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Question: Mast Base Blocks

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D0bbies View Drop Down
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    Posted: 07 January 2019 at 20:13
I was doing some maintenance today and found that the block spigots that fit into the collar surrounding the mast (Bottom Arrow) are either very loose in there socket, some are quite stiff and some would not move/rotate at all. I guess these should be all the same so I've WD40'd them to see what happens. (Not sure sure if there is technical name for this arrangement?)

I also noticed that where each spigot is located in the collar there is a cut out on the outside of the collar at the base (Top Arrow) which appeared to be filled with salt. But on closer look I found it to be some sort of white rubber. The collar seems to be fixed with a series of cross head screws but I'm not sure if whether this is worth removing or left alone?

Any comments would be appreciated.


2005 312, Tiller, Engine 2GM20, SD20 Saildrive. Facnor SD 130 Furler.
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AndyS View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndyS Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2019 at 22:04
Not sure what the white compound is, but under there somewhere should be the nut that holds the mast base blocks in place. Check out this post (http://www.myhanse.com/lewmar-blocks_topic10074_post88629.html?KW=mast+base#88629) I replaced just about everything (as you can read in the above link) and have been very happy. The original equipment I believe is not quite heavy duty enough, but that is just my opinion. 
Andy
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2019 at 08:00
On my boat the "cuts" that you refer to were actually splits in the aluminium. These occurred in the first year of use & the dealer supplied  new mast base. However, I had to remove the mast at the end of the season to fit it. the second one split as well.
I could see that it was due to the pins being loose in the holes were tilting & applying pressure on the upper sides of the holes. this was splitting the top part of the collars but no further down. I decided to leave it for a while.
In later years I made a new mast base which sits under the aluminium one in "reserve" so I can get extra blocks on (spinnaker gear cunningham etc) & have a spare if a pin pulled through.
So i suggest that you re appraise the "compound" as it may have been applied to reduce tipping or it may be corrosion between stainless steel & the aluminium. If it was applied to reduce tipping then that would explain the non rotation. That would not be an issue so long as the block is aligned with the deck organiser as it would not need to rotate any more.
My pins did not have nuts on the bottom, they had wider flat sections machined on them to prevent them pulling through. From the picture I would suspect that yours is the same, not the nut version.
If you do not have the nut version now, then you will not be able to have them without first removing the mast & the base first to remove the old pins. Even then I doubt that it would work.
The base is held in place with machine screws into an aluminium plate set into the GRP. Mine came out fairly easily because the boat was new & when i first put them back i greased them.
No idea about the philips screws, !!!

This is a picture of what happened when the splits came so large that the aluminium sheared away

For the record this is what it looks like on the underside

Not a lot of room for nuts & 2 grooves are quite long


Edited by samuel - 08 January 2019 at 08:43
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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D0bbies View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote D0bbies Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2019 at 08:36
Many thanks to you guys, both very helpful replies.

I'm not so keen on having the mast removed but I'll take a closer look in the coming days and post back on my findings.

Samuel: Thankfully my collar is still 100% in tact with nothing broken, but they appear to be "cast aluminium" so yours must have been a bad one! Did you receive any compensation from Hanse or did they offer an explanation?

AndyS: Nuts or flanges on the bottom of the block posts I don't yet know. Should they be nuts and one can supposedly replace these by exit and entry via the slots in the base, how does one stop the nut from turning to unscrew them if the posts are supposed to rotate anyway? (Hope I explained that OK?)

Cheers
Bob


Edited by D0bbies - 09 January 2019 at 08:49
2005 312, Tiller, Engine 2GM20, SD20 Saildrive. Facnor SD 130 Furler.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2019 at 09:30
Originally posted by D0bbies D0bbies wrote:

Samuel: Thankfully my collar is still 100% in tact with nothing broken, but they appear to be "cast aluminium" so yours must have been a bad one! Did you receive any compensation from Hanse or did they offer an explanation?
Bob

I did not pursue compensation. I took the mast down to alter the fore stay length anyway.
the second mast base has started to do the same but less so
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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D0bbies View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote D0bbies Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2019 at 19:59
Originally posted by samuel samuel wrote:

No idea about the philips screws, !!!


Samuel: FYI only

Mistakenly I said the screws were cross head but they're actually countersunk flat blade screws. Probably a little more difficult to remove if I have to.



Cheers
Bob




Edited by D0bbies - 09 January 2019 at 20:00
2005 312, Tiller, Engine 2GM20, SD20 Saildrive. Facnor SD 130 Furler.
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2019 at 20:34
They hold the mast base to the deck & are fitted into a plate in the GRP. You can see the 4 holes in my first picture. They are the ones that I refitted with grease when I fitted the new base.
Looking at the picture you can see that the left hand block  where the pin goes through has started to crack. You can see the 2 splits in the photo
One crack can be seen in between the 2 legs of the block & the other can be seen just between the split ring & the block leg.
If you look at the right hand block it may be a mark on the aluminium but you may have a crack starting on that one as well-, just below the split ring
I would not be surprised if the second from left block has started to split
Take the blocks off so that you can see better
On my boat the 2 that take the greatest load are jib & main halyard & are to starboard of the mast. i suggest that these are the ones most likely to crack
However, I cannot really tell from the photo if they have cracked for sure and it may just be marks. I suggest that you examine with the sharp point of a knife.



Edited by samuel - 09 January 2019 at 20:57
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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