57 4 DLT ENGINE Measure connecting rod bearing bore. Refer Figure 101 IF CONNECTING ROD BIG END PARENT BORE DIMENSION IS MAINTAINED WITHIN SPECIFIED LIMITS, PROPER BEARING BORE DIMENSION IS AUTOMATICALLY ACHIEVED. However it must be physically measured and confirmed. Measure pretension of connecting rod bearing shell with feeler gauge after loosening connecting rod bearing cap mounting nut on opposite side of bearing shell lug. Refer Figure 102 CONNECTING ROD BEARING SHELL ARE PRECISION FINISHED AND SHOULD NOT BE BORED OR SCRAPED. INSPECTION OF INJECTION NOZZLE Checking nozzle opening pressure - Connect injector assembly to nozzle tester. - Slowly depress nozzle tester lever and read pressure gauge when nozzle starts opening. - If opening pressure is not as per specified value, then adjust as required by selecting proper shims. Check nozzle for leakage - Slowly depress nozzle tester lever until pressure gauge shows 125 bar.The nozzle is leak proof, if no drop comes out of nozzle tip within 10 seconds. - Rectify the leak by cleaning the nozzle elements. Replace nozzle if necessary. Checking nozzle spray - Close shut-off valve. - Depress nozzle tester lever 4 -5 times. The nozzle will then buzz very softly. The automization is satisfactory when the jet cone has uniform closed contour and is finely automized. Inspection of glow plugs - Check glow plugs for short circuits and or for burning. Replace them if necessary. WATER PUMP Check water pump for free rotation. Check for water leakage through leakage hole. It indicates that water seal is damaged and leaking. Replace the water pump if necessary. Dismantling and repairing of water pump is not recommended. Fig. 101 Fig. 102 Checking of thermostat element 1. Remove thermostat element from thermostat housing. 2. Mount thermostat element in suitable fixture and place the fixture in a vessel filled with water. 3. Fix dial gauge with its spindle on valve surface with a pretension of 0.5 mm.
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