Multiquip MVH-150D manual MVH-150GH/D Troubleshooting Engine, Engine Troubleshooting

MVH-150GH/D TROUBLESHOOTING (ENGINE)

TABLE 8. ENGINE TROUBLESHOOTING

SYMPTON	POSSIBLE CAUSE	SOLUTION
	Spark plug bridging?	Check gap, insulation or
		replace spark plug.
Difficult to start, "fuel is available, but no	Carbon deposit on spark plug?	Clean or replace spark plug.
SPARK at spark plug".	Short circuit due to deficient spark plug	Check spark plug insulation,
	insulation?	replace if worn.
	Improper spark plug gap?	Set to proper gap.
	ON/OFF switch is shorted?	Check switch wiring, replace
		switch.
	Ignition coil defective?	Replace ignition coil.
Difficult to start, "fuel is available, and	Improper spark gap, points dirtry?	Set correct spark gap and
		clean points.
SPARK is present at the spark plug".
	Condenser insulation worn or short	Replace condenser.
	circuiting?
	Spark plug wire broken or short circuiting?	Replace defective spark plug
		wiring.
	Wrong fuel type?	Flush fuel system, and replace
		with correct type of fuel.
Difficult to start, "fuel is available, spark
	Water or dust in fuel system?	Flush fuel system.
is present and compression is normal"
	Air cleaner dirty?	Clean or replace air cleaner.
	Suction/exhaust valve stuck or protruded?	Re-seat valves.
	Piston ring and/or cylinder worn?	Replace piston rings and or
		piston.
Difficult to start, "fuel is available, spark
is present and compression is low"	Cylinder head and/or spark plug not	Torque cylinder head bolts and
	tightened properly?	spark plug.
	Head gasket and/or spark plug gasket	Replace head and spark plug
	damaged?	gaskets.
	Fuel not available in fuel tank?	Fill with correct type of fuel.
	Fuel cock does not open properly?	Apply lubricant to loosen fuel
		cock lever, replace if necessary.
No fuel present at carburetor.
	Fuel filter clogged?	Replace fuel filter.
	Fuel tank cap breather hole clogged?	Clean or replace fuel tank cap.
	Air in fuel line?	Bleed fuel line.

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