Doosan DB33A, Руководство по обслуживанию, Страница: 35 / 78

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2.3.3. Valve Spring
Valve Spring Free Length
Use a vernier caliper to measure the valve spring free
length.
If the measured value is less than the specified limit,
the valve spring must be replaced.
Free
length
Exhaust and Intake
Valve Spring Free
Length
Standard
49.0 mm
(1.93 in)
52.4 mm
(2.06 in)
53.6 mm
(2.11 in)
Standard
14.5 kg
(32 lbs)
10.9 kg
(24 lbs)
23.0 kg
(50.7 lbs)
Limit
11.5 kg
(25.4 lbs)
9.9 kg
(21.8 lbs)
20.0 kg
(44.1 lbs)
Limit
47.0 mm
(1.85 in)
50.0 mm
(1.97 in)
50.6 mm
(1.99 in)
Inner
Outer
Remark
for
Industrial
for
Automotive
Free
length
Valve spring
Inclination
Standard
less than
1.3 mm
(.051 in)
-
-
Limit
2.7 mm
(.106 in)
1.0 mm
(.039 in)
1.0 mm
(.039 in)
Inner
Outer
Remark
for
Industrial
for
Automotive
Valve Spring
Tension at 40 mm
Set Length
42mm
(1.65 in)
44mm
(1.73 in)
Remark
for
Industrial
for
Automotive
Valve Spring Inclenation
Use a surface plate and a square to measure the
valve spring inclination.
If the measured value exceeds the specified limit, the
valve spring must be replaced.
Inner
Outer
Valve Spring Tension
Use a spring tester to measure the valve spring tension
if the measured value is less than the specified limit, the
valve spring must be replaced.
2.3.4. Tappet
Inspect the tappets for excessive wear, damage and
any abnormalities.
Inclination
Square
Spring tester
Pitted
Crack normal contact
Abnormal contact
Free
length