FE02-0260b

13. Insert  a  flat  screwdriver  into  the  position  shown  in  the

graphic and loosen the crankcase rear end.

FE02-0261b

14. Remove the crankcase.

FE02-0262b

15. Remove the No.3 bearing crankshaft thrust film.

Note

Rotate  the  crankshaft,  so  that  thrust  film  turns  to
facilitate removal.

Engine

Engine Mechanical System JL4G18-D

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FE02-0263b

16. Remove the crankshaft.

Crankshaft inspection, the crankshaft bearing clearance
matching inspection procedure:

1.

Measure  the  main  bearing  bore  diameter  with  an  inner
diameter micrometer and record.

2.

Measure  the  crankshaft  axis  with  an  outside  diameter
micrometer and record.

3.

Select the crankshaft main bearing sizes according to the
recorded sizes in the following table .

Main Bearing

Bore Diameter

(mm/in)

Crank Spindle

Diameter

Diameter (mm/

in)

Thickness Of The

Main Bearing (mm/

in)

52.005-52.011 /

2.0474-2.0477

(No.1)

47.994-48 /

1.8895-1.8898

(No.1)

1.993 

≤ t ≤

1.996/0.0785 ≤ t ≤ 0.

0786

(No.2)

52.011-52.017 /

2.0477-2.0479

(No.2)

47.994-48 /

1.8895-1.8898

(No.1)

1.996 

≤ t ≤

1.999/0.0786 ≤ t ≤ 0.

0787

(No.3)

52.005-52.011 /

2.0474-2.0477

(No.1)

47.988-47.994 /

1.8893-1.8895

(No.2)

52.017-52.021 /

2.0479-2.0481

(No.3)

47.994-48 /

1.8895-1.8898

(No.1)

1.999 

≤ t ≤

2.002/0.0787 ≤ t ≤ 0.

0788

(No.4)

52.005-52.011 /

2.0474-2.0477

(No.1)

47.982-47.988 /

1.8891-1.8893

(No.3)

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Engine Mechanical System JL4G18-D

Engine

Main Bearing

Bore Diameter

(mm/in)

Crank Spindle

Diameter

Diameter (mm/

in)

Thickness Of The

Main Bearing (mm/

in)

52.011-52.017 /

2.0477-2.0479

(No.2)

47.982-47.988 /

1.8891-1.8893

(No.3)

2.002 

≤ t ≤

2.005/0.0788 ≤ t ≤ 0.

0789

(No. 5)

52.017-52.021 /

2.0479-2.0481

(No.3)

47.988-47.994 /

1.8893-1.8895

(No.2)

52.017-52.021 /

2.0479-2.0481

(No.3)

47.982-47.988 /

1.8891-1.8893

(No.3)

2.005 

≤ t ≤

2.008/0.0789 ≤ t ≤ 0.

0791

(No. 6)

FE02-0482b

4.

Install  the  crankshaft  bearing  crankshaft  and  check
whether  the  middle  of  the  crankshaft  journal  has
acceptable loss of roundness and the beating degree.

Standard Value:
Roundness 0.003 mm (Metric) 0.0001 in (US English)
Run Out 0.02 mm (Metric) 0.0008 in (US English)

5.

Check the crankshaft axial clearance.

Standard Value:
0.04-0.24 mm (Metric) 0.0015-0.0094 in (US English)

1

FE02-0483b

6.

With  a  plastic  gap  measurement  regulator,  measure  all
the crankshaft bearings.

Note

Apply  grease  on  the  crankshaft  journal  and
crankshaft  bearings  and  lubricate  slightly  so  the
plastic gap measurement regulator will not be torn
when  measure  the  clearance  of  the  crankshaft
bearing cap.

7.

According to the width of bearing 1, cut the plastic gap
measurement regulator, place the plastic along the axis
between the journal and the crankshaft bearings.

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Engine Mechanical System JL4G18-D

2-413

7

3

1

5

9

10

6

2

4

8

FE02-0269b

8.

Install  the  crankcase,  install  and  tighten  the  crankshaft
bearing cap bolts according to the sequence shown in the
graphic.

Torque
First Pass: 44 Nm (Metric) 32.5 lb-ft (US English)
Second Pass: 60 Nm (Metric) 44.5 lb-ft (US English)

1

FE02-0484b

9.

Remove the crankcase.

10. Measure the width of the plastic strip, check whether the

value  of  crankshaft  bearing  clearance  is  within  the
following range:

Standard Value:
0.015-0.033 mm (Metric) 0.0006-0.0013 in (US English)

11. If the gap value is not within the specified range, re-adjust

the  crankshaft  clearance.  If  necessary,  replace  the
crankshaft.

Installation Sequence:

FE02-0264b

1.

Clean all the relevant parts.

2.

Apply  a  small  amount  of  engine  oil  to  the  crankshaft
bearing.

3.

Install the selected crankshaft bearings.

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Engine