105643-1010 ZEXEL 9 420 615 477 BOSCH AUTOM. ADVANCE MECHANISM 9420615477 1056431010 me738792

Recommended Procedure A. MISFIRING AND RUNNING ROUGHSee the chart, Misfiring and Running Rough. B. PROBLEM WITH VEHICLE or VEHICLE OPERATIONSee the chart, Problem With Vehicle or Vehicle Operation. C. LOW ENGINE RPM1. Governor Linkage Disconnect the governor linkage at the lever on the governor. Move the governor lever by hand until the linkage inside the governor is against the high idle stop. With the accelerator pedal all the way down, adjust the linkage so that the inside linkage is against the high idle stop. Some trucks are equipped with linkage which has spring force and some are equipped with a governor lever of the break over type. On engines with either of these, adjust the governor linkage .250 in. (6,35 mm) longer than necessary for the inside linkage to be against the high idle stop, this will keep tension on the spring at all times. For trucks with tilt cabs, do not make this check with the cab tilted.2. Governor High Idle Adjustment If the governor linkage moves the governor lever to the fully open position, check the high idle rpm with a good tachometer. If the high idle rpm is too low, turn the high idle adjustment screw counterclockwise until high idle rpm is correct. See the RACK SETTING INFORMATION for the correct high idle rpm. If high idle rpm can not be made correct with the high idle adjustment screw, there is a problem inside the governor. Disassemble the governor and check for damage to parts or the wrong parts installed in the governor. D. NOT ENOUGH AIR3. Inlet Restriction Air inlet restriction will cause low power and too much smoke when under load. Check for a restriction with a water manometer or a vacuum gauge (which measures in inches of water). Connect the gauge to the engine air inlet between the air cleaner and the engine. With gauge installed, run engine at full load rpm and check the restriction. Maximum restriction of the air inlet is 30 inches (762 mm) of water. If the indication is higher than the maximum permissible restriction, remove dirt from the filter element or install a new filter element and check the restriction again. If the indication is still too high, there must be a restriction in the inlet piping.4. Exhaust Restriction Make a visual inspection of the exhaust system and look for damage to piping or for a bad muffler. If no damage is found, you can also check the system by removing the exhaust pipes from the exhaust manifolds. With the exhaust pipes removed, start and run the engine to see if the problem is corrected. E. LOW QUALITY FUEL5. Water in Fuel Remove a small amount of fuel from the tank and check for water in the fuel. If there is water in the fuel, remove fuel from tank until it is free of water. Install a new fuel filter and fill the fuel tank with clean fuel. "Prime" (remove the air and/or low quality fuel