Bedienungsanleitung Vanguard Single Cylinder (Seite 34 von 281) (Englisch)

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Dry plug symptoms:

• Leaking carburetor mounting gaskets

• Gummy or dirty carburetor, fuel line or

tank

• Float needle valve stuck shut

• Inoperative fuel pump

• Inoperative anti–afterfire solenoid

To determine if fuel is getting to the combustion

chamber through the carburetor, remove the

spark plug and pour a small quantity of gasoline

through the spark plug hole. Replace the spark

plug.

If the engine fires a few times and then stops:

• Focus your attention on dry plug

symptoms.

If the engine does not fire:

• Replace the spark plug.

COMPRESSION

Check the sealing capability of compression

components by using cylinder leakdown tester

Tool# 19545. The leakdown test will identify which

components may be at fault.

A regulated amount of compressed air is used to

pressurize the combustion chamber with the

piston at Top Dead Center (TDC) on the

compression stroke. By listening for air leaks, it

is possible to isolate a specific component or

components causing a problem. An engine in

good condition will display a reading in the green

area on the outlet gauge with a minimum of

audible leakage. A reading in the yellow or red

area along with high audible leakage noise,

indicates a problem with the compression

components.

A small amount of air leakage is normal in all

engines, including new engines, providing that

the outlet gauge remains in the green area.

However, if a single component is displaying

more audible leakage, look to that component for

a potential problem.

For example:

Frequently, a slight air leak at the head gasket

may not register on the gauge. Obviously the

head gasket would require replacement, as any

leak at the head gasket would have an adverse

affect on engine performance.

Compression Test

1. Run engine for 5 minutes allowing engine

to reach operating temperature.

NOTE: If engine is cold or cannot be started, air

flow may be higher (gauge readings lower)

because compression components are not at

normal operating temperatures.

2. Remove spark plugs from engine.

Disconnect air cleaner tube and cylinder

breather tube at carburetor intake elbow.

3. Rotate crankshaft in direction of operation

until piston for cylinder being tested is at

top dead center of the compression

stroke.

4. Assemble the clamping tool (comes in kit

#19545) to the crankshaft. Tighten screws

(A) securely to prevent the crankshaft

from turning.

5. Insert drive end of a 3/8” breaker bar into

slot of clamp. Hold the breaker bar to

prevent the crankshaft from turning or

install a bolt through the slot of the tool

([B] Fig. 2) into an open hole in the bolt

circle of the cylinder cover.

Fig. 2

WARNING

Injury may occur if the crankshaft is

allowed to rotate or the engine is not

securely fastened to a stand or the

application. The air pressure can create a

substantial rotational force if the crankshaft

is not locked with the piston at top dead

center.

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Vanguard Single Cylinder Seite 34

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