Isuzu — 2. During removal, be careful not to stain the parts

A Isuzu service procedure — check it applies to your exact model before use.

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Procedure

1. 3. After changing the fuel filter element, conduct fuel air bleeding. Cartridge Set a filter wrench here Change procedure with spin-on type filter Loosen the fuel filter turning it counterclockwise with a filter wrench. With a rag wipe clean the fitting face on the upper cover, so that new fuel filter can be seated properly. Lightly oil the O-ring. To reinstall, turn the filter assembly clockwise carefully to prevent the fuel from spilling until the O- ring is fitted against the sealing face of the filter cover. Turn 2/3 turn further with the filter wrench. Governor Control Seals As the governor (timing gear case) is precisely adjusted, most of the controls are sealed, please do not break them. When the adjustment is necessary, contact with your machine supply source. AIR INTAKE SYSTEM Air Cleaner Engine performance and life vary with the air intake conditions. A dirty air cleaner element reduces t he amount of intake air, causing reduced engine output or disordered engine. Also, a damaged element leads to abrasion of cylinders and valves, resulting in increased oil consumption, reduced output and shortened engine life. Handling of air cleaner varies with the equipment model. Perform periodic inspection and maintenance following the equipment manufacturer's instructions, NOTICE: 1. Shorten’ the cleaning or change interval when the equipment is used in dusty areas.
2. 2. Change the element, if element damage is found during air cleaner cleaning.
3. 3. Take care not to cause air leakage (sucking) when reassembling the air cleaner. INDICATOR Red signal CLOGGED Air Cleaner with Dust Indicator This indicator is attached to the air cleaner. When the air cleaner element is clogged, air intake resistance becomes greater and the dust indicator signal turns into red indicating the element change timing. When the signal turns into red, clean the air cleaner or replace the element. Then press the dust indicator button to reset the indication. Eye level Electrolyte Specific gravity
4. 5. ENGINE ELECTRICAL The ISUZU engines uses a 12 volt system and a negative grounding type for the electrical system. (1) Battery Servicing Battery maintenance schedules will vary with equipment and battery types. Follow the equipment manufacturer's instructions. Gravity of the batteries The battery charge condition is judged by the electrolyte gravity measurement. Periodically measure the electrolyte gravity of the batteries. For the internal check follow the equipment manufacturer's standard. The relationship between the electrolyte specific gravity and the battery conditions are as follows: Below 50% (Insufficiently charged) NOTICE: The battery electrolyte is dilute sulfuric acid. So, be careful not to stain your body and clothes with it. If stained, rinse portion in. clean water. Gravity conversion The specified electrolyte temperature for the gravity measure- ment is 20°C (68°F). Measure the electrolyte temperature and do the conversion in accordance with the following formula when the temperature does not fall to the specified temperature. $20 = St + 0.0007 (t —20) $20 ; gravity at 20°C St ; gravity measured t ; electrolyte temperature whe measured Battery terminal connections Periodically, check the battery terminals for loose connection and corrosion. For the check interval, follow the machine manufacturer’s standard. Loose connection will cause hard engine starting or deficient battery charging. lf the terminals are excessively corroded, disconnect the battery cables and polish them with a wire brush or sandpaper. Never reverse the “+” and “—" terminals when reconnecting the cables. Even a short period of reverse connection could damage the electrical parts. ee SSS S/S SS Cleaning of Battery When the battery is fouled clean it with clean water or tepid water and wipe them with a dry cloth to remove the water. Apply a light coat of vaseline or a grease to the battery post. Generator Servicing The polarity of the generator is negative grounding type. When an inverted circuit connection take place, the circuit will be in short circuit instantaneously resulting the generator failure. Do not put water directly on the generator. Entry of water into the generator leads an electrolyte corrosion causing a generator failure. Pay attention particularly when cleaning the engine. When the battery is charged with a external electric source, be sure to disconnect the battery cables. Wiring Connections Check all of the electric wiring connections for looseness and damage.
5. 6. ENGINE ASSEMBLY AND OTHERS To continue trouble free engine operation over a long period of time, the servicing items need a skilled maintenance technican, therefore, consult your machine supply source on the following items when necessary. (1) Fuel Injection Nozzie Use an injection nozzle tester to check the static injection starting pressure and the fuel spray conditions. Injection nozzle pressure test interval : Every 500 operation hours When the injection starting pressure is too high or too low or the fuel spray pattern is improper, an abnormal fuel combustion take place in the engine leading a lowered output and blackish exhaust smoke. Further, it causes a piston seizure or piston damage etc. In such cases, the injection nozzle test or the nozzle - replacement is required. Injection starting pressure 12.7 ~ 13.7 MPa {1850 ~ 1990 psi) <\) dues ‘Mark groove i} f a — Timing gear _ case cover 7S E ‘EX Cylinder No.1 exhaust compression ¢ — \\_ as} Valve Clearance Adjustment The valve clearance must be adjusted every 1000 operating hours, or whenever the valve rocker is abnormally noisy, or in an engine malfunction though the fuel system is properly working. Valve clearance : 0.20 mm (0.0078 in) (When the engine is cold.) Adjustment Procedure Turn the crankshaft clockwise so that the mark groove on the crank pulley is aligned with the TDC mark (cast out} on the timing gear case cover. Remove the cylinder head cover and check to see if cylinder No. 1 is at TDC in the compression stroke or at TDC in the exhaust stroke. When the intake and exhaust valves are closed, the cylinder is at TDC in the compression stroke, and when only the exhaust valve is open, it is at TDC in the exhaust stroke. 3) In accordance with the conditions of cylinder No. 1, measure and adjust, if required the clearance of the valves marked with

Source: manual:ISUZU Instruction Manual 3LA1 3LB1 3LD1 2000.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.