Rotax 914 F User Manual

Reference
Modification no.
- 3 -
Page
263
Date
1999 01 01
Main
914 F
01480
Designation new wear limit actual dim.
mm (in.) mm (in.) int. / exh.
2
nd
compression ring (bevel-edged)
height of groove ...................................... 1,27 ÷ 1,29 (0,050÷0,051) .............. 1,35 (0,053) ........................
height of ring ........................................... 1,228 ÷ 1,24 (0,048÷0,049) .............. 1,20 (0,047) ........................
ring / groove clearance ........................... 0,03 ÷ 0,062 (0,001÷0,002) .............. 0,1 (0,004) ........................
ring end gap F ....................................... 0,3 ÷ 0,5 (0,011÷0,02) ................ 1,0 (0,04) ..........................
3
rd
ring (oil scraper ring)
height of groove ...................................... 3,01 ÷ 3,03 (0,118 ÷0,119) ............ 3,1 (0,122) ........................
height of ring ........................................... 2,975 ÷ 2,99 (0,117 ÷0,118) ............ 2,95 (0,116) ........................
ring / groove clearance ........................... 0,02 ÷ 0,045 (0,0008÷0,002) ............ 0,1 (0,004) ........................
ring end gap F ....................................... 0,15 ÷ 0,40 (0,006 ÷0,016) ............ 1,0 (0,04) ..........................
Cylinder head 1
wear on valve seat.................................. 0 ........... max. 0,3 (0,012) ........................
valve guide bore o ................................. 7,006 ÷ 7,018 (0,275÷0,276) .............. 7,15 (0,282) ........................
valve stem p ......................................... 6,965 ÷ 6,98 (0,274÷0,275) .............. 6,94 (0,273) ........................
stem clearance ....................................... 0,026 ÷ 0,053 (0,001÷0,002) .............. 0,15 (0,006) ........................
sealing face width, inlet valve [ ............ 1,40 ÷ 2,00 (0,055 ÷ 0,079) ............ 2,40 (0,094) ........................
sealing face width, exhaust valve [ ...... 1,50 ÷ 1,90 (0,059 ÷ 0,075) ............ 2,50 (0,098) ........................
out-of-true on valve head ].................... 0,00 ÷ 0,01 (0,0 ÷ 0,0004)........... 0,03 (0,0012) ......................
rocker arm bore S ................................ 12,000 ÷ 12,027 (0,472÷0,4735) .......... 12,09 (0,476) ........................
rocker arm shaft ................................... 11,983 ÷ 11,994 (0,471÷0,472) ............ 11,95 (0,470) ........................
rocker arm, radial clearance.................... 0,006 ÷ 0,035 (0,0002÷0,001) ............ 0,10 (0,004) ........................
depth of wear on contact face of valve stem . 0 .................... 0,25 (0,01) ..........................
free length, inner spring A .................... 35,0 (1,378) 34,0 ................ (1,338) free length, outer spring
A.......................................................... 37,0 (1,457) 36,0 ................ (1,417)
spring rate, inner spring ........................ 13,25 N/mm ...................... ................................
spring rate, outer spring ........................ 33,25 N/mm ...................... ................................
Cylinder head 2
wear on valve seat.................................. 0 ........... max. 0,3 (0,012) ........................
valve guide bore o ................................. 7,006 ÷ 7,018 (0,275÷0,276) .............. 7,15 (0,282) ........................
valve stem p ......................................... 6,965 ÷ 6,98 (0,274÷0,275) .............. 6,94 (0,273) ........................
stem clearance ....................................... 0,026 ÷ 0,053 (0,001÷0,002) .............. 0,15 (0,006) ........................
sealing face width, inlet valve [ ............ 1,40 ÷ 2,00 (0,055 ÷ 0,079) ............ 2,40 (0,094) ........................
sealing face width, exhaust valve [ ...... 1,50 ÷ 1,90 (0,059 ÷ 0,075) ............ 2,50 (0,098) ........................
out-of-true on valve head ].................... 0,00 ÷ 0,01 (0,0 ÷ 0,0004)........... 0,03 (0,0012) ......................
rocker arm bore S ................................ 12,000 ÷ 12,027 (0,472÷0,4735) .......... 12,15 (0,478) ........................
rocker arm shaft ................................... 11,983 ÷ 11,994 (0,471÷0,472) ............ 11,95 (0,470) ........................
rocker arm, radial clearance.................... 0,006 ÷ 0,035 (0,0002÷0,001) ............ 0,15 (0,006) ........................
depth of wear on contact face of valve stem . 0 .................... 0,25 (0,01) ..........................
free length, inner spring A .................... 35,0 (1,378) 34,0 ................ (1,338) free length, outer spring
A.......................................................... 37,0 (1,457) 36,0 ................ (1,417)
spring rate, inner spring ........................ 13,25 N/mm ...................... ................................
spring rate, outer spring ........................ 33,25 N/mm ...................... ................................
Cylinder head 3
wear on valve seat.................................. 0 ........... max. 0,3 (0,012) ........................
valve guide bore o ................................. 7,006 ÷ 7,018 (0,275÷0,276) .............. 7,15 (0,282) ........................
valve stem p ......................................... 6,965 ÷ 6,98 (0,274÷0,275) .............. 6,94 (0,273) ........................
stem clearance ....................................... 0,026 ÷ 0,053 (0,001÷0,002) .............. 0,15 (0,006) ........................
sealing face width, inlet valve [ ............ 1,40 ÷ 2,00 (0,055 ÷ 0,079) ............ 2,40 (0,094) ........................
sealing face width, exhaust valve [ ...... 1,50 ÷ 1,90 (0,059 ÷ 0,075) ............ 2,50 (0,098) ........................
out-of-true on valve head ].................... 0,00 ÷ 0,01 (0,0 ÷ 0,0004)........... 0,03 (0,0012) ......................

Rotax 914 F Specifications

General

Brand	Rotax
Model	914 F
Category	Engine
Language	English