2014/12/12 Caterpillar

A New Torque Value for the Flywheel Group Is Used on Certain C18 Engines {1156}

Usage:

C18 C6C

Engine: C-18 (S/N: JZB1-UP)
Generator Set: C18 (S/N: LNB1-UP; LZB1-UP; C6C1-UP; G4C1-UP; N1C1-UP; L8D1-UP; N1D1-UP; STD1-UP; DKE1-UP; LXK1-UP; STM1-UP; EKW1-UP; M1Y1-UP; M1Z1-UP)

Description of Change: An improved assembly process for the installation of the flywheel reduces crankshaft journal lobing.

The new process uses a reduced torque for the flywheel mounting bolts.

The old torque was 100 ± 5 N·m (75 ± 4 lb ft). Next, turn the bolt by an additional 90 ± 5 degrees.

The new torque is 270 ± 40 N·m (200 ± 30 lb ft) with no additional turning of the bolt.

Note: Use the new torque when replacing the rear crankshaft seal as well as anytime the flywheel is installed.

ReferenceRefer to Disassembly and Assembly, "Flywheel - Remove and Install"

Adaptable To: The new torque is adaptable back to first production on the serial numbers listed above. The change is effective for the serial numbers listed in Table 1.

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Table 1
Effective Serial Numbers
S/N:C6C00734-UP
S/N:DKE00558-UP
S/N:EKW01678-UP
S/N:G4C04927-UP
S/N:JZB01519-UP
S/N:LNB01178-UP
S/N:L8D00404-UP
S/N:LXK00810-UP
S/N:LZB00133-UP
S/N:M1Y00300-UP
S/N:M1Z01922-UP
S/N:N1C00546-UP
S/N:N1D00941-UP
S/N:STD00230-UP
S/N:STM01777-UP