Piston Seizures on C18 Engines{1225, 1331} Caterpillar

Piston Seizures on C18 Engines{1225, 1331}

Usage:

657G A4G

Cold Planer:: PM-200 (S/N: P1C1-UP); PM-201 (S/N: PNM1-UP); PM200 (S/N: P1M1-UP)
Landfill Compactor:: 836H (S/N: BXD1-UP)
Engine:: C-18 (S/N: MDP1-UP); C18 (S/N: EJG1-UP)
Generator Set:: C18 (S/N: C6C1-UP; G4C1-UP; DKE1-UP; EKW1-UP; CYN1-UP; DCT1-UP)
Marine Engine:: C18 (S/N: CKH1-UP; C1J1-UP)
Excavator:: 385C (S/N: EDA1-UP; MMA1-UP; KGB1-UP; KBC1-UP; SBE1-UP; T2E1-UP; T2F1-UP; KKK1-UP; EAM1-UP; JCM1-UP; WAW1-UP; MNZ1-UP); 390D (S/N: WAG1-UP; WAP1-UP)
Motor Grader:: 24M (S/N: B9K1-UP)
Mobile Hydraulic Power Unit:: 385C MHPU (S/N: MSF1-UP)
Off-Highway Truck/Tractor:: 772 (S/N: RLB1-UP)
Track-Type Tractor:: D9T (S/N: RJS1-UP)
Underground Articulated Truck:: AD45B (S/N: CXM1-UP); AD55 (S/N: DNW1-UP)
Wheel Dozer:: 834H (S/N: BTX1-UP)
Wheel Loader:: 988H (S/N: BXY1-UP)
Wheel Tractor-Scraper:: 631G (S/N: DFA1-UP); 637G (S/N: DFJ1-UP); 657G (S/N: W1B1-UP; W1C1-UP; A4G1-UP; GER1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

There have been reports of piston seizures on C18 Engines with no apparent root cause. A failure mode of debris that is clogging the piston cooling jets has been identified.

Solution

If an engine is being repaired for a piston seizure all the piston cooling jets must be removed and the piston cooling jets must be inspected. Run a piece of wire that is the appropriate size through the piston cooling jet in order to dislodge any possible debris before reinstalling the piston cooling jet.

Note: The piston cooling jet that is removed from the cylinder with the seizure must be replaced.

Refer to Illustration 1 for an example of the debris in the piston cooling jet. Refer to Illustration 2 for an example of the size of the debris that is needed to clog the piston cooling jet.

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