Geely Diagnosis Flow. Manual part — 17

65

No. 037 Abnormal sound of crankshaft bearing

Malfunction Cause

Solution

Oil filter blocked

Replace the oil filter

Poor oil quality

Change oil

Engine water temperature high

Eliminate it in accordance with malfunction
of high water temperature;

Abnormal pressure of oil pump

Check oil pressure, abnormality will also
cause abnormal sound, if necessary,
change oil pump;

Matching clearance between main bearing shell and
main bearing journal too large

Check the matching clearance between
main bearing shell and main bearing
journal, the value is 0.020mm-0.059mm, if
the clearance exceeds limit 0.1mm, it is
necessary to select main bearing shell
again according to measured diameter of
main bearing journal and technical
requirements (empirical value);

Thrust clearance between thrust washers too large

Measure thrust clearance of crankshaft at
thrust washer, the value is
0.087mm-0.177mm, if the value exceeds
limit 0.300mm, the thrust washer should be
changed; (empirical value)

Crankshaft bending

Check crankshaft camber, if the camber
exceeds limit 0.1mm, the crankshaft should
be corrected or changed (empirical value);

Main bearing shell is ablated and worn seriously

Check that there is any peeling, ablation or
other abnormality on the surface of bearing
shell, if the bearing shell fails, it should be
changed;

There is abnormal sound in

crankshaft bearing, sound is

heavy in crankcase with

toneless “plump”; the faster

the engine speed, the louder

the noise, and the noise is

obvious particularly when

accelerating suddenly. When

serious, engine block

vibrates, lubricant pressure

reduces; the noise does not

change when engine

temperature changes.

Bolt on the cover of main bearing shell is loose

If main bearing shell is just loose, tighten
the bolt on the cover of main bearing shell
by torque specified;

66

Replace

Abnormal sound of crankshaft
bearing

Poor oil quality

Oil filter blocked

Engine water temperature high

Crankshaft bending

Main bearing shell is ablated and worn
seriously

Abnormal pressure of oil pump

Thrust clearance between thrust
washers too large

Matching clearance between main
bearing shell and main bearing journal
too large

Bolt on the cover of main bearing
shell is loose

Replace

Check

Replace

Replace

Check

Check

Check

Check

Poor

Blocked

Water temperature high

Bend

Wearing

Abnormal

Too large

Too large

Loose

Normal

Normal

Normal

Normal

Normal

Normal

Normal

Normal

67

No. 038 Abnormal sound of connecting rod bush

Malfunction Cause

Solution

Poor oil quality

Change oil

Oil filter clogged

Replace the oil filter

Oil too diluents

Change oil

Abnormal pressure of oil
pump

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

Shell clearance too large

Check the clearance between connecting rod bearing shells, the
value is 0.020mm-0.063mm, if the clearance exceeds limit 0.1mm, it
is necessary to select connecting rod bearing shell again according
to measured connecting rod bearing diameter and technical
requirements. (empirical value);

Shell wearing excessively,
loosing or breaking etc.

Check that there is any peeling, wearing, ablation or other
abnormality on the surface of connecting rod bearing shell, if the
bearing shell fails, it should be changed;

When engine accelerates

suddenly, obvious clear

and short knocking is

produced and becomes

louder as the loading

increases; creaking can be

heard by shaking throttle

slightly; the noise does not

change obviously when

engine temperature

changes.

Connecting rod bolt is loose

If connecting rod bearing shell is just loose, tighten the bolt by torque
specified;

68

Replace

Abnormal sound of connecting
rod bush

Poor oil quality

Oil too diluent

Abnormal pressure of oil pump

Halfshell clearance too large

Connecting rod bolt loose

Halfshell wearing excessively,
loosing or breaking

Overhaul

Replace

Check

Replace it

Adjust it

Normal

Normal

Normal

Normal

Normal

Normal

Oil filter blocked

Replace