178-6633 1786633 Engine Water Pump Assembly for 320C 320D Excavator 3066 Diesel Engine Cooling Parts

The 178-6633 Engine Water Pump Assembly is a replacement diesel engine cooling system component offered for compatible 320C, 320D, and selected 3066 engine applications.

Also known as an Engine Coolant Pump, Diesel Engine Water Pump, Excavator Cooling Water Pump, or Engine Cooling Pump Assembly, this component is designed to circulate coolant through the engine cooling system.

As an essential part of the diesel engine cooling system, the water pump circulates coolant between the engine block, cylinder head, radiator, and associated cooling passages according to the specific engine configuration.

A properly functioning water pump helps maintain coolant circulation, supports engine temperature regulation, and reduces the risk of engine overheating caused by insufficient coolant flow.

The 178-6633 water pump features a dark cast-metal pump housing, precision-machined mounting flange, metal drive hub, internal impeller, mounting bolt holes, and a separate sealing O-ring.

The pump's integrated mechanical structure is designed for installation in compatible excavator engine cooling systems.

JISION supplies excavator water pumps, oil pumps, cooling system components, diesel engine parts, and construction machinery replacement components to equipment owners, repair workshops, construction contractors, and international spare parts distributors.

Product Specifications

Key Features

1. Engine Coolant Circulation

Designed to circulate coolant through compatible diesel engine cooling passages, helping maintain coolant flow during normal engine operation.

2. Heavy-Duty Cast-Metal Housing

Features a rigid cast-metal housing intended for the mechanical and thermal operating environment of construction machinery engines.

3. Internal Impeller Design

Equipped with a curved-blade impeller designed to move coolant through the corresponding engine cooling circuit.

4. Precision-Machined Drive Hub

Includes a machined metal drive hub intended for connection to the specified engine water pump drive mechanism.

5. Integrated Mounting Flange

Features multiple mounting holes and a flange arrangement for installation at the designated engine water pump mounting location.

6. Sealing O-Ring

The pictured product includes a separate O-ring intended for the corresponding pump sealing interface.

7. Engine Cooling System Maintenance

Offered as a replacement option for worn, leaking, damaged, or malfunctioning water pumps in compatible excavator engine applications.

8. Construction Machinery Application

Designed for compatible diesel engines used in excavators and other heavy construction machinery where the pump specifications match.

Compatible Excavator and Engine Models

Primary Reference Excavator Models:

• 320C Excavator

• 320C L Excavator

• 320D Excavator

• 320D L Excavator

Additional Reference Applications:

• 312C Excavator

• 312D Excavator

• 318C Excavator

• 318D L Excavator

• 323D Excavator

Reference Engine Model:

• 3066 Diesel Engine

Reference Part Numbers:

• 178-6633

• 1786633

Important Compatibility Notice

Compatibility depends on excavator serial number, installed engine model, water pump mounting dimensions, impeller configuration, drive arrangement, and original equipment part number.

Not every excavator within the same equipment series uses the same engine or cooling water pump.

E320B compatibility must be confirmed separately using the engine serial number and original water pump identification.

Please verify the original water pump part number and machine specifications before purchasing.

Product Applications

The 178-6633 engine water pump is offered for compatible applications involving:

• Excavator Diesel Engine Cooling Systems

• 3066 Engine Coolant Pump Replacement

• 320C Excavator Water Pump Maintenance

• 320D Excavator Cooling System Servicing

• Diesel Engine Overheating Repairs

• Engine Water Pump Replacement

• Construction Machinery Engine Overhaul

• Heavy Equipment Cooling System Maintenance

Installation and Maintenance Recommendations

Correct water pump installation is essential for engine cooling performance and operating reliability.

Before installation:

1. Verify the original water pump part number and engine serial number.

2. Shut down the engine and allow the cooling system to cool completely.

3. Drain the engine coolant according to the manufacturer's service procedures.

4. Inspect the water pump mounting surface and adjacent cooling passages.

5. Verify the replacement pump mounting dimensions and drive arrangement.

6. Inspect the impeller, shaft, and sealing surfaces.

7. Replace the specified O-ring or gasket components as required.

8. Install the pump using the manufacturer's recommended mounting procedure and tightening torque.

9. Refill the cooling system using the specified coolant.

10. Bleed trapped air and check for coolant leakage.

11. Verify normal coolant circulation and engine operating temperature.

Safety Notice: Never open a pressurized cooling system while the engine is hot. Hot coolant and steam can cause serious burns.

Installation and servicing should be performed by qualified diesel engine maintenance technicians.

Why Choose JISION?

Professional Construction Machinery Parts Supplier

JISION supplies replacement diesel engine components, hydraulic parts, and electrical spare parts for excavators and heavy construction machinery.

Wide Range of Engine Cooling Parts

Our product range includes engine water pumps, radiators, thermostats, cooling fans, fan motors, coolant hoses, engine oil coolers, and other diesel engine replacement components.

International Parts Supply

We support excavator owners, machinery repair workshops, construction companies, and international spare parts distributors with product sourcing inquiries.

Part Number Identification Assistance

Customers can provide original water pump numbers, engine models, machine serial numbers, and pump photos to help identify suitable replacement components.

Wholesale Inquiries Welcome

Contact JISION for wholesale quotations, product availability, bulk orders, and international shipping arrangements.

Ordering Information

Product Name: Engine Cooling Water Pump Assembly

Main Part Number: 178-6633

Alternative Number: 1786633

Reference Excavator Models: 320C / 320D

Reference Engine: 3066 Diesel Engine

Application: Diesel Engine Cooling System

To help ensure accurate product selection, please provide:

• Excavator Brand and Model

• Machine Serial Number

• Diesel Engine Model

• Engine Serial Number

• Original Water Pump Part Number

• Pump Mounting Dimensions

• Drive Hub Specifications

• Impeller Dimensions

• Pump Housing Photos

• Required Purchase Quantity

Contact JISION for product specifications, pricing, stock availability, wholesale orders, and international shipping information.

JISION – Reliable Water Pumps and Diesel Engine Cooling Parts for Excavators and Heavy Construction Machinery.