I thought I was watching a pump rebuild? Replacing the impeller is easy now let’s see a video of replacing the bronze bush, a new shaft and the two seals to keep water out of the engine then I’d be impressed.
Indeed I omitted to change the lip seals on the video, a thing that I did later without doing another video about it. It's a really easy task to do though. The specific pump does not have bearings, the shaft just goes through the lip seals. Most probably you know how to fix yours, but if there is something I can assist in, send me a message.
I viewed your video with great interest because I also have an MD2B but for reasons I can't explain, the pump in your video is turning counter-clockwise (based visually on the impeller vane orientation) while mine turns clockwise. When viewing my flywheel from the same end of the motor as the water pump, the flywheel turns counter-clockwise. Since the camshaft is gear driven from the crank, it will turn in the opposite direction or clockwise viewed from the water pump end. Therefore the water pump will also turn clockwise. I am hoping you will see my comment and maybe have an explanation for the apparent difference?
HI! The camshaft indeed turns clockwise and no matter how you install the impeller it will set blades on the correct orientation when the engine starts. You don't have to worry about it. Also when you stop the engine, sometimes the flywheel might half-turn c-clockwise from compression in the cylinders. That will make the blades turn to the other side until you start the engine again. Hope I covered your question
I was entering chat history to check on this. Apparently the design of this engine totally thought through for endurance. Mine is mdb2(15hp) but has few differences. Many Components are the same.
Hello everyone! The most recent repair I had to do in the pump, was to enlarge the shaft hole and install a phosphor bronze bushing. The shaft had eaten out the cylinder casting, resulting in unwanted shaft play, damaging the lip seals quickly. Now the shaft is supported very well by the new bushing. Any pumps without ball bearings might need a new bushing every few years.
That is no way to remove an impeller cover. Screws should be released gently one by one opposite eachother. And glycerine should be used to lubricate the impeller, not grease. The method used in this video is inviting a distorted cover and damaged screws.
Good info thanks. The video has mistakes that's why I recommend to the watchers reading the updates in the description and the comments also, as the most important information sits there.
Glycerin will help for installing the impeller but it will be washed quickly. Grease will stay for some time but eventually it will be washed too. I didnt do it in the video, but another important thing is to put grease on the gasket so you have a watertight connection.
@@svakestor7219 Regular grease for bearings and such is not good for the rubber. I guess if you do this shortly before using the engine, it will not have time enough to do any damage before most of the grease is flushed away with the water but I would not let it sit greased for a long time. There is grease that doesn't damage the rubber like silicone grease.
@@skunkjobb I agree 100%. I don't put any grease anymore because it's not good for the impeller and it will wash out also, so why put it? . CurrentIy I don't put any grease at all, just a few drops of oil to easily pass the shaft in and that's all.
@@noskanow You are welcome. Better to turn the impeller until it goes in. I usually remember where the camshaft approximately rests and turning the impeller around that location.( For example at 12 o'clock)
hard to say i am also looking for new ones. i went with old sample and i bought new ones but they were leaking as they were softer rubber than originals, so i kept on the old seals and they are still ok.
I finally found here new seals akron-hellas.gr/en/products/types this is not a shop were you can order but to know what kind of store to look for in your area. There should be several shops selling industrial seals. I bought them 1 euro per piece. . The size is OD 1 Inch, ID 1/2 inch. Good luck!
I omitted this on the video: Internal lip seal (water) goes with the spring facing the stern, and the 2nd (oil) with the spring looking at the camshaft. . Care is needed to not block the weep holes with the side of either seal.
I thought I was watching a pump rebuild? Replacing the impeller is easy now let’s see a video of replacing the bronze bush, a new shaft and the two seals to keep water out of the engine then I’d be impressed.
Indeed I omitted to change the lip seals on the video, a thing that I did later without doing another video about it. It's a really easy task to do though. The specific pump does not have bearings, the shaft just goes through the lip seals. Most probably you know how to fix yours, but if there is something I can assist in, send me a message.
Very interesting to see the internals of this pump and how mechanically simple it is (which I very much like, less to go wrong).
Thanks for watching!
It's a relief for me.. I just bought a boat and I believe the pump is similar to the one on my boat lol
Δεν το πιστεύω ότι βρήκα ένα άνθρωπο μερακλή σαν εμένα , μπράβο ετσι αξίζουν τα αληθινά μηχανήματα !!!
Ευχαριστώ πολύ! εσύ με τι καταπιάνεσαι?
I viewed your video with great interest because I also have an MD2B but for reasons I can't explain, the pump in your video is turning counter-clockwise (based visually on the impeller vane orientation) while mine turns clockwise. When viewing my flywheel from the same end of the motor as the water pump, the flywheel turns counter-clockwise. Since the camshaft is gear driven from the crank, it will turn in the opposite direction or clockwise viewed from the water pump end. Therefore the water pump will also turn clockwise. I am hoping you will see my comment and maybe have an explanation for the apparent difference?
HI! The camshaft indeed turns clockwise and no matter how you install the impeller it will set blades on the correct orientation when the engine starts. You don't have to worry about it. Also when you stop the engine, sometimes the flywheel might half-turn c-clockwise from compression in the cylinders. That will make the blades turn to the other side until you start the engine again. Hope I covered your question
I was entering chat history to check on this. Apparently the design of this engine totally thought through for endurance. Mine is mdb2(15hp) but has few differences. Many Components are the same.
Hello everyone! The most recent repair I had to do in the pump, was to enlarge the shaft hole and install a phosphor bronze bushing. The shaft had eaten out the cylinder casting, resulting in unwanted shaft play, damaging the lip seals quickly. Now the shaft is supported very well by the new bushing. Any pumps without ball bearings might need a new bushing every few years.
Great video, very helpful, thank's for posting!!
Glad it helped!
That is no way to remove an impeller cover. Screws should be released gently one by one opposite eachother. And glycerine should be used to lubricate the impeller, not grease. The method used in this video is inviting a distorted cover and damaged screws.
Good info thanks. The video has mistakes that's why I recommend to the watchers reading the updates in the description and the comments also, as the most important information sits there.
Thank you for the infomative Video. Isnt Glycerine the right thing to lubricate the impeller? Never Seen fat beeing used
Glycerin will help for installing the impeller but it will be washed quickly. Grease will stay for some time but eventually it will be washed too. I didnt do it in the video, but another important thing is to put grease on the gasket so you have a watertight connection.
@@svakestor7219 Regular grease for bearings and such is not good for the rubber. I guess if you do this shortly before using the engine, it will not have time enough to do any damage before most of the grease is flushed away with the water but I would not let it sit greased for a long time. There is grease that doesn't damage the rubber like silicone grease.
@@skunkjobb I agree 100%. I don't put any grease anymore because it's not good for the impeller and it will wash out also, so why put it? . CurrentIy I don't put any grease at all, just a few drops of oil to easily pass the shaft in and that's all.
Do you know the part numbers for the oil and water seal please?
Any chance you want to come to vacation in San Francisco and help me fix my MD2B ?
Would be nice but we are half world far!
Can the impeller and shaft be pulled out from the front with the pump still bolted to the engine?
Absolutely. No problem with that. The installation afterward has to be gentle for not damaging or displacing the sealing rings.
@@svakestor7219 Thank you. Is it best to hand crank the engine to relocate the pump shaft, or to turn the impeller?
@@noskanow You are welcome. Better to turn the impeller until it goes in. I usually remember where the camshaft approximately rests and turning the impeller around that location.( For example at 12 o'clock)
@@svakestor7219 Thank you very much for your excellent video and very helpful advice.
Where do you get oil and water seal for this pump? And the axl?
hard to say i am also looking for new ones. i went with old sample and i bought new ones but they were leaking as they were softer rubber than originals, so i kept on the old seals and they are still ok.
I finally found here new seals akron-hellas.gr/en/products/types this is not a shop were you can order but to know what kind of store to look for in your area. There should be several shops selling industrial seals. I bought them 1 euro per piece. . The size is OD 1 Inch, ID 1/2 inch. Good luck!
@@svakestor7219 Thanks nice of you:) Got a new one now. No more leaks :D
Get the seals from Volvo after market seals have steel sealing springs that rust Volvo uses stainless
how about to change oil and water seals?
I omitted this on the video: Internal lip seal (water) goes with the spring facing the stern, and the 2nd (oil) with the spring looking at the camshaft. . Care is needed to not block the weep holes with the side of either seal.
Do you know the p/n of this pump?
whats p/n stands for?
@@svakestor7219 I think he was asking for the part number.