The Gates 42577 is a high-quality OE-replacement water pump designed specifically for the 2003–2005 Mitsubishi Lancer Evolution VIII. It is engineered to provide reliable coolant circulation through the Evo 8’s 4G63 engine cooling system and serves as a replacement for the original Mitsubishi OEM water pump part #1300A065.
Product Details
- Brand: Gates
- Product: Engine Water Pump
- Part Number: 42577
- Application: Mitsubishi Lancer Evolution VIII
- Model Years: 2003–2005
- Chassis: CT9A
- Engine: 4G63 / 4G63T 2.0L Turbo
- Type: Mechanical OE-replacement water pump
- OEM Replacement: Mitsubishi 1300A065
- Condition: Brand new
- Pulley: Not included
- Gasket: Included
- Water Pipe O-Ring: Included
- Quantity: 1 water pump
- Warranty: Manufacturer limited lifetime warranty
Evo 8 Fitment
The Gates 42577 is specifically listed for:
- 2003 Mitsubishi Lancer Evolution VIII
- 2004 Mitsubishi Lancer Evolution VIII
- 2005 Mitsubishi Lancer Evolution VIII
- Evo VIII RS
- Evo VIII MR
Gates 42577 is not intended for Evo 7 or Evo 9, so the vehicle’s exact generation should be confirmed before ordering.
Function
The water pump is responsible for circulating engine coolant through the 4G63 cooling system. It moves coolant through the engine, thermostat, water passages, and radiator to help maintain stable operating temperatures.
The Gates 42577 uses a precision-balanced impeller designed to provide consistent coolant flow while reducing stress on the pump’s seals and bearings. Its unitized bearing and seal assembly is designed for long service life and leak-free operation.
Gates Construction & Quality
Gates states that its water pumps undergo 100% functional testing of seals and bearings as well as leakage testing of the casting and fully assembled pump. The 42577 is manufactured as a new OE-replacement unit rather than a remanufactured pump.
Key features include:
- Precision-machined mounting surfaces
- Unitized bearing and seal assembly
- Precisely balanced impeller
- Quality-forged housing
- OE-style fit and function
- No-sealant-required gasket
- Leak and functional testing before shipment
What’s Included
1 × Gates 42577 Water Pump
1 × Water Pump Gasket
1 × Water Pipe O-Ring
The water-pump pulley is not included and must be purchased separately if required.
OEM Replacement
The Gates 42577 replaces the Mitsubishi 1300A065 water pump used on the Evo 8. It is suitable for routine cooling-system maintenance, water-pump replacement, timing-belt service, engine rebuilding, and modified 4G63 applications where a reliable OE-style replacement pump is desired.
Important Fitment Note
Gates 42577 is for Evo 8 only. There are known differences between Evo 8 blocks and certain JDM/other-market 4G63 applications, so fitment should be verified against the vehicle’s VIN and engine configuration before installation. Community reports specifically note that some JDM Evo 8 applications may require a different pump configuration.
Brand: Gates
Part Number: 42577
Application: Mitsubishi Lancer Evolution VIII
Years: 2003–2005
Chassis: CT9A
Engine: 4G63 / 4G63T 2.0L Turbo
OEM Replacement: 1300A065
Includes: Water Pump + Gasket + Water Pipe O-Ring
Pulley: Not Included
Quantity: 1
Type: Gates OE-Replacement Engine Water Pump
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