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What is mast base plate bolted to?

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djn
Master Marine Consultant

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USA
1561 Posts

Initially Posted - 02/07/2006 : 10:02:11

Hi All, I am getting ready to drop my mast and do a number of mods and maintainance items. One of the mods will be to add a plate under the base plate that has port and starboard flanges with holes for blocks to lead my line aft. I looked inside the boat, under the mast and can not see what the mast base plate is bolted to. I don't want to ripping things apart without knowing what is there first. Thanks for your help. Cheers.

Dennis
No Boat
S.E. Michigan

Edited by - on

dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 02/07/2006 : 10:21:56

Dennis,

The original mast plate is held in place by lag screws. If you are replacing the mast plate, you might want to change it over to thru-bolts.

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djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 02/07/2006 : 10:51:59

Hi Don, That is what I thought might be the case. However, when I go below, I can not see where the bolts would come through. Do I have to take apart the bulkhead to get to that area or will the new holes come through in the open? Cheers.

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Bill Holcomb
Admiral

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USA
769 Posts

Response Posted - 02/07/2006 : 11:00:34

Hi Dennis,

As Don said, your earlier model indicates that you've probably got lag bolts. On later models, the factory changed over to thru-bolts.

To see if you're going to run into problems with the bulkhead or compression post, drill a pilot hole with a 1/8" bit first. You might have to do some wood removal with a chisel.

While you're adding the mast base plate, you might consider changing your mast tabernacle too if it's the original aluminum one. The change is to a much stronger stainless steel version. And, with the mast down, check to insure that a PO upgraded the spreader bases to stainless steel. Both the tabernacle and the spreader base upgrades were factory recommendations.

Bill Holcomb - C25 Snickerdoodle #4839

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djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 02/07/2006 : 12:01:04

Hi Bill, I am not sure what the Turnbuckle is. While I have the mast down, I am going to internal rope haylards and new shives, LED lights, new windex, new antenna, SS spreader sockets, and of course new base and plate.

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 02/07/2006 : 12:32:26

Dennis,...A tabernacle is a device that receives and secures a deck stepped mast.

Edited by - dlucier on 02/07/2006 12:36:37

Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 02/07/2006 : 13:30:54

Hi Dennis... The tabernacle on my '85 is extended slightly with a welded plate that allows the bolts to go through just forward and aft of the compression post. (I presume it's original equipment.) If your tabernacle is lag-screwed into the post, you might want to ask Catalina Direct or Catalina Yachts about a new tabernacle. The holes on mine didn't match up to the holes in Catalina Direct's base plate--I got a machine shop to re-drill the plate. If CD has both, they presumably match up and allow thru-bolting. You might want to fill the old holes with epoxy (slow-cure so as not to generate too much heat in the post) before you cover them up.

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djn
Master Marine Consultant

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USA
1561 Posts

Response Posted - 02/07/2006 : 14:34:56

Thanks Don and Dave. Yep, I am replacing that too as mine has a crack in it....I just didn't know what it is called. I am a bit suprised that is does not fully attach to the support below. Cheers.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 02/07/2006 : 16:44:03

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by djn
 ...I am a bit suprised that is does not fully attach to the support below.
<hr height="1" noshade id="quote"></blockquote id="quote">
It's better to bolt it through the cabintop. If it's just screwed into the compression post (the support), it could conceivably pull out as you are lowering the mast if you create some upward leverage by supporting the mast too close to the tabernacle. That would be especially possible if some rot developed around the screws. Also, anything that helps to prevent moisture from reaching the compression post is a good idea--it's obviously pretty important to the intergrity of the rig.

BTW, there have been numerous discussions here about thru-bolting hardware in ways that prevent moisture from getting into the plywood core in the cabintop and decks... Leon's method is best--drill an oversized hole, mask it below and fill with epoxy, and then redrill the correct size hole through the epoxy plug. My method is lazier--countersink the hole slightly to allow a better "gasket" from the caulk around the bolt, etc... If this is your first thru-bolting exercise, I recommend you search for and read some of those discussions. Water is tenacious--you just don't want it finding its way into the core.

You'll love those lines led aft!

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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.