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  #26   IP: 199.173.225.33
Old 03-04-2012, 09:59 AM
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IMHO - I would replace the exhaust hot section. From the looks of it, you could be very close to it rusting apart.
BTDT
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  #27   IP: 67.78.241.34
Old 03-04-2012, 12:56 PM
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Quote:
Originally Posted by joe_db View Post
IMHO - I would replace the exhaust hot section. From the looks of it, you could be very close to it rusting apart.
BTDT
Yeah, and it looks like the PO made it real easy, too...pipe union right off the manifold flange.
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  #28   IP: 67.183.79.110
Old 03-04-2012, 05:09 PM
junaido junaido is offline
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I guess I could do what this guy did. Put the intake hose in a bucket of water.
Are there any radiator flush type additives I can add to help flush out the system or is that a bad idea ?

[YOUTUBE]http://www.youtube.com/watch?v=quHnaK8kiW4[/YOUTUBE]

http://www.youtube.com/watch?v=quHnaK8kiW4

Junaid
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  #29   IP: 108.15.39.241
Old 03-04-2012, 11:21 PM
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Before you do anything else, take your water pump off, take it apart and change out any dubious parts. The most likely cause of no water flow is a bad impeller. A bad impeller can fall apart and the rubber crumbs get flushed into the rest of the engine, clogging passages. Once you get this fixed, stick the inlet hose in a bucket of water to see if the pump works.

Something to worry about: Typically there are rubber exhaust hoses downstream of where the water gets mixed into the exhaust. These can only take hot exhaust (without water mixed in) for a short time. They can melt or delaminate, causing the inner layer to slump and restrict flow, and eventually they can totally melt or even catch on fire if allowed to get too hot. Some boats have the exhaust exit under water, and if the rubber hose melts under the water line the boat can sink. So you want a healthy flow of water coming out of the exhaust.
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  #30   IP: 67.183.79.110
Old 03-04-2012, 11:44 PM
junaido junaido is offline
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Point taken about exhaust hose meltdown. Water pump investigation is at the top of our agenda for the next visit. We ran the engine for about 5-10 minutes total. Hopefully the hose survived that experience.
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  #31   IP: 67.237.207.128
Old 03-05-2012, 08:21 AM
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Junaido: You may be a step ahead if you can identify the type of water pump you have and get some gaskets/impeller for it before you remove/dismantle it. As posted it could very well be the pump but if you have not already done so I encourage you to check the simple stuff first. Dan S/V Marian Claire

Last edited by Marian Claire; 03-05-2012 at 08:25 AM.
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  #32   IP: 98.109.37.23
Old 03-05-2012, 12:27 PM
wmmulvey wmmulvey is offline
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Need A4 Help

J.

I suspect that you have an OBERDORFER water pump.

Below is a link for it.



http://www.oberdorfer-pumps.com/Spec...204%20page.pdf

This is NOT a self priming pump. If you are on the hard you must prime the pump to run the engine.

Do NOT attache a water hose under pressure to the water pump. You must pull the water from a bucket.


A suggestion to make life easy.

Buy a tee fitting and a gate valve.

1. Connect the raw water strainer hose to the tee

2. Connect a hose from the tee to the water pump

3. Connect a hose from the other end of the tee to the gate valve. Attache a hose long enough to reach the bilge (this will serve also as an emergency bilge pump) and to a 5 gal. bucket.

4. Attache some kind of strainer to the end of the long hose.


To pull water from the bucket, close the raw water inlet valve and open the gate valve.

This is also a great way to winterize the engine.

Bill

Last edited by wmmulvey; 03-05-2012 at 02:00 PM.
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  #33   IP: 67.183.79.110
Old 03-05-2012, 12:31 PM
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water pump impellers

Marian,

I posted a picture of it earlier in the thread. I think I can make out the word "Oberdorfer" on it. It seems to fit the pictures I have seen in the parts area, still not sure what the exact model is but it looks like impeller replacement is the same part #.

So based on my research, I am thinking impeller "Globe 815", Oberdorfer 6593 or Westerbeke 17556 will work in this pump.

Do the snap ring pliers need to be very specific for this particular pump or can you just use a generic snap ring plier ?

Junaid
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  #34   IP: 161.213.49.1
Old 03-05-2012, 12:33 PM
JOHN COOKSON JOHN COOKSON is offline
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My $.02 Worth

Did you prime the water pump by taking off the inlet hose and pouring water in and turning the engine over to get rid of bubbles? Maybe all you need to do is prime the pump to get it working. Still not pumping water?
Next step: See if you have water coming in through the the through hull fitting. If it is blocked one can usually get sufficient flow by attaching a clear piece of tubing (valve closed of course) supporting it above the water line cutting it off above the water line then open the valve and ream the passage through the valve with a piece of rebar or a long screwdriver.
Next Step: Repair the water pump if necessary so it pumps water. Even if it pumps water I'd inspect\replace the impeller real soon.
Next step: Disconnect the hose where the water exits the manifold. If there is a blockage of flow through the engine you'll have to figure out where it is.
Next step: Unwrap the hot to see what you have going on there. It looks kind of shot. You may need to replace the exhaust system from engine to back of boat.
This is only my approach. There are other approches that will work.

TRUE GRIT

Last edited by JOHN COOKSON; 03-05-2012 at 12:41 PM.
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  #35   IP: 67.237.207.128
Old 03-05-2012, 12:48 PM
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Junaido: Right I should have looked at the pic. As you and Bill did. The question is which Oberdorfer. My guess would be a early 202 model that uses the flat gasket. Also remember the water pump flange gasket. The Moyer on line catalog shows the different gaskets. http://www.moyermarine.com/cgi-bin/s...rebuilder.html
I used a generic snap ring pliers, as long as they fit the holes in the ring. Johns advice in post 34 about priming is very good. Dan S/V Marian Claire
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  #36   IP: 98.109.37.23
Old 03-05-2012, 02:02 PM
wmmulvey wmmulvey is offline
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Need A4 help

J.

Re-read my last post. I added to it

Bill

Last edited by wmmulvey; 03-05-2012 at 02:56 PM.
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  #37   IP: 208.54.32.135
Old 03-10-2012, 04:40 PM
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what next?

Checked the thru hull . Good.
Replaced water pump impeller.
Cleaned the place where water comes out the exhaust manifold.

Now with the hose off the manifold, I see a little dribble of water.
What do I do to debug this further?

Thanks,

Junaid
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  #38   IP: 24.152.131.155
Old 03-10-2012, 05:04 PM
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Pull the hose that goes into the manifold and test again, a very short test.
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  #39   IP: 75.93.210.219
Old 03-10-2012, 05:13 PM
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Do you have a raw water strainer/filter? Did you disconnect the hose entering the pump, exiting the pump, exit the T-stat dome and check for flow? The T-stat could be stuck closed and clogged. Dan S/V Marian Claire
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  #40   IP: 208.54.32.135
Old 03-10-2012, 05:24 PM
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No raw water strainer.

My understanding was that water goes into the engine from two pathways so thermostat was irrelevant to water not coming out of exhaust manifold.
JunaidJunaido
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  #41   IP: 208.54.32.135
Old 03-10-2012, 05:30 PM
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Just pulled thermostat, looks covered in black oily sludge.
is that normal?
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  #42   IP: 75.93.210.219
Old 03-10-2012, 05:37 PM
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I was thinking that if you have the late model set up with the by-pass and the by-pass control/valve is closed then all/most of the water will/try to go thru the block and the T-stat. Dan S/V Marian Claire

Last edited by Marian Claire; 03-10-2012 at 05:48 PM.
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  #43   IP: 208.54.32.135
Old 03-10-2012, 06:50 PM
junaido junaido is offline
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We removed the thermostat, pretty healthy flow of water going into the engine, a trickle (better than before but 1/5th the amount going into the engine from the t-stat dome) coming out of the exhaust manifold. Lots of exhaust gases coming out but not much water at all. We heard sizzling, steaming sounds coming after running engine for 5 minutes.

Last edited by junaido; 03-10-2012 at 07:05 PM.
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  #44   IP: 24.152.131.155
Old 03-10-2012, 07:21 PM
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Looks like you're headed for manifold cleaning/replacement. Check the square elbow at the manifold inlet for obstruction and if none I'd say the manifold itself is the likely culprit.
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  #45   IP: 208.54.32.170
Old 03-10-2012, 08:32 PM
junaido junaido is offline
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How do you clean the manifold? Is it the muriatic acid thing or hire a mechanic?
We are stumped.
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  #46   IP: 24.152.131.155
Old 03-10-2012, 09:10 PM
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Muriatic acid will do no good if you can't get it in there and from the sounds of your restricted flow you can't. I suggest complete removal of the manifold so you can get after it on the bench, I think you're headed that way anyway.

Before anything else you should perform a pressure test. There are threads on this forum describing the technique. There's no point in cleaning out a manifold that's rusted through. If you are uncomfortable with this test an engine shop can do it easily. If it fails the test, replace it and be done.

There are 2 freeze* plugs on the side of the manifold than can be removed to gain access to the water jacket portion. Through there you can poke, prod or whatever to clean her out. Solvent won't do any good. You may even consider taking it to an engine rebuilder or radiator shop for a "boil out". Once the clean out is complete these holes can be filled with replacement freeze* plugs or tapped for threaded pipe plugs.

*The common term "freeze plug" is a misnomer, not there for freeze protection at all. It is actually a "core plug" that fills a hole necessary in the casting process. I inaccurately called it a freeze plug here only due to the common usage and recognizable appearance.
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  #47   IP: 208.54.32.170
Old 03-11-2012, 12:13 AM
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Well I I guess we have to go the outboard route. Seemed like we were so close to getting it going...
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  #48   IP: 24.152.131.155
Old 03-11-2012, 01:40 AM
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Do you already have an outboard? If not, it might cost the same or less to replace the manifold, probably take less time too.
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  #49   IP: 75.93.210.219
Old 03-11-2012, 08:24 AM
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Junaido: What Neil said. But before you give up. How is the access to the manifold? Could you remove the two fittings and clean them and try and clean the manifold inplace? As best as I can tell there is no indication of a manifold leak it seems to just be plugged. I used a water hose and a wire to flush out the water passages of my spare manifold. If it is just impacted goo it may clear. It may make a mess but you could drape the engine to cut down on some of the mess. I do not know how the passages line up in the manifold so this idea may not work. FWIW. Dan S/V Marian Claire
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  #50   IP: 96.248.13.91
Old 03-11-2012, 09:01 AM
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Quote:
Originally Posted by junaido View Post
Well I I guess we have to go the outboard route.
Why so?

Quote:
Originally Posted by junaido View Post
Seemed like we were so close to getting it going...
Exactly. Which is why I'm unclear as to why you are thinking you should just starp an outboard on?

It's fixable. Truly it is.
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