Valve Springs; Valve Push Rods; Valves, Valve Guides And Valve Seats - Mitsubishi S3L Service Manual

CYLINDER HEAD AND VALVE
MECHANISM
Squareness
Free length
Figure 66 Testing valve spring
Figure 67 Checking bend of valve push rod
Figure 68 Measuring valve stem
60 / 195 60 / 195

17.3 Valve springs

Check the squareness and free length. If the
squareness and/or free length exceeds the limit,
replace the spring.
Free length
Squareness

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.
Bend (dial indicator reading) of valve
17.5 Valves, valve guides and valve
Measuring
diagram
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.
Diameter
of valve
stem
ENGLISH
Item Standard
47 (1.85)
1.5° maximum
Length under 13.9 ± 0.7
test force: (30.6 ± 1.5)
39.1 (1.54) [136 ± 7]
Length under 29 ± 2
test force: (64 ± 4.4)
30.5 (1.20) [284 ± 20]
Item
push rod
seats
Nominal
Item
size
Inlet 6.6
valve (0.260)
Exhaust 6.6
valve (0.260)
Service Manual Mitsubishi SL-Series diesel engines
INSPECTION
Unit: mm (in.)
Limit
46 (1.81)
–15%
Unit: mm (in.)
Limit
0.3 (0.012)
maximum
Unit: mm (in.)
Standard Limit
6.565 to
6.580
(0.258 46 to
0.259 05)
6.500
(0.255 91)
6.530 to
6.550
(0.257 09 to
0.257 87
Version 08/2004