Preliminary Testing
Injection nozzle problems are usually accompanied by knocking in one or more cylinders, engine overheating, loss of power or performance, black exhaust smoke and increased fuel consumption. To locate and correct faulty injectors, proceed as follows:
- With the engine running at fast idle, loosen line unions on each injection nozzle one at a time. If engine speed remains constant with a line removed, that nozzle is defective.
- To remove nozzle, detach injector line. Use special extra-deep socket (US 2775) to remove injection nozzles. To disassemble, place upper part of nozzle in a vise and loosen lower part. Then reverse position of nozzle in vise and carefully remove internal parts from lower part of nozzle. Do not interchange parts from one injector to another.
- To install, insert new heat shield with recess pointing upward. Tighten nozzles to 51 ft. lbs. (69 N.m) and lines to 18 ft. lbs (24 N.m). Bleeding is not necessary.