Fluid Coupling Bellows Gland - To remove and refit from BUT manual
(refer to pictures: section through A-type or L-type, exploded view of L-type, and part cut away.)
To Remove
If the bellows gland is found to be leaking it should be renewed as follows:
- Drain the coupling.
- Disconnect the freewheel unit from the coupling flange on the runner shaft.
- Remove the split-pin, nut and washer, and draw the coupling flange off the runner shaft with a suitable withdrawal tool.
- Break locking wire and remove setscrews securing the oil seal to the rear casing.
- Remove the stiffener ring, joint, bellows gland, adapter ring together with joint, and the rubbing ring. On the L-type engine a distance-piece has to be removed first before the rubbing ring can be taken off the shaft. Care must be taken when handling the bellows gland oil seal. It is important that the bellows and the highly polished faces of the rubbing ring and the bellows gland seal ring are not damaged; the slightest scratch across the faces will destroy the efficiency of the seal.
To Refit
Reverse the procedure given for removal, noting the following points:-
- Smear with non-hardening jointing compound the abutting faces of the adapter ring and bearing, rubbing ring and coupling flange and the abutting faces of the rubbing ring, spacer and coupling flange in the case of the L-type engine. Also smear the splined end of the runner shaft and the abutting faces of the coupling retaining washer and nut.
- Smear the polished joint face of the seal with clean engine oil.
- Fit a new paper joint between the adapter ring and the flange of the oil seal and between the abutting faces of the adapter ring and bearing. Note: it is important that the rubbing ring be assembled with the polished face towards the splined end of the runner shaft, and on no account must jointing compound be allowed to come into contact with this polished face and its mating face.
- Fit the coupling flange to the runner shaft and connect the freewheel.
- Fill the fluid coupling with oil.