6251-11-1380 6251111380 Intake Valve Seat Excavator Engine Parts For KOMATSU PC400

• 6251-11-1380 6251111380 Intake Valve Seat Excavator Engine Parts Fit For KOMATSU PC400

• Specification

• Function and Application

1. Sealing the Combustion Chamber
The intake valve seat forms a tight seal with the intake valve when the valve is closed. This prevents compressed air-fuel mixture (in gasoline engines) or compressed air (in diesel engines) from leaking out of the combustion chamber during the compression stroke. A proper seal ensures maximum compression pressure, which is essential for efficient combustion, engine power, and fuel economy.

2. Heat Dissipation
During engine operation, the combustion chamber reaches extremely high temperatures (often exceeding 2,000°C). The intake valve seat, typically made of heat-resistant alloys (e.g., cast iron or sintered materials), acts as a heat sink. It absorbs heat from the intake valve (which is exposed to combustion gases) and transfers it to the cylinder head, helping to cool the valve and prevent overheating or warping. This protects the valve from damage and ensures its longevity.

• Compatible models

DUMP TRUCKS HM300
ENGINES SAA6D125E
EXCAVATORS PC400 PC450
WHEEL LOADERS WA470 WA480

• More seat parts fit for KOMATSU machinery

• catalog parts list

• We could supply the following spare parts

1 Hydraulic parts: hydraulic pump, main valve, hydraulic cylinder, final drive, travel motor, swing machinery, swing motor etc.

2 Engine parts: engine ass’y, piston, piston ring, cylinder block, cylinder head, crankshaft, turbocharger, fuel injection pump, starting motor and alternator etc.

3 Undercarriage part: Track roller, Carrier roller, Track Link, Track shoe, Sprocket, Idler and Idler cushion etc.

4 Cab parts: operator’s cab, wiring harness, monitor, controller, seat, door etc.

5 Cooling parts: Radiator, air conditioner, compressor, after cooler etc.

6 Other parts: Service kit, swing circle, engine hood, swing joint, fuel tank, filter, boom, arm, bucket etc.

• Advantage

1. Offer Top quality & competitive products

2. Support 12-month warranty

3. 100% tested before shipping

4. Delivery in time

5. A wide range of Oil Pressure Sensor, Fuel Tank Level Sensor, Temperature Sensor, Speed Sensor for excavator 

6. More than 15 years production and 11 years foreign trade experience

7. Professional QC team

8. Best sales team, 24 hours service

• Packing and Shipping

Packing Details :

inner packing : plastic film for wrapping

external packing : wooden

Shipping :

within 3 days after received the payment , by air or by express or by sea on the basis of the

quantity and emergency circumstances.

1. By Couriers: DHL, UPS, FEDEX, TNT are the main courier companies we are cooperated,

2. By Air: Delivery from the Guangzhou air port to customer's destination city air port.

3. By Sea: Delivery from the Huangpu port .

• Product Warranty

1. Warranty Period: 3 Months' warranty from the date of arrival. Longer period of 6 months' warranty could be offered with higher price level.

2. Warranty type: replacement of the parts that have quality problem.

3. Warranty is not valid for below s

* Cutomer give wrong information about the order

* Force Majeure

* Wrong installation and operation

* Rust because of wrong stock & maintenance