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• Dimitris K

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SC3 S + SC3 Z Installation and Operating Manual TROUBLESHOOTING 7.6

Forward seal, Type Z

No. Problem

8

Forward seal is leaking during operation

Possible cause

Remedy

Misalignment of clamp ring (6) and liner (1)

•

Clamp ring (6) slipped.

9

Forward seal tank overflows.

Realign clamp ring (6) and liner (1).

Adjust clamp ring (6) first and fasten with screws (17), then fasten liner (1) by screws (15).

O-Ring (16) between liner and clampring leaky.

•

Replace O-ring (16).

Flat gasket (82) at flange ring (2) of aft seal leaky, damaged or not fasten.

•

Check flat gasket (82), replace if necessary.

Sealing rings V1 and V2 are • damaged due to wrong oil brand. •

Change oil brand in stern tube and in forward seal tank.

Sealing rings V1 and V2 are • damaged due to damaged liner (1) surface.

Remachine liner (1) if necessary.

Sealing ring V1 damaged.

Replace sealing rings V1 and V2 with bonding device.

a) At losses up to 1 % of the seal size in L/day: •

Observe oil level in gravity tank and refill if necessary.

b) At higher losses above 1 % of the seal size in l/d, to keep the seal in operation: •

Close all openings at tank of forward seal by plug.

The life time of sealing ring V2 under this conditions is limited!

Misalignment of clamp ring (6) and liner (1)

10

Forward seal tank oil level decreasing.

•

Replace sealing rings V1 and V2 of forward seal with bonding device.

•

Remachine forward liner (1) if necessary.

•

Realign clamp ring (6) and liner (1).

Clamp ring (6) of forward liner coming off or loose.

Adjust clamp ring (6) first and fasten with screws (17), then fasten liner (1) by screws (15).

Sealing ring V2 damaged.

•

Fill up forward seal tank with oil.

•

Replace sealing rings V1 and V2.

•

Remachine liner (1) if necessary.

SKF Marine GmbH Hermann-Blohm-Str. 5, 20457 Hamburg, GERMANY E_SC3 S + Z

Rev. 03.07.2017

187 / 189

SC3 S + SC3 Z Installation and Operating Manual TROUBLESHOOTING

11

12

Misalignment of clamp ring (6) and liner (1)

•

Oil consumption < 1 % of seal size is to be considered as normal.

Defects of piping or drain open.

•

Check piping and setting of valves.

•

Fill up forward seal tank with oil.

Heavy oil losses through the forward seal.

Sealing rings V1 and V2 are • damaged.

Fwd seal runs hot. Perbunan > 60°C Viton > 110°C

Tab. 16:

Realign clamp ring (6) and liner (1).

Adjust clamp ring (6) first and fasten with screws (17), then fasten liner (1) by screws (15).

Observe oil level in gravity tank and in forward seal tank, refill if necessary.

•

Replace sealing rings V1 and V2 with bonding device.

No oil in tank for forward seal.

•

Fill up forward seal tank with oil.

Load at sealing ring V1 too high.

•

Check sealing ring load, contact SKF Marine Service.

•

Lower gravity tank or raise tank of forward seal if necessary

Trouble shooting SIMPLEX

Forward seal type Z

SKF Marine GmbH Hermann-Blohm-Str. 5, 20457 Hamburg, GERMANY E_SC3 S + Z

Rev. 03.07.2017

188 / 189