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Mitsubishi 4DQ5 Service Manual Page 70

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Page view 69
6-2
Inspection
(1) Check valve
Inspect the seating faces
of
the check valve for
wear, and replace parts found in abnormally or
excessively worn condition.
(2) Tappet wear
Mike the tappet and tappet hole
to
determine
their diametral wear. Replacement
is
necessary
if
the amount
of
wear noted in comparison with the
standard diameter is
0.1
mm
(0.004 in.)
otmore.
Specifications Unit: mm (in.)
Item
Standard
Service
limit
Tappet
OD
20 (0.78)
0.1
(0.004)
Tappet hole ID
20 (0.78)
0.1
(0.004)
The overall play
of
tappet roller pin, involving the
pin hole and roller, is prescribed
to
be
not
greater
than
0.3 mm (0.012 in.).
If
this limit
is
exceeded,
the whole tappet sub-assembly must
be replaced.
Replace the roller
if
its diameter has worn down
to
the service limit.
Specifications
Unit: mm (in.)
Item Standard
Service
limit
+0
Tappet roller OD
15
-0.027
-0.075
(0.591
j.00106)
(-0.00295)
(3)
Pump housing damage
Inspect the housing for cracks, broken screw
threads and other types
of
damage and repair
or
replace it
as
necessary.
(4) Priming
pump
wear
Inspect the piston and cylinder for scratch marks,
wear and rusting.
Check the seating faces
of
its
valve
for wear. An excessively worn or damaged
seating face must be corrected by replacement.
-66
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