Carrier CT2-29-TV Workshop Manual page 47

2.3.1 Cylinder Head And Valves (Continued)
2.3.1.i Free Length and Tilt of Valve Spring
1. Measure the free length (A) of the valve spring with
vernier calipers. If the measurement is less than the
allowable limit, replace the spring.
2. Put the valve spring on a surface plate, place a
square on the side of the valve spring.
3. Check to see if the entire side is in contact with the
square. Rotate the spring and measure for maximum
tilt (B). Check the entire surface of the valve spring for
defects. If any are found, replace it.
Specification
Free Length (A)
Allowable Limit
Tilt (B) Allowable Limit
2.3.1.j Valve Spring Setting Load
1. Place the valve spring on a tester and compress it to
the same length it's actually compressed in the en-
gine.
2. Read the compression load on the gauge.
3. If the measurement is less than the allowable limit, re-
place it.
Specification
Setting Load /
Setting Length
2.3.1.k Oil Clearance Between Rocker Arm and
Rocker Arm Shaft
1. Measure the rocker arm shaft O.D. with an outside
micrometer.
2. Measure the rocker arm I.D. with a inside micrometer,
then calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, re-
place the rocker arm then measure the oil clearance
again. If the clearance is still out of specification, re-
place the rocker arm shaft.
Oil Clearance
Specification
Rocker Arm/
Shaft
Rocker Arm
Shaft O.D. Specification
Rocker Arm I.D.
Specification
2--23
Factory 31.3 to 31.8 mm
1.232 to 1.252 in.
28.4 mm
1.118 in.
1.2 mm
0.047 in.
64.7 N / 27.0 mm
Factory
6.6 kgf / 27.0 mm.
14.6 lbs. / 1.063 in.
54.9 N / 27.0 mm
Allowable
5.6 kgf / 27.0 mm.
Limit
12.3 lbs. / 1.063 in.
Factory 0.016 to 0.045 mm
0.00063 to 0.00177 in.
Allowable 0.15 mm
Limit 0.0059 in.
Factory 10.473 to 10.484 mm
0.41232 to 0.41276 in.
Factory 10.500 to 10.518 mm
0.41339 to 0.41410 in.
62--11161