Need A4 help and guidance in Bellingham WA

[Marian Claire]

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

[wmmulvey]

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_sheets/202M%20Series%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

[junaido]

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

[JOHN COOKSON]

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

[Marian Claire]

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

[wmmulvey]

Need A4 help

J.

Re-read my last post. I added to it

Bill

[junaido]

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

[ndutton]

Pull the hose that goes into the manifold and test again, a very short test.

[Marian Claire]

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

[junaido]

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

[junaido]

Just pulled thermostat, looks covered in black oily sludge.
is that normal?

[Marian Claire]

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

[junaido]

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.

[ndutton]

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.

[junaido]

How do you clean the manifold? Is it the muriatic acid thing or hire a mechanic?
We are stumped.