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C3900955 XCMG GR2605 motor grader expansion plug

Part Number: C3900955 (A3900955, 3900955)

Alternate Names: Expansion Plug, Core Plug, Freeze Plug, Cup Plug, Dipstick Tube Plug

Material: Cold-Rolled Steel (Zinc-Plated)

Size: 10mm OD (Standard 10mm Cup Plug)

Structure: Shallow Cup Shape with Crimped Edge

Categories: XCMG Mining Graders Spare Parts

Product Details:

C3900955 XCMG GR2605 motor grader expansion plug

C3900955 (A3900955, 3900955) is a genuine Cummins steel cup expansion plug (core plug/freeze plug). It is a critical seal for engine block and dipstick tube oil holes. Made of cold-rolled steel with zinc plating, it seals machining ports and prevents coolant/oil leaks and contamination. Used with C3937736 filter, C3975818 cooler, D2830559 gasket in Cummins B-series engines.

Technical Parameters

Part Number: C3900955 (A3900955, 3900955)

Alternate Names: Expansion Plug, Core Plug, Freeze Plug, Cup Plug, Dipstick Tube Plug

Material: Cold-Rolled Steel (Zinc-Plated)

Size: 10mm OD (Standard 10mm Cup Plug)

Structure: Shallow Cup Shape with Crimped Edge

Temp Range: -40°C~130°C

Pressure Rating: ≤6bar (Coolant/Oil)

Finish: Zinc Plated (Corrosion Resistant)

Standards: Cummins OEM, ISO 9001, TS16949

Cross Reference: Universal 10mm Expansion Plug

Application

Applicable Engines:

Cummins: 4BT3.9, 6BT5.9, ISB5.9, ISB6.7, ISDE6.7, QSB5.9/6.7L
DCEC: ISBE, ISDE, 6BT Series

Equipment:

Commercial Vehicles: Dongfeng Tianlong, Tianjin, Foton Auman, FAW J6, Dodge Ram 5.9L
Construction: Komatsu PC200-7/8, Hitachi ZX230, LiuGong CLG925, XCMG XE250, Forklifts
Gensets: 80–160kW Cummins Diesel Units
Industrial: Air Compressors, Marine, Oilfield Machinery

Installation Location:

Primary: Driver’s Side Block, Dipstick Tube Hole (Near Oil Cooler/Filter Head)
Secondary: Block Side, Cylinder Head Machining Ports

Common Faults & Troubleshooting

1. Coolant Leakage

Causes: Rust-Through, Loose Fit, Freeze Crack, Aging
Symptoms: Seepage, Rust Stains, Low Coolant Level
Solution: Replace C3900955; Clean Bore, Inspect for Rust/Damage; Use Quality Antifreeze

2. Oil Leakage

Causes: Improper Installation, Debris, Damaged Edge, Distorted Bore
Symptoms: Oil Seepage Around Dipstick, Stains, Low Oil Level
Solution: Replace C3900955; Clean Bore, Remove Old Sealant; Proper Installation

3. Oil-Coolant Mixing

Causes: Plug Crack/Perforation, Misalignment, Damaged Bore
Symptoms: Milky Oil, Oil in Coolant, Abnormal Levels
Solution: Replace C3900955 Immediately; Check for Cavity Cross-Contamination; Flush Systems