Table 4-3.  Troubleshooting  —   continued. Trouble Possible cause Remedy Engine runs unsteadily 1. Inadequate fuel supply. Renew fuel filter and eva- and power output is low. cuate air.  Tighten fuel line connections. 2. Valve clearance out of Readjust valve clearances. adjustment, valve spring Have valve spring renewed. broken. 3. Nozzle needles stick. Have them checked by a specialist. Dense exhaust. 1. Level of motor oil too Drain to upper mark on dip- high. stick. 2. Level of oil in oil bath Pour off oil to reduce level air cleaner too high. to the mark. 3. Inefficient compression Have compression rings and due to seized or bro- pistons checked by a specia- ken compression rings, list. Readjust valve clear- or incorrect valve ances. clearances. Engine overheats. 1. Cooling fins on cyl- Clean cooling fins, on cylin- inders and cylinder der head in particular. heads very dirty. 2. Injectors defective. Have them checked by a specialist. 3. Injection pump delivery Have it readjusted by a spec- out of adjustment. ialist. 4. Insufficient air inducted Clear air intake. to cooling air blower. Engine oil pressure Leaks in lubrication system. Stop engine immediately. too low. Check unions on lubricating pump and oil pressure gauge for tightness and retighten screws.  Otherwise call in a specialist. Battery discharges bet- 1. Build-up of acid on top Clean battery with soda solu- ween uses. of battery (white-gray- tion; rinse with clear water. ish substance) . 2. Infrequent use (units Periodically recharge battery with conventional (approximately every 3 4-32