Mitsubishi S4L User Manual

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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
ENGLISH
CYLINDER HEAD AND VALVE
MECHANISM
INSPECTION
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17.3 Valve springs
Check the squareness and free length. If the
squareness and/or free length exceeds the limit,
replace the spring.
Unit: mm (in.)
17.4 Valve push rods
Using V-blocks and a dial indicator, check for bend. If
the bend exceeds the limit, replace the push rod.
Unit: mm (in.)
17.5 Valves, valve guides and valve
seats
1. Diameter of valve stem
Measure the diameter of the valve stem as shown
in the illustration. If the stem is worn beyond the
limit, or if it is abnormally worn, replace the valve.
Unit: mm (in.)
Figure 66 Testing valve spring
Squareness
Free length
Item Standard Limit
Free length 47 (1.85) 46 (1.81)
Squareness 1.5° maximum
Test force,
kgf (lbf) [N]
Length under
test force:
39.1 (1.54)
13.9 ± 0.7
(30.6 ± 1.5)
[136 ± 7]
–15%
Length under
test force:
30.5 (1.20)
29 ± 2
(64 ± 4.4)
[284 ± 20]
Figure 67 Checking bend of valve push rod
Item Limit
Bend (dial indicator reading) of valve
push rod
0.3 (0.012)
maximum
Figure 68 Measuring valve stem
Measuring
diagram
Item
Nominal
size
Standard Limit
Diameter
of valve
stem
Inlet
valve
6.6
(0.260)
6.565 to
6.580
(0.258 46 to
0.259 05)
6.500
(0.255 91)
Exhaust
valve
6.6
(0.260)
6.530 to
6.550
(0.257 09 to
0.257 87

Mitsubishi S4L Specifications

General

Brand	Mitsubishi
Model	S4L
Category	Engine
Language	English