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Mitsubishi 4DQ5 Service Manual Page 20

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INSPECTION AND REPAIR
Cylinder head
(1) Inspection
Check the gasketed surface
of
the cylinder head for
flatness
by
using a straightedge and thickness
gauge
as
in the case
of
checking the crankcase surfaces. This
check is
to
be made with the precombustion chamber
jets removed.
Use
a surface grinder
to
reface the cylinder head,
as
necessary,
to
the specified flatness.
Specifications Unit: mm (in.)
Item
Standard
Repair limit
Warpage
of
gasketed
O.OS,max
0.20
surface
of
cylinder
(0.0020)
(0.0079)
head
(2) Precombustion chamber
jet
replacement
Do
not remove the jets unless they have to be
re-
placed. To remove the
jet
as
when cracks are noted
in
it, drive it
out
with a drift pin
of
about 6 mm
0/4 in.) diameter inserted through glow plug hole,
as
shown.
A·lntake
port
C·Jet
B-Exhaust
port
-16
-
B-
L...::t=---
.....
--_
....
~
...
·F
I
o
Checking cylinder head gasketed surface for flatness
Removing precombustion chamber jet
©
Direction of precombustion chamber jet
orifice
in
installed state
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