Description
As with all of the Whitbread Performance Innovations machined products, the block is 100% CNC cut in-house in Johannesburg, Michigan.
For those who don’t know, the CP4 is the fuel injection pump that is installed on the second-generation USA BMW diesels with the N47 and N57 engines. This injection pump uses only its fuel supply for lubrication. Diesel first flows into the bottom end of the pump to lubricate the camshaft, rollers, lifters, and bushings before the diesel flows up to the metering valve to be used for injection. Unfortunately, the CP4 can be rather sensitive to fuel quality. If contamination occurs and one of the rollers gets stuck, the pump will start making metal shavings at the bottom end. As the CP4 continues to pump, it is now pumping diesel contaminated with metal shavings through the metering valve and into the rest of the injection system. When this failure occurs, the CP4, injectors, fuel rails, rail pressure sensor, pressure control valve, high-pressure lines, injector return lines, tank lines, and fuel module will all need to be replaced. This kit doesn’t prevent a failure from happening, but it does isolate the CP4’s lubrication supply from the injection fuel supply and prevents all the other components in the injection system from being damaged. Because of how the metering valve is isolated and given its own supply with this kit, in the event of a failure, only the CP4 and return filter will need to be replaced.
The block itself has been recently updated to use a permanent, pressed-in sealing plug that will come pre-installed in the block when you receive your kit.
The 10 micron fuel filter included with the kit also contains a neodymium ring magnet on the outlet side of the element to help further catch any fine metallic particles.
If you have a highly tuned N47 and experience a low rail fault after installation, Whitbread offers a Cascade Valve Adjustment Tool Kit to adjust the feed pressure of your CP4.
Instructions for N47/N57 installation courtesy of Whitbread Performance Innovations LLC
