270 Sundeck water port question

S

Steve Walker

New Member
Jul 3, 2020
27
Boat Info
2007 sundeck 270
Engines
6.2L bravoIII
Hello all, I just bought a 2007 sundeck 270 and there is a port near the back seat that looks like a way to flush the engine. This boat primarily sees salt water and guessing it is an add-on. Anyone seen this and know what it is? How to use it? If I use it should I run the motor? The guy I bought the boat from wasn't the smartest. When I flush the motor using the earmuffs on the lower unit, it seems to take a long time for water to get through the engine and out the port. Approximately 15 seconds. Is that normal? My last boat seemed to be 2-3 seconds.

Sorry for the long multiple questions in one post, I would really appreciate some help in these areas that I am new too. Thank you all very much!
 

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That could be for flushing the motor.

Follow the hose in the bilge and see where it goes. That’ll give you a better idea of what it’s for.
 
It’s a flush port, they are normally connected to a perko flushpro so you can flush the engine in salt water.

You need to make sure that it is closed tight with a bravo 3 because it can let in air and mess up the water intake. Kind of like having a hole in your straw.

mine is disconnected, gave me nothing but headaches.
 
you are supposed to run the motor when flushing. Mine takes a while on the muffs as well, I try not to run on muffs too often.
 
The hose definitely connects to the engine. Does anyone know what it's called or have some documentation I could review on it. I can't seem to find anything online about it. Thanks again.
 
It literally looks like a T connected to the engines cooling system. Probably a check valve in there somewhere. My thought on this and question for the round table, if you are bypassing your water pump in the lower unit, and running the engine, wouldn't that burn up the water pump down there?
 
A couple things... First, it may or may not be an actual "kit". It could just be something that someone scavenged together (which is fine, as long as it was done properly). Next, it's very normal for it to take 15 or 30 seconds for the water to start being expelled when running on muffs - as long as the water is being sucked in (evidenced by the lack of spray escaping the muffs), everything is fine. Third, when on land, use the muffs - depending on where/how the "kit" is t'd in, anyways. Fourth, your impeller is not in the drive - it's on the engine, bottom stbd side - look closer at things - follow the water intake hose coming from the transom.
 
Most of the kits tee into the raw water pump inlet, you have to run the engine with those. Mercury says don’t run their kit for longer than 15 seconds if the engine isn’t running.

You are not supposed to run the engine on the SuperFlush one that taps into the drain points downstream of the raw water pump.

I can’t reconcile why mercury says max 15 seconds without engine running while others say to flush without running.

https://www.mercruiserparts.com/Attachment/DownloadFile?downloadId=15
 
Thank you all for your answers. I just got the boat and was always kept above water, I have to trailer it home and it's always in salt water. I think the safest option will be to just muff it.
 
a 2011 185 sport here. When I connect to the flush port on the stern above the swim platform am I supposed to run the engine? Wouldn't it still suck water through the lower unit if the engine is running?
 
ColoSR said:
It’s a flush port, they are normally connected to a perko flushpro so you can flush the engine in salt water.

You need to make sure that it is closed tight with a bravo 3 because it can let in air and mess up the water intake. Kind of like having a hole in your straw.

mine is disconnected, gave me nothing but headaches.
Click to expand...
Do you run the engine while using this port? Won't it still suck water through the lower unit if the engine is running?
 
I just don't use it. I have to get the boat out of the water Everytime I use it. So I flush it using muffs
 
I am an a slip this year so I need to use it. Next year I will be on a trailer and I can use muffs. I want to flush after every use. I don't want to wait until October.
 
Do you have an Alpha drive or Bravo drive? The alpha raw water pump is in the leg, while the Bravo is inside the boat on the engine.

If you have a Bravo and your flush kit is tee'd into the raw water line upstream of the raw water pump you need to run the engine. Don't run it above idle because the engine can suck more water than the hose can deliver. You will probably pull in some seawater, but it would be diluted by the hose. The only way to eliminate it pulling in any saltwater without adding valves is to trim it up and use the muffs in the water. Also, be careful that the flush connection is closed tight after use. If it is leaking air you can break the suction on the pump and overheat.

Disregard all this if you have an Alpha drive. You are probably stuck with muffs to flush those.
 
I don't know which drive it is. The port is a stock part. It came from the factory with it. Is there an easy to tell which drive it is?
 
Scott1523 said:
I don't know which drive it is. The port is a stock part. It came from the factory with it. Is there an easy to tell which drive it is?
Click to expand...
I don't recall that being an option on that model from Sea Ray. You'll need to follow the hose, on the inside, and trace the plumbing to see what type of flush setup you have before determining if you should/can run the engine.
 
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