Mitsubishi diesel engines, Service Manual, Page: 64 / 219

ENGINE MAIN PARTS - INSPECTION AND CORRECTION
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1.4 Measuring the push rod for bend
If the measured value exceeds the limit, replace
the push rod.
Unit: mm (in.)
Limit
Push rod bend 0.3 (0.012)
Note: Use a dial gauge to measure the push rod for
bend.
1.5 Measuring the valve stem diameter
Measure the valve stem diameter. If the
measured value is less than the limit, replace with
a new part. Replace also when the valve stem has
excessively uneven wear.
Unit: mm (in.)
Nominal
value
Standard
value
Limit
Inlet
φ
6.6
(0.260)
6.565
to 6.580
(0.2586
to 0.2592)
6.500
(0.256)
Valve stem
diameter
Exhaust
φ
6.6
(0.260)
6.530
to 6.550
(0.2572
to 0.2580)
6.500
(0.256)
1.6 Measuring the clearance between the
valve stem and guide
Measure the valve guide inner diameter using an
inside micrometer.
The valve guide wears at the top and bottom ends.
Therefore, both ends need to be measured
orthogonally. If the measured value exceeds the
limit, replace with a new part.
Unit: mm (in.)
Nominal
value
Standard
value
Limit
Inlet
―
0.020
to 0.050
(0.0008
to 0.002)
0.100
(0.004)
Valve stem
-to-guide
clearance
Exhaust
―
0.050
to 0.085
(0.002
to 0.003)
0.150
(0.006)
Installed valve guide
protrusion 10
(0.394)
9.5 to 10.5
(0.3743
to 0.4137)
―
Note: Before measuring the valve stem-to-guide
clearance, remove carbon from the valve and the
valve guide.
Measuring the valve stem diameter
Measuring the push rod bend
1/2 1/2
Push rod
Measuring the valve guide inner diameter
Measuring
direction
Measuring
location
Inside micrometer
Measuring
direction
Measuring
location