Fuel Injector: Service Precautions

WARNING:
When testing, use only clean testing oil or filtered diesel fuel. Never place any body part in the discharge jet of the nozzle. Fuel jet will deeply penetrate the flesh and destroy the tissue. Fuel entering into blood may cause blood poisoning.
The shutoff valve for the pressure gauge should remain closed during spray pattern and buzzing tests to prevent damage from excessive and rapid pressure fluctuations.

GENERAL INFORMATION:
A CHIP (Center Hole In Pintle) nozzle is a fuel injection nozzle with Bosch designation DN 0 SD 240. This nozzle differs from the regular pintle nozzle by a cross hole and a center hole in the tip of the nozzle. In addition, a maintenance free filter insert is pressed into the fuel inlet of the upper injection nozzle holder part.
Verify the problem with the customer. If slight or occasional knock is the complaint, or knocking occurs during cold start only, experience has shown that the use of a different brand of diesel fuel will often cure the problem. Keep in mind that knocking of a cold diesel engine is not a sign of malfunction and will not harm the engine. Perform all verification tests with the engine at operating temperature. If the knocking persists after operating the vehicle on one or more tanks of different fuel, the nozzle assemblies must be removed.