TROUBLESHOOTING (ENGINE)

Table 7. Engine Troubleshooting

Symptom

Possible Problem

Solution

Difficult to start

 

 

 

 

 

 

Ignition plug being bridge?

Check ignition system.

Fuel is available but spark plug will not

Carbon deposit at ignition?

Clean or replace ignition.

ignite. (Power available at high tension

Short circuit due to defective insulators?

Replace insulators.

cable).

 

 

Improper spark gap?

Set spark plug gap to the

 

 

correct gap.

 

 

Fuel is available but spark plug will not

Short circuit at stop switch?

Check stop switch circuit.

ignite. (Power NOT available at high

Replace stop switch if defective.

 

tension cable).

Ignition coil defective?

Replace ignition coil.

 

Muffler clogged with carbon deposits?

Clean or replace muffler.

Fuel is available and spark plug ignites

Mixed fuel quality is inadequate?

Check fuel to oil mixture.

 

Flush fuel system and replace

(compression normal).

Fuel in use inadequate (water, dust)?

with fresh fuel.

 

 

 

Air Cleaner clogged?

Clean or replace air cleaner.

 

Defective cylinder head gasket?

Tighten cylinder head bolts or

Fuel is available and spark plug ignites

replace head gasket.

 

(compression low).

Cylinder worn?

Replace cylinder.

 

Spark plug loose?

Tighten spark plug.

Operation not satisfactory

 

 

 

Air cleaner clogged?

Clean or replace air cleaner.

Not enough power available

Air in fuel line?

Bleed (remove air) from fuel line.

Fuel level in carburetor float chamber

 

(compression normal, no miss-firing).

Adjust carburetor float.

improper?

 

 

 

Carbon deposits in cylinder?

Clean or replace cylinder.

 

Ignition coil defective?

Flush fuel system and replace

 

with fresh fuel.

 

 

Not enough power available

Ignition plug often shorts?

Replace ignition wires, clean

(compression normal, miss-firing).

ignition.

 

 

Fuel in use inadequate (water, dust)?

Flush fuel system and replace

 

with fresh fuel.

 

 

 

Excessive carbon deposition in

Clean or replace crankcase.

 

combustion chamber?

 

 

Engine overheats.

Exhaust or muffler clogged with carbon.

Clean or replace muffler.

 

Spark plug heat value incorrect?

Replace spark plug with correct

 

type spark plug.

 

 

PAGE 26 — QP402H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #2 (01/29/14)

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Multiquip qp402h Troubleshooting Engine, Engine Troubleshooting, Symptom Possible Problem Solution Difficult to start

qp402h specifications

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