Kohler 15REYG Операція - Сторінка 27

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3.7 Ignition System

Service the spark plugs at the interval specified in the

service schedule using the following 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.

3. Use compressed air to remove dirt from around

each spark plug to prevent dirt particles from falling

into the combustion chamber.

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

Identify a normal spark plug in good operating

condition by observing a light tan or gray deposit on

the firing tip. See Figure 3-9 to evaluate engine

condition by color/condition of a problem spark

plug.

5. Clean spark plugs by wiping them with a rag. File

the center electrode to keep it parallel to the side

electrode.

Note: Do not sandblast, wire brush, scrape, or

otherwise service spark plug in poor

condition.

results.

Problem/Condition

Means of Identification

Gap-bridged spark

Built-up deposits and gap between electrodes

plug

closing.

Oil-fouled spark plug

Wet, black deposits on the insulator shell, bore,

and electrodes.

Carbon-fouled spark

Black, dry, fluffy carbon deposits on insulator

plug

tips, exposed shell surfaces and electrodes.

Lead-fouled spark plug Dark gray, black, yellow, or tan deposits; or a

glazed coating on the insulator tip.

Preignition damaged

Melted electrodes and possibly blistered

spark plug

insulator. Metallic deposits on insulator suggest

internal engine damage.

Overheated spark plug White or light gray insulator with small black or

gray/brown spots with bluish (burned)

appearance on electrodes.

Worn spark plug

Severely eroded or worn electrodes.

Figure 3-9 Engine Evaluation Using Spark Plug Condition

TP-6728 10/11

Obtain a new plug for best

6. Check the spark plug gap before installing any

spark plug. See Figure 3-7 and Figure 3-8. Attain

a correct gap when the feeler (or wire) passes

between the spark plug electrode. It should pass

easily but with some resistance or drag; otherwise

adjust as necessary.

Model

15/30 kW

Figure 3-7 Recommended Spark Plug Gap

1. 0.8-0.9 mm (0.031-0.035 in.) gap

2. Spark plug electrodes

Figure 3-8 Spark Plug Gap Inspection

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, 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 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

Spark plug gap

0.9 mm (0.035 in.)

1-514