Isuzu KB P190. Manual — part 524

6A-82 ENGINE MECHANICAL (C24SE)

Crankshaft, Cylinder Block

Cylinder Grinding and Piston Dimensions

Size

Cylinder bore dia. in mm

Cylinder to

Related piston dia. in mm Piston head

Crankshaft

co-

efficient

housing

co-efficient

over

to over

to

Production

(2.4L)

1 87.48

87.49

87.49
87.50

99
00

87.46
87.47

87.47
87.48

99
00

Customer

service

(2.4L)

-

87.99 88.00 0+0.5 87.97 87.98 7+0.5

Piston diameter must be measured at the position "D".

*inclusive

Cylinder Bore

Rebore cylinder Permissible oversize to 0.5mm (see parts

microfiche)

After reboring, invalidate original crankcase
housing coefficient and drive in new oversize
coefficient

Permissible

out-of-round:

0.013mm

Permissible

taper:

0.013mm

Measure out-of-round in bore at 4 different
heights

Piston projection above upper edge of cylinder block

0.40mm

Piston

Type Recessed

pistons

Clearance

For short-blocks and cylinder blocks with
complete pistons, the clearance is 0.02 to
0.04mm

For replacement (oversize), depending on
available pistons, a clearance of 0.02 to
0.04mm is permissible

ENGINE MECHANICAL (C24SE) 6A-83

Crankshaft, Cylinder Block (continued)

Piston Rings

2.4L

Square ring

Height

mm

1.2

Tapered ring Height

mm

1.5

Oil scraper

Height

mm

2.5

Ring gap offset

180

°

Note that the upper steel band ring gap is offset 25 to 50mm to
the left and the lower 25 to 50mm to the right opposite the
intermediate ring gap.

Piston Pin

Length mm

61.5

Diameter mm

21

Type

Shrunk into con-rod

Play

mm

2.4L

in

piston

0.010-0.015

in

con-rod

none

Installation

When installing piston pins,
heat con-rods to approx.
280

°C in oil bath. This

temperature should under no
circumstances be exceeded.

Crankshaft, Cylinder Block (continued)

The permissible weight variation of con-rods without piston and
bearing shell inside an engine is 8 g.
As the con-rods do not have balancing studs, reworking is not
possible.
Con-rods can only be replaced in sets.

6A-84 ENGINE MECHANICAL (C24SE)

Crankshaft, Cylinder Block (continued)

Crankshaft

jounal

I, II, IV, V

Guide

bearing

III

Con-rod journal

1 to 4

Con-rod width

Diameter

mm

Widtht

mm

Diameter

mm

Width

mm

mm

Normal

size

Bearing journal and colour code

from

57.9820 green

to 57.9885

> 57.9885

brown

to 57.9950

25.900

25.850

48.988

48.970

26.580

26.460

26.390

26.338

Bearing shell identification mark

Colour code and embossed

Crankshaft bearing

I, II, IV, V

Guide bearing

III

Con-rod bearing

1 to 4

Identification mark

brown-662N

green-663N

brown-655N

green-658N

Crankshaft

jounal

I, II, IV, V

Guide

bearing

III

Con-rod journal

1 to 4

Con-rod width

Diameter

mm

Widtht

mm

Diameter

mm

Width

mm

mm

0.25mm Undersize for Production and Customer Service

Bearing journal and colour code

from

57.7320 green/

to 57.7385

blue

> 57.7385

brown/

to 57.7450

blue

26.100

26.050

48.738

48.720

26.580

26.460

Bearing shell identification mark

Colour code and embossed

Crankshaft bearing

I, II, IV, V

Guide bearing

III

Con-rod bearing

1 to 4

Identification mark

brown/blue-664 A

green/blue-655 A

brown/blue-657 A

green/blue-658 A

Crankshaft

jounal

I, II, IV, V

Guide

bearing

III

Con-rod journal

1 to 4

Con-rod width

Diameter

mm

Widtht

mm

Diameter

mm

Width

mm

mm

0.50mm Undersize Customer Service

Bearing journal and colour code

from

57.4820 green/

to 57.4885

blue

> 57.4885

brown/

to 57.4950

blue

26.300

26.250

48.488

48.470

26.580

26.460

Bearing shell identification mark

Colour code and embossed

Crankshaft bearing

I, II, IV, V

Guide bearing

III

Con-rod bearing

1 to 4

Identification mark

brown/white-666 B

green/white-667 B

brown/blue-659 B

green/blue-660 B

ENGINE MECHANICAL (C24SE) 6A-85

Piston Pins

Dimensions

Length mm

Diameter mm

61.5

21

Type

Shank-fit in con-rod

Clearance

In piston

mm

In con-rod

mm

2.4L

0.010 to 0.015

0

Installation

See operation “Con-rod, Replace”