Briggs & Stratton 750 DOV Series Spécifications télécharger pdf (Page 23)

Figure 2 - 2

If spark does not occur, look for:

• Improperly operating interlock system

• Shorted equipment or engine stop switch

wire

• Incorrect armature air gap

• Armature failure

2) Check Carburetion

Before making a carburetion check, be sure the

fuel tank has an ample supply of fresh, clean

gasoline.

Be sure the shutoff valve, if equipped, is open

and fuel flows freely through the fuel line. If fuel

fails to flow or is slow, check for plugged fuel cap

vent, fuel line restriction or plugged fuel filter.

Be sure throttle and choke controls are properly

adjusted.

If engine cranks but will not start, remove and

inspect the spark plug.

If plug is wet, look for:

• Over choking

• Excessively rich fuel mixture

• Water in fuel

• Float needle valve stuck open

• Plugged air cleaner

• Fouled spark plug

If plug is dry, look for:

• Leaking carburetor or intake manifold

gaskets

• Gummy or dirty carburetor, fuel filter, fuel

lines or fuel tank

• Float needle valve stuck closed

• Inoperative fuel pump (if equipped)

• Inoperative fuel shut off solenoid (if

equipped)

A simple check to determine if the fuel is getting

to the combustion chamber through the

carburetor is to remove the spark plug and pour

a small quantity of gasoline through the spark

plug hole. Replace the plug. If the engine fires a

few times and then stops, look for the same

conditions as for a dry plug.

3) Check Compression

Use Leakdown Tester #19545 to check the

sealing capabilities of the compression

components.

Follow the instructions provided with the tester to

perform the leakdown test.

NOTE: Any air leaks at the connections or

fittings of the tester will affect the accuracy of the

test.

Listen for air leaking from the cylinder head

gasket, carburetor, exhaust system, and the

crankcase breather tube.

• Air flowing between the cylinder and

cylinder head indicates that the cylinder

head gasket is leaking.

• Air flowing from the carburetor indicates

air is leaking past the intake valve and

seat.

• Air flowing from the exhaust system

indicates air is leaking past the exhaust

valve and seat.

• Air flowing from the crankcase breather

tube or high oil fill dipstick tube indicates

air is leaking past the piston rings.

Possible Causes for Poor Compression:

• Loose cylinder head bolts

• Blown head gasket

• Burned valves, valve seats and/or loose

valve seats

• Insufficient tappet clearance

• Warped cylinder head

• Warped valve stems

• Worn bore and/or rings

• Broken connecting rod

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Briggs & Stratton 750 DOV Series Spécifications Page 23

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