ENGINE DIAGNOSTIC TEST PROCEDURES Section 6 • TEST INJECTION NOZZLES - 400 Series On-Highway (with Robert Bosch MW Pumps) FROM FORM NO. CGED-365 TEST INJECTION NOZZLES 12 A. SPRAY CONDITION B. VALVE OPENING PRESSURE C. LEAKAGE INSTRUMENT GUIDELINE DATA‚ 1st CHECK 2nd CHECK HAND TEST PUMP [NOZZLE TESTER] (SE-2002) p Refer to "Performance Data Guidelines", in this section. This is a functional test of injection nozzle performance. Nozzles must be removed from the engine and tested for SPRAY   CONDITION,   VALVE   OPENING   PRESSURE and LEAKAGE. NOTE:  If proper tools and facilities are not available to   test   or   repair   nozzles,   and   nozzles   are   the suspected problem; replace all nozzles with new or renewed nozzles. IMPORTANT IN     OUTLINING     THE     PROCEDURE     FOR INSPECTION  OF  INJECTION  NOZZLES,  THE NECESSITY  OF  CLEANLINESS  CANNOT  BE OVER-EMPHASIZED. A CLEAN WORKBENCH, CLEAN WASHING FLUID AND CLEAN   TOOLS   ARE   ALL   ESSENTIAL   TO PRODUCE  SATISFACTORY  RESULTS.    THE USE  OF  SUITABLE  TOOLS  FOR  THIS  TYPE OF WORK IS EQUALLY IMPORTANT. 1. Injection Nozzle Removal: a. Detach  high-pressure  tubing  and  leak-off  lines, covering their opening ends with plastic, cloth or paper  caps  to  protect  against  the  entrance  of dirt. b. Remove    mounting    bolt    and    clamp,    where applicable.        Pull    nozzle    assembly    from    the cylinder head being careful not to strike the end of  the  nozzle  against  any  hard  surface.    If  the assembly   seems   to   be   stuck,   break   it   loose from carbon deposits to facilitate removal. c. Cover  nozzle  openings  with  protector  caps  to prevent   the   entrance   of   dust.      Also   protect nozzle tip, with protective caps. d. Remove   injector   nozzle   gasket    from    nozzle bore with suitable tool, discard and replace with new gasket. CGES-240-4 Printed in United States of America Page 33