Mitsubishi 4DQ5 Service Manual download pdf (Page 31)

Specifications

Unit:

mm

(in.)

Item Standard

Repair

limit

58

-0.035

Crankpin diameter

-0.055

(2283

-0.00138)

.

-0.00217

Radial clearance

0.035

....,

0.100

0.20

between bearing

and crankpin

(0.00138"'" 0.00394)

(0.0079)

To measure the inside diameter

of

the bearing,

the bearing fitted to each connecting rod must

be

secured by tightening the cap bolts to

5.5

kg·m (39.8 lb·ft). Measure the diameter

in

two

positions, 1 and 2, and in two directions

D\

and D2,

as

shown below. Obtain the average by the follow·

ing formula:

....

r.1:":<:':"'~

2

1

01 +

02

0----

2

Positions for miking connecting rod bearing

(c)

Check the contact pattern

of

bearing on

crankpin by fitting the big end

in

the normal

manner to the crankpin, with the crankshaft

laid

out

on the bench, and by using a paste

of

red lead or Prussian blue to visualize the con-

tact.

Be

sure to tighten the cap bolts to the

specified torque, that is,5.5

kg·m (39.8 lb·ft). The

contact should occur over at least

75%

of

the

entire surface;

if

not, replace the bearing.

[NOTE]

The above job

of

checking the contact pattern

may be eliminated where the crankpin

is

ground

to the specified tolerance and the bearing has

been replaced. This

is

because a replacement

bearing

is

precision·finished

to

ensure the speci·

fied extent

of

contact.

-27

-

Miking

connecting rod bearing

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