Kohler 5E Operatie - Pagina 31

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3.8 Ignition System

Service spark plugs at the interval specified in the

service schedule using the following procedure.

Spark Plug Service Procedure

1. Remove spark plug wires by grasping the spark

plug boot and turning slightly while pulling. Do not

pull the wire. Pulling on the wire rather than the

boot may damage the wire or terminal.

2. Loosen the spark plug with a ratchet and 5/8-in.

spark plug socket with a rubber insert to prevent

spark plug damage.

Problem/Condition

Gap-bridged spark plug

Oil-fouled spark plug

Carbon-fouled spark plug

Lead-fouled spark plug

Preignition damaged spark plug

Overheated spark plug

Worn spark plug

Figure 3-12 Engine Evaluation Using Spark Plug Condition

TP-5985 10/02

3. Use compressed air to remove dirt from around

4. Remove spark plugs, one at a time, and examine.

Means of Identification

Built-up deposits and gap between

electrodes closing.

Wet, black deposits on the insulator

shell, bore, and electrodes.

Black, dry, fluffy carbon deposits on

insulator tips, exposed shell surfaces

and electrodes.

Dark gray, black, yellow, or tan deposits;

or a glazed coating on the insulator tip.

Melted electrodes and possibly blistered

insulator. Metallic deposits on insulator

suggest internal engine damage.

White or light gray insulator with small

black or gray/brown spots with bluish

(burned) appearance on electrodes.

Severely eroded or worn electrodes.

each spark plug to prevent dirt particles from falling

into the combustion chamber.

Identify a normal spark plug in good operating

condition by observing a light tan or gray deposit on

the firing tip. See Figure 3-12 to evaluate engine

condition by color/condition of a problem spark

plug.

Possible Cause/Solution

Oil or carbon fouling. Clean and regap

the spark plug.

Excessive oil entering combustion

chamber through worn rings and

pistons, excessive clearance between

valve guides and stems, or worn or

loose bearings. Replace the spark plug.

Incorrect spark plug, weak ignition,

clogged air intake, defective fuel pump,

overrich fuel mixture, or excessive

no-load operation. Clean and regap the

spark plug.

Caused by highly leaded fuel. Replace

the spark plug.

Wrong type of fuel, incorrect timing or

advance, too hot a plug, burned valves,

or engine overheating. Replace the

spark plug.

Engine overheating, wrong type of fuel,

loose spark plugs, too hot a plug, low

fuel pump pressure or incorrect ignition

timing. Replace the spark plug.

Caused by normal wear and failure to

replace spark plug at prescribed

interval. Replace the spark plug.

Section 3 Scheduled Maintenance