CAC Gasoline Engine Maintenance And Servicing Manual
75
13. Carburetor backfire.
Cause Correction
(1). Engine ignited too late check or adjust
distributor
(2). Incorrect Timing belt assembling or adjust ‘teeth’ belt tension and
inadequate belt tension tension pulley
(3). Carburetor fuel level too low or check and adjust float chamber
mixture too lean needle valve
(4). Carburetor measuring orifice blocked or clean
float chamber watery
(5). Spark plug overheated or too much carbon deposits adjust and service
(6). Intake valve sealing not well check and service
(7). Intake manifold or connecting hose vacuum leakage check and service
14. Oil pressure warning light is illuminated during engine running.
Cause Correction
(1). Engine oil level too low or not correct fill in engine oil or apply correct engine oil
(2). Oil pressure warning light woks abnormally replace Oil pressure warning light
(3). Engine temperature too high see No. 17.
(4). Engine bearing or fuel pump worn out check, service or replace
(5). Fuel pump relief valve binding or spring deformed check or replace
(6). Oil collector blocked or loose clean or replace or tighten
15. Engine self ignited.
Cause Correction
(1). Too high idle speed, too lean mixture or adjust idle speed or fast idle
boost
fast idle gear out of work
(2). Incorrect fuel grade use fuel of correct grade
(3). Too much carbon deposits in Spark plug or
combustion chamber clean carbon deposits
(4). Idle cut-off valve not works or circuit trouble service or replace
(5). Choke and throttle valve out of work check relevant connecting mechanism
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