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FORWARD SEALING
The forward sealing has the same construction as the aft sealing, however, instead of the rubber
sleeve, simple sealing rings are used as it is known from experience that the front end bearing is
never worn worth mentioning.
The forward sealing consists of a casing (1). In this casing two sealing rings (2) and two supporting
rings are retained by means of a seeger circlip (5). The two sealing rings are running on a chromium
steel bush (6) which by means of the clamp ring (13) runs around with the shaft.
The lips of the sealing rings are pressed firmly on the chromium steel bush by means of a spring and
the oil pressure from the sterntube. The sealing against oil from the sterntube is always guaranteed.
In order to ensure a long lifetime, the foremost ring is used first and afterwards the adjacent one,
simply by shutting the needle valve (9). The second sealing ring which has constantly been
uncharged and well cooled, takes over the sealing immediately.
In order to avoid leackages between the propeller shaft and the chromium steel bush a rubber ring
(7) is pressed in between the clamping ring and the shaft.
Repair of the chromium steel bush
In case of repair the chromium steel bush of the fore- and after packing gland can be ready
machined and polished to a minimum diameter (A-P); the spring in the sealing rings can then be
shortened in length by max. 5%.
Type A
P max.
155
1,5
170
1,5
190
1,5
200
1,5
Callesen Diesel
Q
Max.
Min.
0,2
0,4
Page 3 af 6
7-93-2A
Sheet No.
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