Prevent catastrophic coolant loss and maintain internal casting pressure with our Premium 20450778 Engine Block Expansion Plug Cores for VOLVO EC210B, EC240B, and EC300D excavators. Get direct factory pricing, bulk B2B discounts, and fast global air express shipping from China's leading powertrain components supplier today!
Lock In Coolant Pressure, Prevent Casting Crack Ruin. Corroded or loose plug causes coolant leakage and sharp pressure loss, easily leading to engine overheating and cylinder block cracking. This hardened expansion plug tightly seals cooling channels, protecting D4D/D6D/D6E/D7E engine cooling system safely.
High-strength Thick Steel Plate Rigid structure, effectively resist coolant pressure impact and avoid popping failure.
Anti-rust Electroplated Coating Inhibit corrosion and scale erosion, adapt long-term glycol coolant immersion environment.
Precision Taper Press-fit Design Compact assembly clearance, no seepage along mounting contact surface.
Consistent Thermal Expansion Ratio Synchronous expansion and contraction with cylinder block, stable sealing in variable temperature.
| Technical Parameter | Specification Details |
|---|---|
| Main Part Number | 20450778 / VOE20450778 |
| Product Type | Cylinder Block Cooling Core Freeze Expansion Plug |
| Applicable Medium | Pressurized antifreeze coolant, high temperature water vapor, anti-rust liquid |
| Main Material | High strength stamped carbon steel alloy |
| Installation Mode | Interference press-fit fixed sealing |
Crawler Excavators: EC140B,EC160B,EC180D,EC200B,EC200D,EC210B,EC210B Prime,EC210D,EC220D,EC240B,EC240B Prime,EC250D,EC290B,EC290B Prime,EC300D
Expansion plug shall be replaced during engine overhaul. Inferior thin plug is prone to rust perforation and sudden popping, bringing severe overheating risk. Engine repair workshops and parts suppliers suggest stocking genuine 20450778 plugs. Match with cooling gaskets, pressure caps and head gaskets to form complete cooling maintenance kit.
Coolant residue crust forms on engine outer wall, obvious slow seepage trace
Coolant liquid level drops frequently, no leakage found on external pipelines
Plug surface severely rusted and pitted, thin wall easy to crack and fail
All models for compatibility reference only. Reliable expansion plug stably seals cooling cavity, prevents coolant loss and engine overheating damage, safeguards long-term safe operation of construction machinery engine.