48550-94600 Suzuki VALVE, MANUAL

1.1 Valve clearance inspection and adjustment
Check and adjust the valve clearance when the engine is cold or when it is warm in whole. (1) Inspecting valve clearance (a) Check the valve clearance by the firing order, by turning the crankshaft by the specified crank angle in normal direction at a time to bring the piston to its top dead center on compression stroke. (b) The top dead center on compression stroke of the piston is identified by the timing mark "0" (on the crankshaft pulley) being aligned with the pointer on the gear case. With the piston so located, either inlet and exhaust valve rocker arms are not being pushed up by their pushrods. On the 6-cylinder engines equipped with a vibration damper, align the timing mark on the damper with the pointer on the gear case.(c) Insert a feeler gauge into between the rocker arm and valve cap, and check the valve clearance.(2) Adjusting valve clearance (a) Loosen the lock nut for adjusting screw, and adjust the clearance by turning the screw in either direction to the extent that the gauge is slightly gripped between the rocker arm and valve cap.(b) After adjusting the clearance, tighten the lock nut, and again check the clearance, making sure that it is correct.1.2 Fuel system priming
(1) Fuel filter (a) Loosen air vent plug (1) at the top of the filter (by turning it about 1.5 rotations).(b) Unlock priming pump handle (2) by turning it counterclockwise, and operate the priming pump.(c) Tighten the air vent plug when fuel flows from the vent hole without bubbles.(2) Fuel injection pump (a) Loosen air vent plug (3) on the injection pump (by turning it about 1.5 rotations).(b) Operate the priming pump handle.(c) Tighten the air vent plug when fuel flows from the vent hole without bubbles. Lock the priming pump by turning its handle clockwise while pushing it down before tightening the last vent plug. (a) If all vent plugs are tightened before the priming pump handle is locked, fuel pressure acts on the feed pump, making it impossible to restore the handle.(b) Wipe off fuel spilt from the vent holes with a cloth.1.3 Fuel injection timing inspection and adjustment
The injection timing for each model of the engine varies according to its output, speed and specification. Be sure to verify the timing by referring to the specifications of each model.(1) Bringing No. 1 piston to top dead center on compression stroke (a) Put socket (58309-73100) to the crankshaft pulley, and turn the crankshaft in normal direction (clockwise as viewed from the front side of the engine).(b) Stop cranking the engine when the timing mark "0" on the crankshaft pulley is aligned with the pointer. On the 6-cylinder engines equipped with a vibration damper, align the timing mark on the damper with the pointer on the gear case.(c) Move the inlet and exhaust valve rocker arms for the No. 1 cylinder up and down to make sure that they are not being pushed up by their pushrods. Now the inlet and exhaust valves should have a clearance to be checked.(2) Inspecting fuel injection timing (a) Remove the delivery valve holder from No. 1 pumping element of injection pump. Take delivery valve, spring and stopper out of the holder, and restore the holder to the pump.(b) Attach a spare injection pipe to No. 1 pumping element, with its free end held downward to that you can see fuel flow from that end.(c) Turn the crankshaft to bring No. 1 piston to about 60° position before top dead center on compression stroke. (d) While operating the priming pump to allow fuel to flow from the injection pipe, crank the engine in normal direction. Reduce cranking speed when the fuel just starts to stop flowing. Stop cranking when the fuel stops flowing.(e) Make sure that the timing mark on the crankshaft pulley is aligned with the pointer.(3) Adjusting fuel injection timing (a) If the timing is retarded, tilt the injection pump toward the crankcase. If it is advanced, tilt the pump away from the crankcase. (b) One graduation of the scale on the injection pump coupling changes the timing by 6° in terms of crank angle.1.4 No-load minimum (idling) speed and maximum speed setting inspection and adjustment
(a) No-load minimum (idling) speed and maximum speed are set for each engine on the test bench at the factory and the set bolts are sealed. These settings are to be inspected and adjusted at Mitsubishi-authorized service shop only.(b) After authorized adjustment of the governor, which has to be made by breaking the seals, be sure to re-seal all visible stoppers, making them appear as if they were sealed at the factory.(c) The stoppers to be sealed are specified. Whether the seals are intact or not has important bearing on the validity of claims, if any, under warranty.(d) When inspecting and adjusting these settings, be on standby to operate the engine stop lever manually in the event of engine overrun.
For inspection and adjustment, warm up the engine thoroughly until the coolant and oil temperature rises to 70°C (158°F), minimum.RSV-type governor
(1) Engine starting (a) Pull the speed control lever to the high-speed side. Operate the starter switch to crank the engine.(b) At about 150 rpm of cranking speed, the engine will fire up to pick up speed. Immediately after the engine fires, move back the speed control lever to hold the speed anywhere between 800 and 1000 rpm. (c) When the engine is noted to be running with a steady speed, move the speed control lever back to low idling speed position.(2) Idling speed setting (setting for no-load minimum engine speed) (a) Hold the speed control lever at the position for no-load minimum run, and set the low idle set screw.
If a critical speed (the speed at which the engine exhibits excessive vibration due to torsional resonance) might exist, shift the idling set to a lower or higher idling level.
(b) Turning the low idle set screw clockwise raises the idling speed.(c) If engine