Daewoo Musso. Manual - part 72

1B2-108  M161 ENGINE MECHANICAL

Group Code Letter and Cylinder Bore Size

CYLINDER BORE

Group Code Letter of Cylinder

A

X

B

X + 5

X + 10

A

X

B

X + 5

X + 10

Piston Type to be Used

A or X

A, X or B

X or B

X + 5

X + 10

A or X

A, X or B

X or B

X + 5

X + 10

Cylinder Bore Size (mm)

f

 

90.906 - 

f

 90.912

f

 90.906 - 

f

 90.912

f

 90.912 - 

f

 90.918

f

 90.950 - 

f

 90.968

f

 91.000 - 

f

 91.018

f

 

89.900 - 

f

 90.906

f

 89.906 - 

f

 89.912

f

 89.912 - 

f

 89.918

f

 89.950 - 

f

 89.968

f

 90.000 - 

f

 90.018

Engine

E23

E20

M161 ENGINE MECHANICAL  1B2-109

Service Data Standard

Measurement of Cylinder Bore

1. Clean the cylinder wall.

2. Using a internal diameter gauge, measure the bore size in

axial and transverse direction at three points (1,2,3).

1,2,3 Measuring  Points

A. Axial  Direction

B. Transverse  Direction

a. Location of the No.1 Piston Ring at TDC
b. Location of the Piston BDC
c. Location of the Oil Ring at BDC

Chamfer Angle

Wear Limit in Longitudinal and Transverse Direction

Permissible Deviation of Cylinder Out-of-round

Permissible Deviation of Rectangular Cylinder Height (Except Chamfered Area)

Basic Peak-to-valley Height After Final Honing and Brushing

Chamfer Angle

Honing Angle

When new

Wear limit

0.1 mm

0.007 mm

0.05 mm

0.05 mm

0.003 - 0.006 mm

75°

50° ± 10°

1)

 The group code letters are carved on the surface of the piston crown and in the mating surface of the crankcase.

Type

Standard Size

E20 : 

f

 

89.9

E23 : 

f

 

90.9

1st Repair Size

(Standard Size + 0.25)

2nd Repair Size

(Standard Size + 0.5)

Group Code Letter

1)

A

X

B

A

X

B

A

X

B

Cylinder Bore Size (mm)

f

 89.900 - 

f

 90.906

f

 89.906 - 

f

 89.912

f

 89.912 - 

f

 

89.918

f

 90.150 - 

f

 90.156

f

 89.156 - 

f

 

90.162

f

 90.162 - 

f

 

90.168

f

 90.400 - 

f

 

90.406

f

 90.406 - 

f

 

90.412

f

 90.412 - 

f

 90.418

1B2-110  M161 ENGINE MECHANICAL

CRANKCASE MATING SURFACE

Service Data Standard

Height of the Crankcase “H” (When New)

Minimum Height After Milling

Flatness

Permissible Deviation of Parallelism of the

Upper to Lower Mating Surface

Peak-to-valley Height

Crankcase Upper Mating Surface

Crankcase Lower Mating Surface

Axial Direction

Transverse Direction

Crankcase Upper Mating Surface

Crankcase Lower Mating Surface

289.35 - 289.45mm

289.05mm

0.03mm

0.04mm

0.1mm

0.05mm

0.012 - 0.009mm

0.025 - 0.020mm

M161 ENGINE MECHANICAL  1B2-111

Chamfering Procedure

1. Chamfer angle : 75°

2. Polish the lower chamfered area evenly with a grinder after

finishing the chamfering with a suitable tool (e.g., hand milling
cutter).