Geely Diagnosis Flow. Manual part - 18

Geely Diagnosis Flow. Manual part - 18


69

No. 039 Camshaft with abnormal sound

Malfunction Causes

Solution

Engine with high water temperature

Eliminate malfunction based on high water temperature;

Engine oil with poor quality

Replace engine oil;

Oil filter blocked Replace

filter;

Camshaft cam is worn, causing
abnormal sound

Check camshaft; repair or replace;

Fit clearance between camshaft and
camshaft bearing too large

Check fit clearance; if necessary, repair engine or replace
concerned malfunction parts;

Camshaft seat burnt and damaged

Check it is burnt and damaged; repair the engine;

Hardness of internal spring of the
gear not enough

Replace the spring or assembly;

When the engine is
normal, sound similar
as resonance
appears; when
severe, irregular noise
appears.

Pressure of oil pump abnormal

Check oil pressure, which will cause abnormal sound if abnormal;
if necessary, replace oil pump;

Fit clearance between camshaft and wall

Hardness of internal spring of the
gear not enough

Pressure of oil pump abnormal

Camshaft seat burnt and damaged

Engine oil with poor quality

Oil filter blocked

Engine with high water temperature

Camshaft with abnormal sound

Repair

Repair

Repair

Replace

Replace

Replace

Replace

Cam worn

Replace

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Worn

Not good

blocked

Burnt

Abnormal

Stiffness

Too large

Abnormal


70


No. 040 Camshaft driving gear with abnormal sound

Malfunction Causes

Solution

Lubricating oil with poor quality

Replace lubricating oil

Fit clearance not matched

Strained clearance of driving gear not matched, causing
abnormal sound;

Improper assembling

Check driving gear of admission camshaft and that of exhaust
camshaft are correctly assembled; if not, reassemble;

Matching angle under stress not even

Adjust angle of driving gear; if necessary, replace it;

Hardness of internal spring of the gear not
enough

Replace the spring or assembly;

Check inlet filter screen of oil pump is blocked; if so, clean or
replace;

Check clearance between drive gear and driven gear of oil
pump. And check relief valve is blocked; if so, repair or replace;

Engine oil pressure too low

Check lubricating system is leaking, and mainly check clearance
of connecting rod tile; if leaking, eliminate it;

Camshaft driving
gear with
abnormal sound

Driving gear worn

check driving gear is with obvious metal damaging traces,
causing noises; if so, replace it;

Reassemble

Camshfat driving gear with abnormal sound

Improper
assembling

Lubricating oil with poor
quality

Matching angle under stress not even

Fit clearance of gears not
matching

Hardness of internal spring of the gear not
enough

Engine oil pressure too
low

Driving gear worn

Replace

Repair

Replace

Repair

Replace

Replace

Normal

Worn

Normal

Normal

Normal

Normal

Normal

Too low

Stiffness
insufficient

Not matching

Unusual

Poor

Improper


71


No. 041 Cylinder knocking sound

Malfunction Causes

Solution

Put screwdriver at filler port, and put your ear against the
screwdriver lever, and carefully observe and listen;

Flame out for cylinders gradually; if sound of this cylinder weakens
or disappears, then it is confirmed that this cylinder has abnormal
sound;

To differentiate from other abnormal sound, fill in some lubricating
oil at spark plug hole of this cylinder; if the sound weakens or
disappears, then it is confirmed as piston knocking sound;

Piston and cylinder wall severely
worn, with too large clearance

When knocking sound is very severe and filler port is smoking
externally, it is because that clearance between piston and cylinder
wall is too large;

Fuel grade too low, with poor
quality

Check fuel quality, and confirm its grade; if not reaching specified
requirements, replace it;

Ignition time too early

Check ignition timing. When the engine is at idling speed, ignition
advance angle is 10°--12°; if not correct, adjust advance angle of
initial ignition of the engine. When accelerating, ignition advance
angle could automatically be increased to 20°--30°. If unusual,
check ignition control system or replace ECU;

Engine oil filter blocked

Replace engine oil filter;

Knock sensor malfunction

Check knock sensor; if piston knocking is caused due to damaged
knock sensor, replace it;

Carbon deposit within the
cylinder too many

Check carbon deposit within the cylinder; if too many causing
glowing ignition and piston knocking, clean it;

Clearance of connecting rod tile
too large

Check and repair the engine;

Piston ring blocked

Check operations of piston ring; if blocked, repair or replace it;

Compression ratio too large

Check cylinder cover is grinding; if grinding too large causing
combustion chamber smaller, and compression ratio too large
causing piston knocking, replace cylinder cover;

When the engine
operates at idling speed,
upper of cylinder body
generates clear and
rhythmical metal
knocking sound “Dang”.
When cooling, the sound
becomes obvious. With
rising engine
temperature and speed,
the sound becomes
smaller or disappears.

Clearance of piston ring too
large

Check piston ring; if necessary, replace it;


72

Fuel grade too low, with poor quality

Ignition time too early

Clearance of connecting rod tile
too large

Piston ring blocked

Filter element blocked

Clearance of piston too large

Carbon deposit within the cylinder
too many

Knock sensor malfunction

Piston and cylinder wall severely worn its
clearance

Cylinder knocking
sound

Repair

Repair

Repair

Replace

Replace

Adjust

Replace

Replace

Replace

Normal

Too large

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Blocked

Blocked

Large clearance

Too many

Abnormal

Too early

Poor quality

Worn

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