ISR Performance OE Replacement Water Pump - Nissan RB25DET/RB26DETT

The ISR Performance OE Replacement Water Pump is an aftermarket OE-style replacement for the factory water pump on Nissan RB25DET and RB26DETT engines. Sourcing genuine Nissan parts for RB engines has gotten harder and more expensive as the JDM scene has grown, and this pump performs identically to the factory unit at a fraction of the price. Built to the factory pump's dimensional spec including the gasketless interface.

What It Does

The water pump is a wear item on any RB engine. Bearings wear, seals fail, and a leaking water pump on a built RB is one of the worst possible reasons to be stranded. This pump is the right replacement choice when you need to refresh an aging RB without paying genuine Nissan dealer prices for parts that, for the JDM-only RB engines, often have to be ordered from Japan.

This is not a genuine OEM Nissan pump. It's an aftermarket OE Replacement built to the same spec and intended to replace the factory pump in a refresh, rebuild, or service job.

Critical Installation Note

Silicone gasket maker required for installation. The factory RB25DET and RB26DETT water pump design does NOT use a paper or rubber gasket between the pump and the block. This pump follows that same design. Use a quality silicone gasket maker (Permatex Ultra Grey, Three Bond, or similar) when installing. Skipping the gasket maker will result in a leaking pump.

Fitment

• Nissan RB25DET (Skyline GTS-t R33, GTS-t R32)
• Nissan RB26DETT (Skyline GT-R R32, R33, R34)

RB25DET and RB26DETT only. Not compatible with RB20DET, RB25DE (naturally aspirated), or RB26-based variants outside the DETT.

What's in the Box

• 1x OE replacement water pump for RB25DET / RB26DETT

Product Details

Brand: ISR Performance

Part Number: OE-21010-24U26

Type: Engine Water Pump (OE Replacement)

Engine Fitment: Nissan RB25DET, RB26DETT

OEM vs Aftermarket: Aftermarket OE-style replacement (not genuine Nissan)

Gasket: None - requires silicone gasket maker for installation

Application: Engine refresh, rebuild, or worn pump replacement

Sold: Individually

Legality: Off-road and competition use only