Cub Cadet Challenger Series Service Manual page 52

Valve Dimensions
Head diameter
"A" head diameter
"B" face width
"C" seat width
"D" margin thickness
Stem outside diameter
Guide inside diameter
550 UV Engine Specifications
IN EX
Clockwise
face width
IN 39.9- 40.1 mm
(1.5709~1.5787 in)
3 3.9 - 33 .98 mm
EX
(1.3346~1.3378 in)
2.25 mrn (0.0900 in)
IN
2 .26 mm
(0.0890in)
EX
0.9~1.1mm
(0.0354~0.0433in)
IN
0. 9 - 1.1
(0.0354~0.0433in)
EX
0.85 - 1.15mm
(0.0335~0.0453in )
IN
0.85~1.315mm
(0.0335~0.0453in)
EX
5.975~5.990mm
(0.2352~0.2358in)
IN
5.960~5.975mm
(0.2346~0.2352in)
EX
6.000~6.012mm
IN (0.2362~0.2367in)
6.000~6.012mm
EX
(0.2362~0.2367in)
2-11
seat width
mm
Margin thickness
1.6mm
(0.0630in)
1.6mrn
(0.0630in)
5.945 mm
(0.2341in)
5.930 mm
(0.2355in)
6.050mm
(0.2559in)
6.050 mm
(0.2559in)