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BOSCH... Your source for quality nozzles. Quality you can't see, performance you can feel. Each Bosch nozzle is manufactured from high alloy and chrome steel for maximum durability, and heat treated to ensure a long service life. Precision drilled spray holes ensure exact fuel delivery for optimum power and minimum emissions. Critical tolerances are held to +/- 0.5 microns (120 times finer than a human hair) for long life.
"Hydraulic grinding", an exclusive Bosch process, "rounds" the edges of the spray holes by forcing a special abrasive medium through the holes under high pressure. Hydraulic flow characteristics are greatly improved because the abrasive rounds the spray hole inlet that would otherwise erode over time causing diminished engine performance and increased emissions.
Flow rate is continually measured throughout the hydraulic grinding process to assure that exact fuel delivery requirements are attained. The result is a nozzle manufactured to operate at peak performance and emissions levels throughout its service life. Reconditioned nozzles
have lots of hidden problems. "Reconditioning" a nozzle is limited to removing carbon deposits and grinding or lapping the needle seat and the needle cone. A check on a hand tester will show positive chattering characteristics and a good initial seal against leakage. Results good enough to fool both the reconditioner and their customer....but not for long. * Machining the body and needle seat changes the needle lift which directly influences fuel delivery and emissions. * Grinding or lapping the surface of the nozzle body seat removes the hardness, reducing the service life of the nozzle. Since 1985, a VCO (Valve Covering Orfice) type nozzle is being used in for heavy-duty/automotive applications due to more stringent emissions requirements. For this type of nozzle the spray holes are drilled directly into the nozzle seat. Removing material from this area through reconditioning produces a burr at the spray hole, adversely affecting fuel delivery and emissions.
* The seating of the nozzle to the nozzle body is critical. Bosch nozzles are designed with a double angle seat. This design ensures a precise contact point for positive sealing and long service life. Grinding the needle, through reconditioning, alters or entirely eliminates this contact point which could result in leakage or nozzle tip damage due to incorrect needle contact to the nozzle body. * Grinding the needle reduces the diameter of the needle seat causing the needle to seat further into the nozzle body. This creates a throttling effect that alters fuel delivery and emissions. * The overall hardness of a nozzle decreases over time, due to the continued exposure to high operating temperatures in the engine. Reconditioned nozzles have already been exposed to these temperatures once during their initial service life. At Diesel Injection Service you can be assured that all of our rebuilt injectors have New nozzles, remember if you get RE-Conditioned nozzles you will be RE-Paying for another set a whole lot sooner.
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