Volvo B 21 - Ring Gear Replacement Procedure

Group 21 Reco nd it ionin g engi ne
Cleaning, inspect ion
Replaeing ring gear
Operat ions C22- 26
Heat new ring geer to 2300C (450° FI
C22
Heat ring gear in an aven or wi th an oxycetylene torch.
If aven is to be used, begin heating at this stage.
Orm e hale between two eogs .
Use an 10 mm (0.4 in) drill.
Depth - 9 mm (0.35 in).
C23
Importent: 00 not drill into flywneel as tnis mav cau se
ou l-of-balance.
C24
Remove ring ge8r
Mount flywheel in a vice protected by soft jaws.
lever off ring gear with a screwd river. It may be neces·
sary to split ring gear above dri lled hale.
Clean
mating surfaces on fl ywhee l.
C25
Heat new ring gear to 2300C 14500f1
Check t empe rat ure with solder (40% l in, 60% lead) 501-
der melts at 220- 230°C (430- 450"F).
C26
Install new ring ge8r
Importent; Bevelted side of ring geer must face flywheel.
If
necessary tap ring gear until flush wi th f lywnee l,
using a brass drift.
l eave to cool.
29