Mitsubishi 4DQ5 Service Manual download pdf (Page 22)

Valve refacer

(a)

Set a valve refacer

angle

45 degrees.

(b) Grind the valve stock

a minimum and,

the

margin

less than

1.2

mm (0.047 in.), replace

the valve.

Valve seat cutter

Repair

excessively worn

valve

seat by using a

valve

seat grinder

valve

seat cutter.

(c)

When

using a valve seat cutter, exercise

care

to apply a uniform pressure to

valve

seat to

prevent uneven cutting. After cutting, reface

the seat by rotating the cutter with No.

400

sandpaper put between the cutter and seat.

(d)

valve

seat width is overcut,

repair

it using a

30-degree cutter.

valve

seat width exceeds

1.6

(0.063 in.) due to wear,

rep.lace

the

seat. Also replace the seat when

valve

sinkage

exceeds

1.3

(0.051 in.).

Valve

seat

installation

Chill the valve seat inserts in ether or alcohol containing

dry ice. Heat the cylinder head to a temperature

80°C

to 100°C (176°p to 212°p). Press the inserts

the

cylinder head by using the insert calking tools (30691-

02700 for intake valve, 30691-02800 for exhaust valve).

Leave the cylinder head and the inserts in the air until

shrinkage-expansion fit

obtained between the two.

Calk around the inserts with the insert calking tool to

machine the seat width.

(NOTE]

The insert calking tool may be used

both

for

pressing and calking the

valve

seat inserts

reversing the calking ring.

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Mitsubishi 4DQ5 Service Manual Page 22

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