Rotax 914 F Maintenance Manual page 263

Designation
2 nd compression ring (bevel-edged)
height of groove ...................................... 1,27 ÷ 1,29
height of ring ........................................... 1,228 ÷ 1,24
ring / groove clearance ........................... 0,03 ÷ 0,062
ring end gap F ....................................... 0,3
rd
3 ring (oil scraper ring)
height of groove ...................................... 3,01 ÷ 3,03
height of ring ........................................... 2,975 ÷ 2,99
ring / groove clearance ........................... 0,02 ÷ 0,045
ring end gap F ....................................... 0,15 ÷ 0,40
Cylinder head 1
wear on valve seat .................................. 0
valve guide bore o ................................. 7,006 ÷ 7,018
valve stem p ......................................... 6,965 ÷ 6,98
stem clearance ....................................... 0,026 ÷ 0,053
sealing face width, inlet valve [ ............ 1,40 ÷ 2,00
sealing face width, exhaust valve [ ...... 1,50 ÷ 1,90
out-of-true on valve head ] .................... 0,00 ÷ 0,01
rocker arm bore S ................................ 12,000 ÷ 12,027
rocker arm shaft ................................... 11,983 ÷ 11,994
rocker arm, radial clearance .................... 0,006 ÷ 0,035
depth of wear on contact face of valve stem . 0
free length, inner spring A .................... 35,0
A .......................................................... 37,0
spring rate, inner spring ........................ 13,25
spring rate, outer spring ........................ 33,25
Cylinder head 2
wear on valve seat .................................. 0
valve guide bore o ................................. 7,006 ÷ 7,018
valve stem p ......................................... 6,965 ÷ 6,98
stem clearance ....................................... 0,026 ÷ 0,053
sealing face width, inlet valve [ ............ 1,40 ÷ 2,00
sealing face width, exhaust valve [ ...... 1,50 ÷ 1,90
out-of-true on valve head ] .................... 0,00 ÷ 0,01
rocker arm bore S ................................ 12,000 ÷ 12,027
rocker arm shaft ................................... 11,983 ÷ 11,994
rocker arm, radial clearance .................... 0,006 ÷ 0,035
depth of wear on contact face of valve stem . 0
free length, inner spring A .................... 35,0
A .......................................................... 37,0
spring rate, inner spring ........................ 13,25
spring rate, outer spring ........................ 33,25
Cylinder head 3
wear on valve seat .................................. 0
valve guide bore o ................................. 7,006 ÷ 7,018
valve stem p ......................................... 6,965 ÷ 6,98
stem clearance ....................................... 0,026 ÷ 0,053
sealing face width, inlet valve [ ............ 1,40 ÷ 2,00
sealing face width, exhaust valve [ ...... 1,50 ÷ 1,90
out-of-true on valve head ] .................... 0,00 ÷ 0,01
Modification no.
- 3 -
new
mm (in.)
(0,050÷0,051) .............. 1,35 (0,053) ........................
(0,048÷0,049) .............. 1,20 (0,047) ........................
(0,001÷0,002) .............. 0,1
÷ 0,5 (0,011÷0,02) ................ 1,0
(0,118 ÷0,119) ............ 3,1
(0,117 ÷0,118) ............ 2,95 (0,116) ........................
(0,0008÷0,002) ............ 0,1
(0,006 ÷0,016) ............ 1,0
........... max. 0,3
(0,275÷0,276) .............. 7,15 (0,282) ........................
(0,274÷0,275) .............. 6,94 (0,273) ........................
(0,001÷0,002) .............. 0,15 (0,006) ........................
(0,055 ÷ 0,079) ............ 2,40 (0,094) ........................
(0,059 ÷ 0,075) ............ 2,50 (0,098) ........................
(0,0 ÷ 0,0004) ........... 0,03 (0,0012) ......................
(0,472÷0,4735) .......... 12,09 (0,476) ........................
(0,471÷0,472) ............ 11,95 (0,470) ........................
(0,0002÷0,001) ............ 0,10 (0,004) ........................
.................... 0,25 (0,01) ..........................
(1,378) 34,0 ................ (1,338) free length, outer spring
(1,457) 36,0 ................ (1,417)
N/mm ......................
N/mm ......................
........... max. 0,3
(0,275÷0,276) .............. 7,15 (0,282) ........................
(0,274÷0,275) .............. 6,94 (0,273) ........................
(0,001÷0,002) .............. 0,15 (0,006) ........................
(0,055 ÷ 0,079) ............ 2,40 (0,094) ........................
(0,059 ÷ 0,075) ............ 2,50 (0,098) ........................
(0,0 ÷ 0,0004) ........... 0,03 (0,0012) ......................
(0,472÷0,4735) .......... 12,15 (0,478) ........................
(0,471÷0,472) ............ 11,95 (0,470) ........................
(0,0002÷0,001) ............ 0,15 (0,006) ........................
.................... 0,25 (0,01) ..........................
(1,378) 34,0 ................ (1,338) free length, outer spring
(1,457) 36,0 ................ (1,417)
N/mm ......................
N/mm ......................
........... max. 0,3
(0,275÷0,276) .............. 7,15 (0,282) ........................
(0,274÷0,275) .............. 6,94 (0,273) ........................
(0,001÷0,002) .............. 0,15 (0,006) ........................
(0,055 ÷ 0,079) ............ 2,40 (0,094) ........................
(0,059 ÷ 0,075) ............ 2,50 (0,098) ........................
(0,0 ÷ 0,0004) ........... 0,03 (0,0012) ......................
Reference
wear limit actual dim.
mm (in.) int. / exh.
(0,004) ........................
(0,04) ..........................
(0,122) ........................
(0,004) ........................
(0,04) ..........................
(0,012) ........................
................................
................................
(0,012) ........................
................................
................................
(0,012) ........................
Main Date
1999 01 01
914 F
Page
263