Sunday, January the 7th 2018

More repairs – part 1

As it seems, I had not enough by just repairing the rudder this winter and so I opened up a few more jobs. There is the cutlass bearing that I will replace and also the Volvo shaft seal but some other problems showed up too.

The HR 352 has a very classical type of cutlass bearing housing. It can be unscrewed with the help of a large pipe wrench and some effort after removing the two locking screws.

A polyurethane sealant (Sikaflex 291i?) was used most likely for sealing the bearing housing against the hull but it was also applied on the thread.

The Centa-coupling needs to be disassembled if the Volvo shaft seal is to be replaced. When I started I realized that the water that had entered the boat in Gibraltar in 2015 had led to some corrosion at these parts although I had washed everything with fresh water as soon as I could. It took me about 4 hours to remove the 6 screws fixing the rubber parts to the flanges. One of the 6 screws that hold the rubber parts on the connecting tube wouldn’t let go from the rubber element and so I had to destroy it. That is another EUR 120 for a new rubber element on this season’s list :-)

These screws gave me a hard time…

The coupling is out…

…and so is the propeller shaft from the coupling flange as well as the Volvo shaft seal.

When I detached the bearing of the Centa-Coupling from the bulkhead, I found another problem.

In the mounting instruction, the bulkhead A is supposed to be a solid part, either metal or solid GRP but not plywood. When the bearing was installed on Matilda’s plywood bulkhead which was added when the engine was replaced, the installer should have used big washers on both sides of the bulkhead. Since that wasn’t done, the bushes 1.17 were pressed into the plywood resulting in a loose connection (Centa is specifying a tightening torque of 79 Nm for these screws).

The Centa coupling was taken apart and cleaned piece by piece and is now ready for reassembly.

There has been a small leakage at the ruder shaft tube (between the tube and the GRP) from the time I bought the boat back in 2014. Nothing serious, but since the rudder is off now, I will address this too.

This is how the area looks around the rudder shaft tube after removing some putty.

The picture shows the rudder shaft tube with the stuffing box housing inside the boat. Hallberg Rassy had used silicone for sealing this end. I had poured a few liters of fresh water around the stuffing box and let them leak through to the outside in order to wash out the salt that may have accumulated along the leakage path.

…to be continued in part 2

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