High pressure flushing

[Jacktrop99]

Strange question but does flushing your outboard with to high of pressure cause any harm? 3 times I’ve ran the hose fully open on the flush port “02 ox66 250” and have been wondering why the pee stream is so strong with some water coming back out the connector, Seems like my Marina re did the dock hoses, Just realized this but motor runs good with new impeller

 

[DennisG01]

Maybe your hose connection has a leak/isn't tight... does it have the washer in there? There shouldn't be any leaking - but as to your question, no, there's no problem as to what you asked about.

 

[seasick]

I assume you are flushing using the flush hose port and that the motor is not running.
If so, I don't see any problem. The question has more to do with the volume of water and not the pressure. The volume depends on the source volume flow, size of hose yo use and the length of the hose.

As mentioned, you shouldn't see water coming out of the flush port connection. Check the washers and fitings.

 

[Jacktrop99]

Reply

I assume you are flushing using the flush hose port and that the motor is not running.
If so, I don't see any problem. The question has more to do with the volume of water and not the pressure. The volume depends on the source volume flow, size of hose yo use and the length of the hose.

As mentioned, you shouldn't see water coming out of the flush port connection. Check the washers and fitings

Thanks, I keep the motor off and I do need to check the fitting but seals good under normal motor operation

 

[Jacktrop99]

Maybe your hose connection has a leak/isn't tight... does it have the washer in there? There shouldn't be any leaking - but as to your question, no, there's no problem as to what you asked about.

Have the yellow rubber piece in there, seals good under normal motor operation but I should check

 

[DennisG01]

I believe that under normal motor operation, there isn't any pressure at that fitting

 

[Jacktrop99]

I believe that under normal motor operation, there isn't any pressure at that fitting

when I take my flush port off the motor *looking at back of motor* I have to screw it to the right almost like a reverse thread, I tilt the flush port up mimicking the motor connection and tighten the screw on to the hose turning left, is this correct?

 

[luckydude]

I have a more modern engine, 2020 4 stroke 250. My water is pressurized to 50-60 PSI (pressure bladder) and I run it full blast into the engine and it seems fine. Pee stream is pretty normal (weaker than my Suzuki kicker, that guy pees!) and I get water out of the prop and another place on the lower unit.

 

[DennisG01]

when I take my flush port off the motor *looking at back of motor* I have to screw it to the right almost like a reverse thread, I tilt the flush port up mimicking the motor connection and tighten the screw on to the hose turning left, is this correct?

I'm not understanding what you're saying. The standard flush port is simply a normal garden hose fitting that screws on normally (turning it clockwise).

 

[DennisG01]

I have a more modern engine, 2020 4 stroke 250. My water is pressurized to 50-60 PSI (pressure bladder) and I run it full blast into the engine and it seems fine. Pee stream is pretty normal (weaker than my Suzuki kicker, that guy pees!) and I get water out of the prop and another place on the lower unit.

A little side note here... when comparing one engine model to a different one, the amount of "pee" is inconsequential. The pee is just an indication that water is getting to the port and, really, doesn't even indicate, definitively, if water is/isn't flowing through the engine.

Heck, some engines won't even pee while on a hose, at all.

The amount of pee is entirely based on where the pee circuit is tapped into the water circ system.

 

[seasick]

There is some water pressure at the flush port. If the port is not capped off, the internal water pressure can be lower than it normally would be. At higher speeds, a 'leaky' or uncapped flush port probably won't be a problem. It is doing what the poppet valve does, lower excessive water pressure by dumping cooling water.
I am not certain, but a stuck open poppet can cause low rev over heating but whether an uncapped flush port can lead to over heating is a question I don't know the answer to.

Don't assume that all flush ports work the same. On my previous boat with Mercs (Optimaxes) the flush port is under pressure and has a check valve in the flush fitting to stop leakage when the flush water is not connected.