbox of the Mitsubishi S12 diesel engine. After aligning the positioning pins, install the timing gearbox of the Mitsubishi S12 diesel engine.

(4) Tighten the bolts to the specified torque.

(5) Carefully cut off the gasket edges exposed at the bottom of the Mitsubishi S12 diesel engine block.

4.11 After installing Mitsubishi S12 diesel engine Mitsubishi S12 diesel engine Mitsubishi S12 diesel engine idle gear shaft Mitsubishi S12 diesel engine thrust sleeve

(1) Mitsubishi S12 diesel engine Mitsubishi S12 diesel engine Mitsubishi S12 diesel engine idle gear shaft Mitsubishi S12 diesel engine thrust sleeve is coated with grease, and inserted into the Mitsubishi S12 diesel engine block. At this time, pay attention to the assembly mark "TOP" at the top. In addition, install it in accordance with the identification mark made during removal.

(2) Tighten the nut with the specified torque.

(3) Install a cover on the timing gearbox of the Mitsubishi S12 diesel engine.

4.12 Installing the oil seal on the rear Mitsubishi S12 diesel engine

Installation of the rear M12 Mitsubishi S12 diesel engine oil seal is performed using the rear Mitsubishi S12 diesel engine oil seal installation tool.

(1) Apply clean lubricant to the lips of the oil seal of the Mitsubishi S12 diesel engine.

Note: When installing the Mitsubishi S12 diesel engine oil seal, pay attention to the direction in which the Mitsubishi S12 diesel engine oil is packed, and be careful not to damage the Mitsubishi S12 diesel engine oil seal.

(2) Install a guide flange on the rear end of the crankshaft of Mitsubishi S12 diesel engine and fix it with bolts.

(3) Enclose the Mitsubishi S12 diesel engine oil in the mounter and insert the guide flange.

(4) Tighten the bolts on the guide flange to encapsulate the Mitsubishi S12 diesel engine oil into the Mitsubishi S12 diesel engine timing gear box.

(5) Remove the installer assembly.

4.13 Installing Mitsubishi S12 Diesel Engine Flywheel

(1) Confirm that the mounting surface of the Mitsubishi S12 diesel engine flywheel and the Mitsubishi S12 diesel engine crankshaft are free of foreign objects or damage.

(2) Install a spreader on the Mitsubishi S12 diesel engine flywheel.

(3) Align the Mitsubishi S12 diesel engine flywheel with the positioning pin on the crankshaft of the Mitsubishi S12 diesel engine and install it.

(4) Apply lubricating oil to the thread and seat surface of the bolts and tighten them to the specified torque.

4.14 Installing Mitsubishi S12 Diesel Engine Governor Driver (Specifications of Hydraulic Mitsubishi S12 Diesel Engine Governor)

(1) Install an O-ring on the driver of the Mitsubishi S12 diesel engine governor.

(2) Install the Mitsubishi S12 diesel engine governor driver on the rear plate.

(3) Tighten the bolts to the specified torque.

4.15 Measure end face runout and radial runout of Mitsubishi S12 diesel engine flywheel

Measure end face runout and radial runout of Mitsubishi S12 diesel engine flywheel. When it exceeds the standard value, check the tightening condition of the bolts, and the mounting state of the mounting surface for foreign matter adhesion.

4.16 Installing Mitsubishi S12 Diesel Engine Speed Sensor

(1) Rotate the crankshaft of the Mitsubishi S12 diesel engine so that the tooth end of the ring gear is placed at the center of the mounting hole of the speed sensor of the Mitsubishi S12 diesel engine.

(2) Screw the Mitsubishi S12 diesel engine speed sensor into the mounting hole by hand.

(3) After the end of the speed sensor of the Mitsubishi S12 diesel engine contacts the tooth end of the ring gear, unscrew the speed sensor of the Mitsubishi S12 diesel engine so that the gap between the end of the speed sensor of the ring gear and the tooth end of the ring gear is within the standard value.

(4) Fix the Mitsubishi S12 diesel engine speed sensor with a lock nut.

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