Maintenance and Repairs

Metal Stitching a Cracked Stuffing Box Housing

 
 

 

This describes a repair made to an RT-Flex engine, after two piston rod palm nuts came loose and worked their way up the threads, until they started to impact on the underside of the stuffing box. The stuffing box was broken and replaced, but the diaphragm plate was cracked at the bolt holes where the stuffing box is secured into the diaphragm plate.

 

This photo shows the crack on the  pump side of the engine: the crack is 280mm long.

This photo shows the crack on the exhaust side of the engine: the crack is 70mm long.

 

The cracks were repaired as follows:

 

1.

A stop hole was drilled at the end of the horizontal crack on the pump side

2.

The diaphragm plate was drilled across the crack and a locking key fitted

3.

The damaged bolt hole was drilled out and a plug inserted.

 

4

The horizontal crack was chain drilled and tapped.

5

And stitching pins screwed in.

6

The vertical crack was chain drilled.

 

7

The drilled holes in the vertical crack were then tapped

8

Stitching pins screwed in

9

Stitching pins cut off close to surface

 

10

Overlapping stitching pins

11

Grinding the stitching pins flush with surface

12

The crack on the exhaust side was repaired in a similar manner

 

13

The Bolt hole was drilled

 

14

And tapped

15

The completed repair

 

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