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Wilhelm Hertzog 
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Joined: June-14-2014 Location: Cape Town Status: Offline Points: 349 |
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 Topic: Drain plugPosted: January-22-2024 at 6:46am |
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My boat currently has a non-standard drain plug fitted that I want to replace. I take it that this is the standard/OEM drain plug:
I'm also considering this lock nut style plug from Perko: Any pro's and con's to consider between the two different styles? Or is it purely down to personal preference? Thanks! Wilhelm |
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11155 |
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Posted: January-22-2024 at 1:08pm |
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Since you asked this question a couple of years ago, I guess your transom style drain installed with the flange on the inside hasn't fallen apart yet  Old thread in the link below If it's in there and sealed good and you're worried about your mounting screws pulling out of the fiberglass (I'm guessing they're wood type screws, screwed into the fiberglass and not a through bolted setup) why not just remove the screws, drill the holes all the way through and use something like Stainless Steel panhead, round head or button head type machine screws with washers and nylock nuts on the inside, all sealed with your favorite sealer. It won't fall out due to water pressure like you're worrying about in the previous thread or from screws pulling out. Otherwise I'd say it would be a personal preference type thing if you're replacing the whole thing |
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Wilhelm Hertzog
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Posted: January-22-2024 at 2:30pm |
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Thanks Ken. Your memory/ability to dig stuff up is astonishing.
Things have indeed held up without any problems in the two years since that last thread of mine. I do notice a bit of movement of the flange when at times I unscrew the drain plug after it's been screwed in very tightly. So I do want to re-bed/secure the fitting properly to put my mind at ease. Also, the current drain is 1/2" NPT, not the factory 3/4" NPT. I installed a drain hose for the oil sump some time ago. The smallest hose that would do the job does not fit through the 1/2" NPT hole, but should fit through the 3/4" NPT hole - which would make the job of changing oil somewhat easier. So I'll probably replace the current drain regardless of concerns about leaks etc.
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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KENO
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Posted: January-22-2024 at 4:59pm |
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I suppose that if you go with the original style, all the holes are already there, maybe the bolt holes are full of sealer etc that needs to be dug out, but you wouldn't be making any new holes..........and you could do the MrMcD cut like referenced in the thread from a couple of years ago, if you want to drain the maximum amount of water out.
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3764 |
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Posted: January-22-2024 at 9:17pm |
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The modified drain plug in my 95 Ski Nautique is still working and does not leak at all. I think this was from 2015 or 2016? I bet if the screws and flange were bedded with 5200 the drain would be firm till the boat falls apart around it. That stuff is pretty tough and easy to use on install.
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Wilhelm Hertzog
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Posted: August-25-2024 at 4:28pm |
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So I've finally gotten round to buying this Perko drain plug. There is a little ridge running down the side of the outside of the female threads of the drain - circled in red in the picture below. I assume this helps to prevent the drain from being dislodged if the male plug is twisted with force.
Question: how should this ridge be accomodated in the installation of the drain? Do I drill the hole only large enough to fit the outside of the female threads of the drain, and then cut a little channel in the fiberglass to accomodate the ridge? Or do I drill the hole so that it is large enough to fit the entire drain, and just fill the space around the outside of the female threads with sealant?  |
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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KENO
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Posted: August-26-2024 at 8:42am |
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If you scroll down in the link below, to where they give a handful of dimensions, it says the cutout diameter should be 1 3/8 inches. I'd find a scrap piece of wood, drill a 1 3/8 hole and see how things fit The 4 thru hull mounting screws should withstand any twisting you could give
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Wilhelm Hertzog
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Posted: August-26-2024 at 9:59am |
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Thanks Ken. I was looking for installation instructions in the package and on the Perko website, but no luck. Never came across the instructions on the Defender site - much appreciated.
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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Wilhelm Hertzog
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Posted: August-26-2024 at 4:41pm |
Not very tight, is my conclusion. But my one size smaller hole saw is definitely too small. So plan is to go with the 1 3/8 hole and just screw and seal it down properly. |
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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gun-driver
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Posted: August-27-2024 at 9:21pm |
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The drain plug on my two boats are through bolted with taper head machine screws and small washers under the nylon lock nuts.
Guessing # 10 stainless
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Wilhelm Hertzog
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Posted: August-28-2024 at 2:42am |
Thanks. I do like the added peace of mind of through bolting. I may well go that route rather than just the #8 screws that the Perko information leaflet in the drain plug package suggests.
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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MrMcD
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Posted: August-28-2024 at 3:09am |
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I would bed it with the 5200 regardless of what bolts/screws you choose to use. That stuff will keep it dry and tight forever.
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KENO
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Posted: August-28-2024 at 6:38am |
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Since they say to use #8 screws, that probably means that the holes and the countersinks for the screw heads are drilled for a #8 flathead machine screw to fit just right
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KENO wrote: