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Author Topic: Do I have an exhaust water leak?  (Read 8737 times)

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britinusa

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Do I have an exhaust water leak?
« on: July 06, 2016, 07:04:50 PM »

We get about 1.25" of water with black particulate in the bilge after a 45 minute motor (ie. typically during the trip from the Ocean to the slip)

Today we pumped it out, about 1.75 gallons.

It's black, but does not appear to be particularly oily.

We dried out the bilge and did an initial clean up.
Also wiped down the sides of the aqua lift muffler plastic tank.

Then ran the engine at low to not so low revs for about 10 minutes.

No sign of the water leak from viewing under the aft berth or the head cupboard.

Plan is to check paper towel strips by the Aqua lift during the next trip.

Any suggestions to finding this leak much appreciated.

There is no One Hump tube just a regular exhaust tube from the riser to the aqualift.
No sign of water leak from the exhaust tube at the thru hull in the aft locker.

Paul
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Paul & Peggy
1987 C34 Tall Rig Fin Keel - Hull # 463

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britinusa

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Re: Do I have an exhaust water leak?
« Reply #1 on: July 07, 2016, 10:16:12 AM »

Left the collected water in a jug overnight. After 24 hours, no oil floating on top, the particulates were not clumped but could be seen easily.

When I pumped out the bilge, I put the water in 2 jugs. The first jug was from the lower part of the water in the bilge, the second contained the remaining water. The first jug's contents were almost clear, the second was the nasty stuff.

Plan is to take the boat out for a motor on Friday and inspect it every few minutes looking for leaks.

Paul
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Paul & Peggy
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Ron Hill

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Re: Do I have an exhaust water leak?
« Reply #2 on: July 07, 2016, 03:06:03 PM »

Paul : If there is no oil in that black water, I'll guess that you have a leak in the lower exhaust riser and/or the muffler.  Or the exhaust hose into or from the muffler??

A few thoughts
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Noah

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Re: Do I have an exhaust water leak?
« Reply #3 on: July 07, 2016, 03:38:15 PM »

Whatever the case may be, while you are there, add a hump hose.
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KWKloeber

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Re: Do I have an exhaust water leak?
« Reply #4 on: July 07, 2016, 04:58:24 PM »

Paul

Does your crankcase vent hose hang into the bilge, or go to the air intake?

kk
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britinusa

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Re: Do I have an exhaust water leak?
« Reply #5 on: July 07, 2016, 05:24:50 PM »

Hmmm, Not sure, I'll inspect it tomorrow.


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KWKloeber

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Re: Do I have an exhaust water leak?
« Reply #6 on: July 07, 2016, 05:34:05 PM »

Possible that blow by is tossing a lot of crap into / floating in the bilge?

ken
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britinusa

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Re: Do I have an exhaust water leak?
« Reply #7 on: July 09, 2016, 06:45:38 PM »

got down to the boat today to measure for the Hump Hose.

I have ordered the 8" hose (existing hose is about 7" long)
Also ordered the engine to riser gasket & anti everything gooe.

forgot to look at the crankcase hose.

So either Sunday or Monday for that.

I keep my dremel on board so it should be easy (ha!) to cut out the hold hose.

Paul
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Stu Jackson

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Re: Do I have an exhaust water leak?
« Reply #8 on: July 10, 2016, 07:48:03 AM »

Paul, some Tip & Tricks about some of the work you are about to do are in this recent Tech Notes article:  http://www.c34.org/mainsheet/html/2016/Muffler%20&%20Exhaust%20Riser%20Replacement.html
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britinusa

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Re: Do I have an exhaust water leak?
« Reply #9 on: July 10, 2016, 09:14:18 AM »

Thanks Stu, I had not seen that article (probably did in the original Mainsheet article)

? - The nuts on the exhaust manifold appear to be new - Did you replace them or was that during an earlier project?

Any chance you have a link to repairing the muffler - just in case I find the need when I cut off the old input hose.

Paul
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KWKloeber

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Re: Do I have an exhaust water leak?
« Reply #10 on: July 10, 2016, 09:21:05 AM »

Paul

I previously posted a PFD article from another who repairf a comprehensive repair on an aqualift.  It's on the techwiki - look under the engine topics.

Kk
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KWKloeber

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Re: Do I have an exhaust water leak?
« Reply #11 on: July 10, 2016, 09:23:22 AM »

PS.  Evaluate your flange condition - you may want to have new studs at the ready. 
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Stu Jackson

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Re: Do I have an exhaust water leak?
« Reply #12 on: July 10, 2016, 10:42:43 AM »



? - The nuts on the exhaust manifold appear to be new - Did you replace them or was that during an earlier project?

Any chance you have a link to repairing the muffler - just in case I find the need when I cut off the old input hose.


Paul, those are the original 1986 nuts on the studs.  I forget the thread, so if you need new nuts, take one off and go to a well stocked hardware store, make sure you get the right thread, fine or coarse.

Repairing the muffler shouldn't be necessary unless you really F-up the removal of the old hose.  Just use a box cutter and work slowly.  You may have to use a wire cutter to get the wire reinforcing off, but if you've gone that far, then the hose should come off.

You may be interested in this:  "What's in Your Muffler?"

http://c34.org/bbs/index.php/topic,6728.0.html

Ken's pointers and links are great, too.
« Last Edit: July 10, 2016, 02:17:46 PM by Stu Jackson »
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KWKloeber

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Re: Do I have an exhaust water leak?
« Reply #13 on: July 10, 2016, 11:47:27 AM »

The studs are UNF thread on the nut end and UNC thread on the manifold end, and 2 different lengths.

See the parts manual on TW

Some have used red RTV on the exh gasket.  Not saying that's a good or bad idea, but if you do, make sure you don't  ooze any  into the water ports on the manifold.

kk
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Twenty years from now you'll be more disappointed
by the things you didn't do, than by the ones you did.
So throw off the bowlines.
Sail away from the safe harbor.
Catch the tradewinds in your sails.
Explore. Dream. Discover.   -Mark Twain

britinusa

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Re: Do I have an exhaust water leak?
« Reply #14 on: July 10, 2016, 12:22:53 PM »

Thanks Ken & Stu.
Those links say it all.

Will take lots of pics as I progress the hump hose install & muffler repair if found it's needed.

Paul
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