Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Belt tension adjustment is made by pivoting the generator at

Isuzu — Belt tension adjustment is made by pivoting the generator at

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

Browse Isuzu generators & specs →

Procedure

  1. 3. FUEL SYSTEM The fuel injection pump and fuel injection nozzles are precisely manufactured, and therefore, using the fuel which contains water or dust particles will result in either injection pump plunger seizure or injection nozzie seizure, and the fouled fuel filter element with sludge or dust particles lead to decreased engine output. In addition, clogged filter element can cause low output or automatic air bleeding failure. Perform inspection and maintenance periodically as follows: {1) Removal of Water from the Fuel If water reaches the fuel filter element bottom, follow the procedure below to drain the water. Procedure: Air bleeding Bod Turn the fuel filter lever just above (close) until it stops to cut off plug ¥ the fuel. (See Fig. 20) \ ; i Loosen the ring nut, remove the cup together with the element, and drain the fuel. Clean the cup, install the element and tighten to the filter body with the ring nut. Turn the fuel filter lever just below (open) unti] it stops to conduct air bleeding for the fuel. NOTICE: 1. If the cup is removed without turning the fuel filter 2) lever just above, the fuel may flow out. . The cartridge and cup contain fuel. Take care not to spill it during disassembly. . Perform the “fuel system air bleeding” after the water in the fuel is drained. Fuel System Air Bleeding The entry of air into the fuel system will cause hard engine starting or engine malfunction. When once the servicing such as emptying the fuel tank, draining for the water sedimentor, and the fuel filter element change is done, be sure to conduct air bleeding. Because of the “automatic air-bleeding system” being employed, turn the starter switch to the “Drive” position and activate the “electromagnetic pump” to bleed the air. Air bleeding procedure: When the “starter switch” is set to the “Drive” (ON) position to activate the electromagnetic pump, fuel is forcibly sent to the fuel valve of each injection pump and further to the leak-off pipe of each nozzle holder, where air in the fuel leaks off auto- matically to the fuel tank. Start the engine and check the fuel system for fuel leak. a LS (3) Fuel Filter Element Change Change interval Fuel filter element change interval : Every 500 operating hours Change procedure 1) Turn the fuel filter lever to the closed position. NOTICE: If the cup is removed without turning the lever as instructed, the fuel may flow out. Loosen the ring nut, remove the cup, and take out the element. Clean the cup, install a new element, and install new packing on the ring nut. Tighten the cut to the body securely with the ring nut. After installation, turn the fuel filter lever to the open position. NOTICE: 1. With the lever positioned just above the fuel remains off, and therefore, the engine cannot be started.
  2. 2. During removal, be careful not to stain the parts around with the fuel in the cup.
  3. 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.
  4. 2. Change the element, if element damage is found during air cleaner cleaning.
  5. 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
  6. 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.
  7. 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.