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Author Topic:   Engine Flush on the Mooring?
minimontauk posted 02-06-2003 12:54 PM ET (US)   Profile for minimontauk   Send Email to minimontauk  
Anyone know a tricky method for running fresh water through the engine out on a mooring? My mooring is too far from a fresh water source to flush it and then row out to the mooring. I am trying to picture some kind of gravity feed setup with a hose, ears, and bucket. Am I out of my mind?
Bigshot posted 02-06-2003 01:39 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You could use a bucket and drill a hole in the bottom and insert a fitting and a hose that runs to the earmuffs. The gravity and water pump would allow the engine to flush. I would setup a turnoff at the bottom of the bucket fitting so that once you are in place, turn and start the engine. this may be a 2 person deal though. You would also need to fill the bucket and then bring it out to the mooring, let the water drain from the tilted engine, then fire it up. You may also have to disconnect a mercury switch that would not allow the engine to run in the tilted position but they are only in Mercs. If you always bring a cooler with you and the cooler is always water by days end, you could rig up the cooler as well instead of a bucket.
andygere posted 02-06-2003 07:04 PM ET (US)     Profile for andygere  Send Email to andygere     
My Merc mechanic warned against using earmuffs with the motor tilted, something about water backing up through the exhaust. Not sure if there is truth to it, but why chance it. With a tight enough set of muffs, it might work with the motor down.
Bigshot posted 02-07-2003 10:39 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Won't work with engine down in the water. It will help but salt water will still be sucked in. I do not think it will effect it to run tilted, but I would not do a marathon. Flush a gallon through and shut it down.
Bigshot posted 02-07-2003 10:43 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Oops...reason I say that is because when you flush the newer ones you do it in the tilted position and backflush through the exhaust with engine not running. The only thing I can see is that gas may not flow right being in tilted position. I also think that people flush their engines too long to begin with. When you shut down an outboard it drains the block(unlike I/O's etc. Therefore you opnly need to run it long enough for the fresh water to circulate and come out. If engine is hot and thermo is still open, this takes literally seconds. On an I/O you have to run it util all the salt water exits the block and fresh water replaces it. This is several gallons, etc.
weekendwarrior posted 02-07-2003 12:50 PM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
Re: flushing for too long - I don't have the book in front of me, but I believe it recommended a minimum of 10 minutes on the flusher after use in salt.

Also flushing while tilted, I believe the worry is that some of the water in the exhaust water jackets may get back into the cylinders. I'm not sure where the holes are to blow the water from the jackets into the exhaust but if they're close to the exhaust ports then I could see it as a possibility.

Bigshot posted 02-07-2003 01:00 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
10 minutes.....that is lawyer talk. If you fill a metal bucket with salt water then dump it out, does it take ten minutes to rinse it? With my 454 I run it until the water coming out the thru-hulls tastes fresh then I shut it down. You could do the same with an outboard but the 2 stroke oil might give your taste buds a false reading;) I personally think that running it on ear muffs for 10 minutes and then shutting it down would do more long-term damage internally than the salt water would due to carbon and splooge from idleing on muffs.
weekendwarrior posted 02-07-2003 07:41 PM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
Actually I just found the reference in my Clymer manual for Honda. Page 156, step 4 under Flushing the cooling system in the maintenance section; "Continue to run the engine for a minimum of 10 minutes....".
Then to double check I pulled out the Honda motor manual that came with the motor and it says "allow the engine to run at idle for at least 5 minutes to clean the inside of the motor". Either way, it looks like you need to let it run for several minutes. I assume some salt and other deposits build up in there and can take some time to disolve.

doobee posted 02-07-2003 10:22 PM ET (US)     Profile for doobee  Send Email to doobee     
I have the perfect solution to your problem.

Moor your boat on a fresh water lake:)

Actually, many newer motors have a fitting that allows you to flush with a standard garden hose. The fitting is usually located near the tilt tube. Check with your dealer to see if this could be retrofitted. Perhaps there is a similar aftermarket item available. Sierra makes a lot of aftermarket parts for outboards. If this is possible, then you could gravity feed from a bucket.

Whale on!

aubv posted 02-07-2003 10:49 PM ET (US)     Profile for aubv  Send Email to aubv     

Not wanting to assume anything.

What boat and motor are we talking about?

A major flush at the dock and then using a cooler(has hose bib already) filled with fresh water, hose and muffs seems to be a pretty easy solution, to rinse at the mooring.

I've flush my engine at the dock by putting on the hose and muffs and then tilting the engine into the water. It's quite and after flushing I shut of the engine but leave the water running until the engine is tilted clear of the water.

captbone posted 02-08-2003 01:45 AM ET (US)     Profile for captbone  Send Email to captbone     
I dont know how you get out to the mooring but I would say flush it at the dock and either slip the launch operator some bills or a small outboard for the rowboat to tow it. If it is a nice day, just break out the paddles.
minimontauk posted 02-08-2003 01:35 PM ET (US)     Profile for minimontauk  Send Email to minimontauk     
Thanks for the suggestions. I actually hadn't even thought about the fact that the motor will be tilted up. I like the fresh water lake idea, if only I can find a way to desalinate the Atlantic, I'll be all set! This might be worth a call to Johnson Tech.

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