Weichai America Corp.
35
connecting rod
5
Main bearing shell
10
Engine block
3.1.2 Pre-assembly Preparation
1.
Equipment condition: socket wrench, torque wrench, open spanner, hole ring pliers
2.
Preparation: attach the engine body to the rotating bracket, disassemble the cylinder head, oil
pan and other peripheral parts.
3.1.3 Disassembling Steps of Crank-Connecting Rod Mechanism
1.
With the engine crankcase upward, remove the main bearing bolts, and place them in order.
2.
Remove the crankshaft, flywheel and then the front/rear thrust washers and the bearing at
flywheel end. Take out the oil seal; place the crankshaft on the carrier (the crankshaft should
be vertically placed in case of long-time preservation).
3.
Place the removed parts as required.
3.1.4 Assembling Steps of Crank-Connecting Rod Mechanism
The assembly should be conducted in the reverse order of disassembly.
1.
Clean the main bearing bottom holes on cylinder block.
2.
Press the upper bearing into the bottom hole of the cylinder block, and wipe away the foreign
matters scraped from the bearing port.
1)
The upper bearing should be checked for scratches strictly before press-fitting, and the
scratched one should not be reused.
2)
The upper bearing bush should be aligned with the oil hole and oil groove on the cylinder
block after installation, and any deviation above 1/5-1/4 of the oil hole is not allowed; the
upper bearing should fit well with the main bearing bottom hole on the cylinder block.
3.
Apply appropriate clean lubricating oil to the inside of main bearing.
4.
Wipe the oil off the lower surface of engine block.
5.
Apply sealant evenly on the lower surface of engine body with rubber roller.
6.
Lift the crankshaft, blow the oil duct hole with compressed air, wipe the main bearing journal
and connecting rod journal with a towel, and place them into the cylinder block gently,
preventing the crankshaft from being scratched.
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