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Using 600 grit watching Dracula.

 

Any chance I can use electric sander? 

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5 minutes ago, Tony Brooks said:

As Tracy says the end plate is well worn, this is perfectly normal as the years go by. The face of the pump body the the side of the impellor will be similarly worn so both together tends to stop the pump priming. The back cover was perfectly flat when it was new. The recess where the impellor runs is wear so I am with Tracy on this. A sheet of emery paper on glass to give flat surface and start rubbing in a circular motion, twisting the cover in your hand every say 10 circles to even out any tendency to make the face angled. Do this until its flat.

 

Some pumps have a wear plate inside the body of the pump trapped behind the cam but I don't think yours does. If it did you could reverse that but no such luck I think.

 

I can't see any signs of a worn oval hole in the end plate but am not so sure about pump body - too much grease and much in there. One image seems to indicate the shaft sat an an angle in the body but it could just as well be camera angle. This is why I keep asking about lift or play between shaft and pump body.

 

Never, ever fit more than one gasket. If you do it tends to prevent the cover making a good seal to the impellor so again a lack of priming and reduced flow.

Ok Tony I am going to degrease the pump now, and there is no play or lift between shaft and body its quite solid and spins well.

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3 minutes ago, Alan de Enfield said:

OK, mine has an O Ring.

 

It is best practice to always replace gaskets when reassembling, it avoids a lot of potential leak problems and you are going to be spending so much money on that boat, a few pennies more to do the job properly is really worth it.

Oh no I was not suggesting to reuse them just was a general bit of information.

 

Main blockage wedged in hard.

 

 

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3 minutes ago, Alan de Enfield said:

The bearing face for the impellor is set lower than the flange so I doubt that cleaning the face using glasspaper and a sheet if glass will make any improvement, and the gasket will take up any minor damage between the pump body & face plate anyway.

 

It is the recessed face that is a 'bit chewed up' and needs 'looking at'.

 

 

When you order a new impellor make sure you order the 'kit' not just an impellor.

 

The kit will give you all the bits you need including gaskets, O'Rings and a tube of lubrication (to stop it burning out when you start the engine because it is running dry)

 

 

When I took of the impeller cover there was no O'Ring but it had two gaskets fitted both in good condition.

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1 minute ago, Alan de Enfield said:

The impellor has shredded because it was running dry, this can only mean that the water blockage was before the pump.

 

What is before the pump ?

 

1) Your wonderful pipe end filter.

2) The pipe leading into the boat.

3) The pipe from the inside of the boat to the oil cooler

4) The oil cooler

5) The pipe from the oil cooler to the pump.

 

Maybe the external filter picked up a plastic bag which was sucked onto the filter and stopped the water flow, once the impellor stopped working the suction would drop and the bag fall off the filter and float away (I have had it happen)

 

Carefully check each component (numbered 1 to 5) and if they are all clear (and clean) then rebuild the pump and start to work forward component by component (you have already made big inroads into the job by disassembly of the heat exchanger).

I have just organise everything you just said with photos, I am now quite sure the hose from the back of boat to oil cooler is the main inlet and that oil filter has two mesh filters that will catch anything before it gets into the pump, this explains why I have only found rubber in the system and no weeds at all.

 

But remember going back in this thread I did say I after moving my boat notice it never had the end hose filter on the pipe, and that I undone the hose area where the pipe joins both sides of the oil cooler and there was weed/algae on the first mesh and the second mesh was clear other side of the oil cooler.

 

I will post these photos once Tony has got back to me regards the wear on the cover plate. 

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Tony I can 100% confirm that the core had impeller rubber in it but clear of any weeds, in fact the whole system was clear of weeds, I held the Heat exchanger core to the sun after using a fine jet to clean every tube and can confirm every tube was clear.

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Pump photos, I do have more of the whole pump if needed.

 

 

 

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TheBiscuits Thank you for the details and correction.

 

Tony I saw a water drop fall from the front part of the water pump and I think I might have noticed it a few times before.

 

When you say heat exchanger core do you mean the round tube with the thin copper pipes encased in it?

 

Photos to follow.

 

 

 

 

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Impella video with inlet bar.

 

 

 

 

 

Just a note I have taken the whole pump off and have it at home with me, to service and replace parts, again I ask can anyone link me to the impella I need to buy.

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Impella please can someone link to me the replacement I need to buy.

 

 

 

 

 

 

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Heat exchanger videos

 

 

 

 

 

 

 

 

 

 

 

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Heat exchanger inside housing and outside rod, rubber was found in rod.

 

I am posting lots of pics for people that might need info in the future, my way of paying back this forum for helping me.

 

 

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Video of rear water flushing 

 

 

 

Video outside boat checking flow

 

 

8 minutes ago, Alan de Enfield said:

That filter is an absolute gem of inventiveness and should go into the forum archives of DIY greatness.

 

However it is not really suitable and should be replaced by a properly designed (and sized) filter.

How does the pipe go thru the back of the boat ? (can you do a picture of it going thru from the outside and also another (taken from the inside) as it comes inside.

I am willing to buy a filter I just can't seem to find one.

 

and yes I have a pic of the inside hose.

 

 

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5 minutes ago, WotEver said:

You already know those holes are way too big on that filter, so I won't point it out again...

 

oops...

It worked for 4 years nothing got in, the algae surrounds it and acts like a membrane only reason I now have this problem is after 4 years the metal bolt I used to connect the flask to the pipe corroded and this is why I have this problem now, all happened during the last move I made 4 weeks ago, I did not notice no filter was on the pipe until after I had moved.

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Water pump photos

 

 

A question the two brass caps are they supposed to be fully tightened or tightened over time to push grease in to the pump? 

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Diy boat filter, the flask from amazon and the red thing a rubber glove, used cable ties to join to pipe as last filter a metal bolt melted over the years.

 

 

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I have just got back and have loads of photos and videos, I will upload them and link to youtube the videos, I am going to try put them in some order and things changed as I progressed, for example I might say I can't get this off and then in another video I got it off.

 

I will upload in stages to try keep some order so part one will be when I arrived and I will show you the water filter for interest, all videos will be numbered as a reference.

 

I have done more then I thought I could have done, and it is all down to all of you who have replied in this thread, it might not have looked like I paid attention but I took it all in.

 

Ok roast dinner time, then I will add media.

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Tony I have the gasket and will soon be going to the boat, I have made up two scoops to remove the water oil mix under engine to get better photos and I have printed two of your longer posts so I can read while I am on the boat and in some of the cases act on.

 

Alan I have one of them it was on the boat when I bought it, only problem is it will be in my shed, hopefully.

 

Harold I won't walk away from this thread I will make sure it is updated so anyone in the future can reference it, also I want to get more knowledge of my boat so will stick around after it gets fixed.

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Thanks Alan I will rig up a mirror that will allow me to watch flow while moving the boat.

 

 

Mad Harold, I have placed an order for brass mesh, could not get 2mm got 2.5mm, thanks for the information, I got enough to mess about with.

Mad Harold

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2 minutes ago, Alan de Enfield said:

Just to repeat, reinforce, what Tony is saying, when you have raw-water (river / canal / sea) cooling then it is imperative that checking and cleaning the inlet filter is one of the jobs on your pre-start up check list.

 

EVERY time before starting the engine it should be checked.

 

If the water is badly affected by weed you should be checking the exhaust flow every 'few' minutes, and if there is no-flow then stop the engine. even 5 minutes without water can destroy the impellor.

Just a belt and braces job, but I carry both spare impellors and a complete spare pump, it is sometimes easier to replace the pump than try and replace the impellor in situ, you can then 'service' the pump at your leisure.

I am up for buying a pump and replace it then service the old pump, have you any idea of where and what pump to order, or best wait until I get more detailed photos?

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Just now, Alan de Enfield said:

That would suggest that the water is very 'polluted' with weed, and the filter was doing its job, replacing it with a filter that doesn't block means that the 'muck' is going thru the filter (the holes are too-big) and getting into your system, hence the 'green stuff' in the oil cooler.

The Filter does work I agree it is not the best filter, I am not trying to save money I just could not find a filter that would do the job, Tony said it is in an area that would draw in weeds and that I found to be very true, and the first flask filter I made got covered in like a algae and this in fact offered a finer filtration I noticed even though it got cover the water came in through it and I had a nice flow, every once in a while I would give it a few wipes with my deck broom and carry on, this lasted 4 years without issue. 

 

I do feel this is the area that the water for the heat exchanger/engine is coming in and agree that I should put in place a isolation valve and strainer once I get better photo I would take suggestions on how to go about this.

 

My Boat

 

 

 

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The boat is a Norman 23, the engine I was told when I bought it is a thornycroft 108, but also was told on this forum that it was a BMC 1.8D in a post I made back in 2018.

 

The filter from the river hose coming out the back of the boat I did explain that it was a DIY job made by me as there was no other filter on that hose when I bought the boat, I did try a mesh filter but it clogged up within hours, so used a metal flask with holes drilled into it.

 

I apologize if I am not offering up enough information, I just got a bit overwhelmed with the information and diagrams, but very grateful for it and am now getting a better understanding of what I need to do

 

When I get the thermostat gasket I hope today, I did say I will take pics of all the areas of the engine.

 

I  appreciate all the help 

 

 

 

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T

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