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Author Topic:   Steel "Clam Shells"
H Rapido posted 05-14-2002 04:31 PM ET (US)   Profile for H Rapido   Send Email to H Rapido  
I've got an 18' Outrage that is in the restoration process. I've noticed that at one time there were "Clam Shell" type fittings in front of the bow and stern drain holes. They have since dissapeared. Is it necessary to repalce them?
padrefigure posted 05-14-2002 07:00 PM ET (US)     Profile for padrefigure  Send Email to padrefigure     
If you do not replace the clam shells, you will get a venturi jet of water into the anchor locker (bow) or inner hull/tank area (stern.) You could stop this with a plug (I guess), but it is nice to be able to leave these open to keep water from building up in these compartments. I would replace the clam shells.
H Rapido posted 05-15-2002 01:33 PM ET (US)     Profile for H Rapido  Send Email to H Rapido     
Thanks for the input. It sounds like the boat should be operated with these drains un-plugged? Won't the stern area fill with water when someone is on the starboard side stern?
Tom W Clark posted 05-15-2002 01:55 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
H Rapido,

You want to replace the clam shells whether or not you use the plugs.

You can use the plugs or not as you see fit. Some do, some don't. The most common arrangement is to plug the the main drain hole in the back and leave the bow locker plug out.

Yes, water will enter the boat if the main drain plug is out. The amount of people and gear as well as the weight of the motor will dictate whether or not any water will appear above the level of the deck but chances are it will. Even if it doesn't, there will be a large amount of water sloshing around the bilge and the around the fuel tank if you leave the plug out.

This extra water will take a while to drain every time the boat gets up on plane. It will also take more power and time to plane because of the extra weight.

The clam shell ventilators used on the Whalers in the 1980 were not the Perko clam shells which had three screw holes but rather a stainless steel variety that mounted with five screws. I'm not sure who the manufacturer of these is or was.

Leener posted 05-16-2002 08:43 AM ET (US)     Profile for Leener  Send Email to Leener     
Iam also looking for the clam shells for an 89 18' Outrage. I know the originals are not Perko as mine are on the boat. They have 5 screw holes and are slightly elongated compared to the Perko. If I find them I will post again. Please do the same...
Leener
SeaHag posted 05-16-2002 09:59 AM ET (US)     Profile for SeaHag  Send Email to SeaHag     
Yet again this forum proves its value. I am faced with this same situation.
I own a 1980 20' outrage. It does have the clamshell missing. It seems the previous owner may have 'knocked' it off when 'driving on the trailer' (my guess).

1) Anyway, can someone let me know where to find the clamshells? (it reads that I may be looking for a '5 hole' versus the '3 hole'?)

2) What about the joint between this soon to be installed clamshell and the exististing 'thru hull tube'? Should this be a one piece unit (i.e. assemble before installation?) or can I just install the clamshell with caulk ( 3m 5200) and be done with it.

Thanks for your help!

SeaHag posted 05-16-2002 10:03 AM ET (US)     Profile for SeaHag  Send Email to SeaHag     
Clarification to my #2. What I mean is do I need to apply caulk to the end of the existing drain tube, the install the clamshell? I am assuming the clamshell is attached by SS screws fastened into the hull (below the water line?@???)

Thanks again.

Tom W Clark posted 05-16-2002 10:41 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
SeaHag,

I don't think anyone has found the OEM clam shells for the Outrages. Many threads have discussed this but no correct answers have been presented.

As far as installation, yes you want to bed the clam shell itself in a polyurethane caulk.

This may be a good time to replace your drain tube if it is original as the clam shell has to be removed to do this operation anyway.

If your original clam shell was broken off then you may have the broken shanks of the screws in the skin of the hull. If not, the holes may have been torn and enlarged. Either way, you may want to get a different clam shell with a different screw hole lay out.

For what it's worth, I looked at a 25 1989 model Whaler a few months ago that had fiberglass clam shells on the bottom of the hull. This boat had had all the drain tubes replaced with plastic and I think the original clamshells may have been too small to cover. It appeared that the fiberglass clam shells were fabricated by whoever did the drain tube work. It could have been factory but I don't think so. Anyway, it would be fairly simple to do this yourself if need be.

lhg posted 05-16-2002 04:01 PM ET (US)     Profile for lhg    
Hold it guys. The Clam shell ventilators DO exist, and they should be installed. I just replaced the factory installed ones on both of my Outrages, with a perfect match. See the OEM section.

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