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Old 04-21-2015, 04:52 PM
pgaines1 pgaines1 is offline
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New to boating, bought a tristar. What is this??

I bought a 1991 tristar sport, i was searching for the drain plugs to make sure they are all in before i put her out on the water and i came across this. any ideas? It is a half dollar sized hole right behind the starter on the drivers side engine block.
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Old 04-21-2015, 04:59 PM
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Leaky freeze plug??
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Old 04-21-2015, 05:02 PM
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Leaky freeze plug??
Yep............
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Old 04-21-2015, 05:23 PM
pgaines1 pgaines1 is offline
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thanks guys. I'll pick one up from the shop tomorrow and get it on the water.
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Old 04-21-2015, 05:54 PM
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I don't think I would do anything with it, take the boat out and see if it still leaks. If it doesn't, don't touch it.
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Old 04-21-2015, 06:06 PM
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Also should be brass if you change them. Local auto parts store ordered them for me when I changed all of mine.
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Old 04-21-2015, 08:10 PM
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Like everyone said before leaky freeze plug but IMO needs to be addressed and fixed because to winterized you will eventually have to remove it. The threads in block are corroded and if you are comfortable getting a new brass NPT plug, I believe it is a 3/8" you can chase threads in block with a NPT tap 9/16, not exactly sure of these sizes But am sure someone will chime in to correct me. If you arent comfortable doing this have your local reputable marina do it for you. It is easy job and it worked for me.
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Old 04-21-2015, 11:18 PM
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Originally Posted by Slinkyredfoot View Post
Like everyone said before leaky freeze plug but IMO needs to be addressed and fixed because to winterized you will eventually have to remove it. The threads in block are corroded and if you are comfortable getting a new brass NPT plug, I believe it is a 3/8" you can chase threads in block with a NPT tap 9/16, not exactly sure of these sizes But am sure someone will chime in to correct me. If you arent comfortable doing this have your local reputable marina do it for you. It is easy job and it worked for me.
I am pretty sure that's not the screw in plug but the brass pressing frost plug. Just use a punch to press it in just a bit. Once you get it partially removed use a players to pull it out. Use sandpaper to clean the hole. Apply a little silicone or anaerobic sealer and gently press it in with a large socket similar in size to the new plug.
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Old 04-21-2015, 11:37 PM
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It looks to me like there is no freeze plug in there at all. You need to install one before going to the lake or you will be swimming home. There are freeze plugs on both sides of the block. Make sure you put some in before attempting a launch. I would run in driveway with a "fake a lake" attached to a garden hose first.


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Old 04-22-2015, 05:49 AM
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Originally Posted by 06MCX15 View Post
It looks to me like there is no freeze plug in there at all. You need to install one before going to the lake or you will be swimming home. There are freeze plugs on both sides of the block. Make sure you put some in before attempting a launch. I would run in driveway with a "fake a lake" attached to a garden hose first.


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It looks like it's there just rusted, that tells me they used the wrong freeze plugs or the engine has been changed and not marinized. If that's a word.
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