Alamarin Jet COMBI-FRAME AJ 285 Repair Manual page 36

Figure 42. Adjuster sleeve
Find the right sleeve thickness by testing as follows:
3. Lubricate the shaft and the inner surface of the impeller mounting flange
with waterproof petroleum jelly (such as Shell Gadus S2 V220AC or
similar).
4. Place the impeller into the duct and push it against the shim rings.
5. Measure the gap on the impeller outer race.
If the front surface of the impeller hub does not reach the shim rings, add
more shim rings.
The optimal gap is 0.8–1.2 mm (approx. 0.031–0.047") at the upper part
of the duct. When you measure the gap, note that the shaft is not centred
when the stator is removed, but the shaft's rear end hangs low and the
whole gap is visible in the upper part of the duct.
6. Once you have found the right adjuster sleeve length, place they key
lubricated with waterproof petroleum jelly (such as Shell Gadus S2
V220AC or similar) in the shaft keyway (figure 43) and push the impeller
onto the shaft against the adjuster sleeve.
32
CAUTION!
If the gap is too big, it will cause loss of power and reduce
performance.
Impeller
Repair manual
KM/285/EN/1.1.0