axial detuner maintenance

8/3/2019 Axial Detuner Maintenance

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RTA58T-BMaintenance 3146–1/A1

1Wärtsilä NSD Switzerland Ltd

Key to Illustrations:

1 Upper part of cylinder2 Lower part of cylinder

3 Screw4 Screw5 Screw6 Large seal ring7 Small seal ring8 Self-locking nut9 Allen screw

10 Throttling valve11 Spindle12 Locking screw13 Diaphragms

14 Oil inlet pipe15 Main bearing cover

16 Crankshaft17 Main bearing shell18 Oil drain pipe19 Upper casing20 ELBA (El. balancer)21 Screw22 Piping for detuner

monitoring

H Lifting tackleR Eye bolt

ools:

1 Steel rope with two shackles 943091 Roller support 94310

2 Eye bolts M16

When the seal ring 6 or 7 has to be removed from an axial detuner, proceed as follows:

– Switch off the bearing oil pump.

– Remove the oil drain pipe 18.

– Unscrew and remove the oil inlet pipes 14 and the piping for detuner monitoring internal and external from theupper casing 19.

– Remove the upper casing 19.

20A

18

19

99.7159

1422

Axial Detuner

Dismantling and Assembling

1999

http://sin00249.pdf/






Maintenance3146–1/A1RTA58T-B

2 Wärtsilä NSD Switzerland Ltd

Dismantling

– Remove the oil inlet pipe 14.

– Loosen screws 21 and remove the throttling valve 10.

– Pull both taper pins locating the upper and lower part of cylinder 1 and 2 by means of the withdrawing devicewhich is part of the standard tools. For this purpose the taper pins have been provided with a thread of M10.

– Loosen and remove all the screws 5 and 3 (Fig. ’B’).

– Loosen all screws 4 to the upper part of cylinder 1 and pull them out as far as possible.

99.7063

13

7

12

5

14

1

4

3

16

2

17

76

10

11

B21

15

Axial Detuner: Dismantling and Assembling

1999





Removal of the upper part of cylinder

– Fasten roller support 94310 to the face of thefree end of the engine as shown in Fig. ’C’.

– Screw the two eye bolts ’R’ into the upper partof cylinder 1, then join these by means ofshackles and steel rope 94309 to a lifting

tackle.

– Using lifting tackle carefully raise upper partof cylinder . Make absolutely sure that the up-

per part of cylinder slides out of the sealrings 6 and 7 without jamming, as other-wise the seal rings risk being damaged.

C

99.7064

I

1

94309

R

94310

94310

I

94309

R

1615

6

7

H


1999



Maintenance3146–1/A1RTA58T-B

4 Wärtsilä NSD Switzerland Ltd

6 (7)

9

8

Removal of the seal rings

Should the two-part seal rings 6 and 7 have to bereplaced, loosen first self-locking nut 8 and removeallen screw 9. The sealing rings can then be turnedout of their grooves in the lower part of cylinder 2without any problems.

Checking the throttling valve

When overhauling the axial detuner check also thecondition of throttling valve 10. The spindle positionhas been locked by locking screw 12 and a lockingplate. Changing the position of the throttlingvalve is forbidden.For pre-setting the spindle 11 has to be turned backby about four turns starting from the closed position.

This adjustment must be verified on the basis ofvibration measurements during sea trial; otherwisethe spindle must be readjusted. The final adjustmenthas to be engraved on the name plate fitted to theupper part of the cylinder 1.

99.7050

D

E11

13

12

11

X

Should it become necessary to unscrew or replace a spindle for any reason, then the distance ’x’ must be measuredfirst (Fig. E’). The spindle has to be adjusted to the same distance on reassembling.

The spindle must not be turned back by more than 17½ turns , that corresponds to a stroke ofx= 35 mm.

When the above check brings to light any defect of throttling valve 10 then diaphragms 13 screwed into the throttlingvalve must also be checked for possible damage and replaced if necessary.

The engine must not be operated with the spindle removed!


1999

Remark

Attention





Assembling

Badly worn or damaged seal rings 6 and 7 must be replaced. The seal rings are fastened by two allen screws 9 and

self-locking nuts 8. Immediately before fitting them smear the seal rings with clean engine oil.

Newly fitted seal rings must allow radial movement when fitted

The assembling of the axial detuner is done analogously to dismantling but in reverse sequence. Pay the utmostattention when lowering upper part of cylinder 1 into place, to prevent seal rings 6 and 7 from being damaged.

Before tightening screws 3 as well as 4 and 5 fit the taper pins for the upper part and lower part of the cylinder.

Apply MOLYKOTE and tighten screw 4 between axial detuner and bedplate with a tightening angle of 45_ (see alsogroup 0352–1).

New packings must be used for the assembly of the throttling valve 10 and the oil inlet pipe 14.


1999u



axial detuner maintenance

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