Valve Spring Free Length; Valve Spring Inclenation; Valve Spring Tension - Doosan DB33A Service Manual

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.
Exhaust and Intake
Valve Spring Free
Length
Inner
Free
length
Outer

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.
Valve spring
Inclination
Inner
Free
length
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.
Valve Spring
Tension at 40 mm
Set Length
42mm
Inner
(1.65 in)
44mm
Outer
(1.73 in)
2.3.4. Tappet
Inspect the tappets for excessive wear, damage and
any abnormalities.
Limit
Standard
49.0 mm 47.0 mm
(1.85 in)
(1.93 in)
50.0 mm
52.4 mm
(1.97 in)
(2.06 in)
50.6 mm
53.6 mm
(1.99 in)
(2.11 in)
Limit
Standard
less than
2.7 mm
1.3 mm
(.051 in)
(.106 in)
1.0 mm
-
(.039 in)
1.0 mm
-
(.039 in)
Standard Limit
14.5 kg 11.5 kg
(32 lbs) (25.4 lbs)
10.9 kg 9.9 kg
(24 lbs) (21.8 lbs)
23.0 kg 20.0 kg
(50.7 lbs) (44.1 lbs)
Remark
for
Industrial
for
Automotive
Remark
for
Industrial
for
Automotive
Remark
for
Industrial
for
Automotive
31
Inclination
Free
length
Square
Spring tester
Pitted
Crack
Abnormal contact
normal contact