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Manifold drain cocks |
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Jonny Quest 
Grand Poobah 
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2992 |
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 Topic: Manifold drain cocksPosted: October-08-2024 at 8:42pm |
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I like the drain petcocks for the engine block and raw water J-bend. I agree with many that have voice opinions here that a "plug" at the end of the exhaust manifold/riser is a good way to go so that one can really flush out the gunk that can collect there.
In the PCM / CC owners manual, it calls for flushing out of the exhaust manifold/riser with a garden hose on the front end and having the flush water exit the at the rear. JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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TRBenj
Grand Poobah
Joined: June-29-2005 Location: NWCT Status: Offline Points: 21189 |
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Posted: October-08-2024 at 4:58pm |
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I wouldn’t use those… can’t probe anything. Asking for problems.
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uncle-buck
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Joined: June-14-2004 Location: United States Status: Offline Points: 331 |
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Posted: October-08-2024 at 4:29pm |
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I purchased a set of drains from SkiDim several years ago. One for each exhaust manifold, one for each side of the engine block, and one for the U under the thermostat. They have worked well.
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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wayoutthere
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Joined: February-28-2020 Location: Florida Status: Offline Points: 489 |
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Posted: October-07-2024 at 9:35pm |
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Question about this, if your installing drains on the rear of the exhaust manifolds,
I noticed quite a large build up of silt on the 79 behind those 1/2 drive plugs, granted maybe from lack of service being an orlando boat. How about routing the cooling hoses to the rear of the manifolds ? My thought is it will always flush silt out and pop the hose off for winterization, like to know if thats an option good or bad. |
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KENO
Grand Poobah
Joined: June-06-2004 Location: United States Status: Offline Points: 11140 |
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Posted: October-07-2024 at 7:33pm |
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Jonny Quest
Grand Poobah
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2992 |
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Posted: October-07-2024 at 4:34pm |
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Mark:
On my 2 previouis boats with the 5.8 Small Block Ford, I used these:  I purchased them from McMaster-Carr: https://www.mcmaster.com/products/petcocks/drainage-valves-5/ I had one for each side of the block and one for the U-Bend (J-Bend) in the raw water system. I also replaced the cast iron plugs with brass plugs at the ends of the exhaust manifolds/risers. JQ |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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ultrarunner
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Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1854 |
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Posted: October-07-2024 at 12:30pm |
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For those that have done it, can I see a pic of your setup? Thanks, Mark
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