Inspection And Repair - Mitsubishi 4DQ3 Service Manual

Cylinder head
(I) 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 surface s. 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
Item
Warpage of gasketed
surface of cylinder
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
(1/4 in.) diameter fnserted through glow plug hole,
as shown.
A-Intake port
a-Exhaust port

INSPECTION AND REPAIR

Unit: mm (in.)
Standard Repair limit
0.20
0.05,max
(0.0079)
(0.0020)
C·Jet
I
C
Checking cylinder head gasketed surface for flatness
Removing precombustion chamber jet
Direction of precombustion chamber jet
orifice in installed state
I
E
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