Mitsubishi 4DQ5 Service Manual download pdf (Page 30)

(4)

To

~he.:k

the rod with a piston,

pla~e

the rod on

the

surfa~e

plate

as

shown below, insert a

round bar

of

the

~rankpin

diameter into and

through its big end bore, and take measurement

at

"A"

and

"B."

The differen.:e between the two

measurements

tel1s

the straighteness

of

the rod.

When

one or more, or

all

connecting rods are to

be

repla~ed,

sele~t

new rods

so

that the variance

in

weight among the rods

is

within the value

given

in

the spedfication.

Specification

Unit: gram (oz)

Variance

in

weight

among connecting rods

(5) Check the connecting rod end

playas

follows:

Check each connecting rod for end play in the

manner illustrated, with the cap bolts tightened

to 5.5

kg-m

(39.8 lb-ft).

Use

a thickness

gauge

to

measure the end play (which

is

the clearance between

big end and crank arm).

If

the clearance measured

exceeds the service limit, replace the connecting

rod or bearing.

Specifications

Unit:

mm

(in.)

Item

Standard

Service

limit

Connecting rod

0.15

--

0.35

0.50

end play

(0.0059"" 0.0138)

(0.0197)

(6) Check the bearings

as

follows:

(a) Inspect each bearing for evidence

of

wiping or

fatigue failure, for scratches by dirt particles

imbedded in and for improper seating

on

the

bore. Determine whether the bearing should

be re-used

or

replaced on the basis

of

fmdings.

(b) Check the radial clearance between crankpin

and bearing;

if

the repair limit speCified below

is

exceeded

by

the checked clearance, replace

the bearing. Where the crankpin

is

to

be ground

to

the next undersize,

use

a replacement bear-

ing

of

that

undersize.

The two bearing undersizes are 0.25 mm

(0.00984 in.) and 0.50 mm (0.01969 in.).

-26-

A

B

//

/

Checking connecting rod on surface plate

Checking end

play of connecting rod

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