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post #21 of 33 Old 05-22-2013
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Re: Slow water output at exhaust

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Originally Posted by THEFRENCHA View Post
I did that Unplugged the hose to elbow and there was a nice flow
It looks like I am going to remove the elbow see if clogged or just run phosphoric acid through the engine and give the water system a good clean up
Be careful with phosphoric acid, I know it's used in a lot of daily products but, when heat is add, I hear it may cause damage to some plastic. Not knowing what you have in the way of a muffler box, I would use some caution

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post #22 of 33 Old 05-22-2013 Thread Starter
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Re: Slow water output at exhaust

You are right Poopdeckdaddy...never heat phosphoric acid
The way I plan to do it

Material needed:

Acid in bucket
Bucket higher than engine
Electric bilge pump in bucket
hoses and adapters

Process:

Disconnect water hose at elbow and connect to hose from bilge pump in bucket
Disconnect water hose on output of water pump , connect long hose and send back to bucket
This is a back flush
Send acid from bucket through heat exchanger and back to bucket

After an hour heat exchanger will be cleaned and acid in bucket very dirty

During the process I will disconnect the complete elbow from the engine and let it soak in bucket until clean

This should fix my problem!
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post #23 of 33 Old 05-22-2013
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Re: Slow water output at exhaust

Muriatic acid is highly recommended for flushing raw water coolers. Flush with a baking soda solution when done.
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post #24 of 33 Old 05-22-2013
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Re: Slow water output at exhaust

My vote is for a partially plugged mixing elbow. Very common problem on Yanmars. I just replaced mine.
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post #25 of 33 Old 05-22-2013
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Re: Slow water output at exhaust

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I have been having nightmares with overheating this season, I boat in the winter. I replaced the raw water impellor with a new one at the beginning of the season and later on I replaced it again. Both were brand new impellers. Is it possible I have gotten two defective impellers? It would explain a lot.
The one that went bad on me had maybe 20 hrs on it tops. It always boggles my mind that such a critical compotent is a little rubber thinggy.
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post #26 of 33 Old 05-22-2013
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Re: Slow water output at exhaust

Although I have never experienced it myself, these seem like similar symptoms I've read about that happen when the rubber part of the exhaust hose gets old starts to delaminate on the inside. You can end up with a "flap" coming loose and obstructing the passage. Water builds up in the hose until there's enough pressure to push the piece out of the way, then it might say open for a while as long as water is flowing past giving you a nice stream for a while. If there's enough of a break in the water stream (from the muffler, etc) the loose piece may fall back down, closing off the passageway again until enough pressure builds up again.

I haven't seen this myself, but remember someone writing about it and how long it took to figure it out. Might be worth checking out.

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post #27 of 33 Old 05-22-2013
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Re: Slow water output at exhaust

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Originally Posted by LinekinBayCD View Post
The one that went bad on me had maybe 20 hrs on it tops. It always boggles my mind that such a critical compotent is a little rubber thinggy.
The impellers all appeared to be OK. I have been thinking that the impeller was not working properly. It did occur to me that the rubber was not moving with the brass portion but turning it by hand everything turned proved nothing. Right now I'm 1200 miles from my boat so checking the impeller again, will have to wait until I return in October.
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post #28 of 33 Old 05-23-2013
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Re: Slow water output at exhaust

"Faster" in post # 4 has a good explanation of how the lift muffler sometimes works.
I have had 3 Yanmar engines. Two were raw water cooled and the other had a heat exchanger/fresh water system. They all did that odd spurting thing you describe. The key seems to be the regularity of the water outflow. If it is steady and consistent and the water is not too hot to place your hand under, it may not be a problem at all. The 'steam' you describe could be just because the ambient air is particularly cold where you live? If it does not burn your hand it is nowhere near boiling.
Recently I changed my 2GM-20's impeller simply because I thought it was about time (in excess of two years and 600 hours). I was surprised that it was almost trashed. Several blades were broken off and most of the others badly worn. But the engine showed no sign of distress and fitting a new impeller made little difference to the water outlow pattern, or temperature. Tough babies, those Yanmars, but from now on I will look at the impeller a little more frequently. Maybe every 18 months - must not kill it with kindness....
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post #29 of 33 Old 05-23-2013
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Re: Slow water output at exhaust

I dealt with overheating and one thing I learned is that it's very very hard to judge water output at the exaust. Its always irregular. I ended up having a year old peice of broken impeller in my system that shifted just enough to suddenly be a problem after not causing an issue for an entire season.

I'd make sure to have an IR gun on hand to accurately measure temperature.
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post #30 of 33 Old 06-01-2013 Thread Starter
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Re: Slow water output at exhaust

So I cleaned the mixing elbow and flow at exhaust has improved Not perfect but at least more regular even if still not as much water as it used to.
The good thing is that now the engine does not overheat anymore.

I found a tiny dripping on water filter ( old glass Racor ) Could that be part of the problem ? It's very clean but ...

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