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 Catalina 25 Specific Forum
 Mast plate installation		  New Topic  Topic Locked
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pfduffy
Captain

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USA
317 Posts
Initially Posted - 03/05/2011 :  12:13:10  Show Profile
I removed the tabernacle in preparation for installing a mast plate today. Of the 4 fasteners holding it, none were the same. One was through bolted into the head area.

My thought is to overdrill the existing holes and fill with epoxy then re-drill. The question is, what is the correct type of fastener? Also, none of these should be through bolted, correct?? Finally, if the mast plate and tabernacle is not installed EXACTLY in the same location, what are the ramifications? I expect that it will be very close, but not exact.
Pat Duffy
1984 SK/SR #4113
Slàinte
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 03/05/2011 :  14:17:53  Show Profile
Pat, this is what you are installing?

http://www.catalinadirect.com/index.cfm?fuseaction=product.display&product_ID=1406

If so, I'm pretty sure this is discussing the same part:

http://www.catalina-capri-25s.org/forum/topic.asp?TOPIC_ID=22573
Edited by - OJ on 03/05/2011 14:34:58
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Stinkpotter
Master Marine Consultant

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Djibouti
9080 Posts
Response Posted - 03/05/2011 :  14:30:05  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by pfduffy</i>
<br />...Finally, if the mast plate and tabernacle is not installed EXACTLY in the same location, what are the ramifications? I expect that it will be very close, but not exact.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">You'll be a knot faster on one tack than on the other.

Mine was thru-bolted, except maybe for one lag screw into the compression post--it was about 10 years ago that I installed the plate. One or two bolts were extremely close to the bulkhead, inside the head area, so even small washers were difficult to install. I would thru-bolt wherever possible--you have mostly a compression force, but that could change dramatically when lowering or raising the mast, depending on how it's supported. And some years down the road, you have a better chance of detecting seepage with thru-bolts than with screws into the core.
Edited by - Stinkpotter on 03/05/2011 14:30:56
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skybird
Navigator

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USA
135 Posts
Response Posted - 03/05/2011 :  22:43:13  Show Profile  Visit skybird's Homepage
The link posted above describes my mast plate install. All 4 holes were through-bolted--the forward ones almost in the piping of the bulkhead and the aft ones just aft of the compression post. All that was required (other than adjusting the holes in the plate) was to run a bit through to clean the holes up and purchase of 4 stainless bolts about 1/2 inch longer than the originals. I bedded it all with more 4200 than necessary and trimmed the excess after it dried. Got a good seal in the holes and all the way around the step.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 03/06/2011 :  22:04:19  Show Profile
My replacement tabernacle (don't ask) is now through bolted, but only one pair of holes on the replacement from CD matched so I filled and drilled. It's an old song, but <u>bed with polysufide</u>, not polyurethane. Polysulfide is a bedding compound, <u>no</u> polyurethane is. No 4200, no 5200, no silicone. Use the best product for bedding and you will have a permanently watertight fitting that can be easily disassembled should the need ever arise.
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 05/21/2011 :  16:53:47  Show Profile
Pulled the tabernacle in preparation to install the mast plate. Two of the six holes were off enough that they will need to be elongated.

The holes are off so slightly it is difficult to tell which piece was drilled incorrectly - the tabernacle or the mast plate.

Thankfully someone at the marina owns a machine shop with an end mill.
Edited by - OJ on 05/21/2011 16:54:43
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.