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Old 01-06-2020, 03:09 PM   #1
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Default Flushing

I have another question my boat is a 3000 scr with 4.3l and bravo ll i live in miami salt water and im planing to live the boat in the water at the marina any sugestion how can i flush the engine since the boat will stay at a slip
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Old 01-06-2020, 05:52 PM   #2
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Being a Bravo you can add a flush kit like the one Perko makes that installs on the raw water pump inlet hose and allows you to connect a garden hose to flush with fresh water.

https://www.amazon.com/Perko-0456DP7.../dp/B00144D86Y
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Old 01-06-2020, 09:30 PM   #3
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Great thanks
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Old 01-07-2020, 02:46 PM   #4
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Groco also makes a Flush Kit in a variety of sizes.

https://www.defender.com/product.jsp...947&id=2755962
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Old 01-07-2020, 04:18 PM   #5
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Thanks
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Old 01-07-2020, 05:25 PM   #6
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Wow, that looks fancy, but for $90? I made one out of brass fittings for maybe $25. Since then Iíve replaced both flush kits with the Mercruiser one. I also recently got the star brite salt off with the hose flush kit. Salt away offers a similar thing to neutralize and protect.
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Old 01-07-2020, 06:33 PM   #7
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Jjjj thats good ill try
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Old 01-08-2020, 12:17 AM   #8
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Quote:
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Groco also makes a Flush Kit in a variety of sizes.

https://www.defender.com/product.jsp...947&id=2755962
This is designed to attach to a seacock and not meant for installation into a transom feed water hose, I.e. factory I/O setup.

In order for the OP to use it he must install a thru hull seacock and strainer to supply raw water and then close off the transom assembly water line by removing the water line fitting and capping it off.
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Old 01-08-2020, 12:20 AM   #9
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jjjj thats good ill try
read post 8 first!
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Old 01-08-2020, 11:15 AM   #10
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Perfect thanks a lot
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Old 01-08-2020, 08:04 PM   #11
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This is what I made...
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Old 01-09-2020, 02:39 AM   #12
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This is what I made...
No valve to isolate the hose feed? Is the end of that hose capped off?
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Old 01-09-2020, 04:15 AM   #13
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No valve to isolate the hose feed? Is the end of that hose capped off?


I did not shut the raw water off. Just expect at idle that the hose is forcing at least as much water as the pump wants. Same concept as the kit that came with the Mercruiser installed heat exchangers Iíve gotten from horizon engines. And the small hose had a garden hose fitting and cap. I moved that to the newer one I got.
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Old 01-09-2020, 10:49 AM   #14
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Ok thats great
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Old 01-09-2020, 01:06 PM   #15
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I did not shut the raw water off. Just expect at idle that the hose is forcing at least as much water as the pump wants. Same concept as the kit that came with the Mercruiser installed heat exchangers I’ve gotten from horizon engines. And the small hose had a garden hose fitting and cap. I moved that to the newer one I got.
Thanks, I’ll have to research it when I have time.

Isn’t the horizon engine for inboard applications? If so I would think it’s pickup is through a seacock and wonder is Mercruiser’s instructions are to close that valve when flushing to maintain good water pressure/flow to the raw water pump.
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Old 01-09-2020, 02:01 PM   #16
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Thanks, Iíll have to research it when I have time.

Isnít the horizon engine for inboard applications? If so I would think itís pickup is through a seacock and wonder is Mercruiserís instructions are to close that valve when flushing to maintain good water pressure/flow to the raw water pump.


They were inboard engines. Never thought about that. But my thought is reduced salt is at least better than all salt.
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Old 01-09-2020, 02:06 PM   #17
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Quote:
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This is designed to attach to a seacock and not meant for installation into a transom feed water hose, I.e. factory I/O setup.

In order for the OP to use it he must install a thru hull seacock and strainer to supply raw water and then close off the transom assembly water line by removing the water line fitting and capping it off.
I agree, though I usually install them on the inlet to the sea strainer (same church different pew (other end of the same hose)). I had to read the reply a few times, then it occurred to me that I'm going on my 4th season with an Inboard.

You are correct, the Groco wouldn't work with an I/O, it would backflow through the outdrive.

They do work great for winterizing the raw water head intake and AC though
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Old 01-09-2020, 02:18 PM   #18
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I made one out of brass fittings for maybe $25.
Is it Brass or Bronze?? They look and act similar, however Brass has no place in a marine environment. It should be Bronze. This is a common problem with buying marine parts at box stores.
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Old 01-09-2020, 02:31 PM   #19
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Is it Brass or Bronze?? They look and act similar, however Brass has no place in a marine environment. It should be Bronze. This is a common problem with buying marine parts at box stores.

The nipples are all brass and I think the T is bronze. Three seasons in the salt water and it looked the same as when I put it in...
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Old 01-09-2020, 02:38 PM   #20
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That is what I thought as well.

Brass is an alloy of copper and zinc.

Bronze is a metal alloy consisting primarily of copper, usually with tin as the main additive, but sometimes with other elements such as phosphorus, manganese, aluminum, or silicon. ... Higher malleability than zinc or copper.

Zinc is noble. If salt water is running through there it will corrode on the exposed surface (Interior), and you will only notice it when it fails. Consider replacing the brass hose adapters with bronze.
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