Unfortunately the faceplate on the water pump for impeller access is backward, so removal is difficult. Has anyone any suggestions to ease my impeller replacement. How about removing the entire pump assembly and replacing the impeller that way??
impeller replacement on Yanmar 2GM20F
- Thread starter prdewolf
- Start date
- Status
Just replaced mine
Globe 6541 was the impeller on my 2GM20F (2001 290 Hunter) We had some confusion with a local Yanmar dealer who insisted it was something else. You do have to remove the entire assembly and turn it around to undo the screws that release the cover to the impeller. I do not know the gasket number (anyone else know?). Paul
Globe 6541 was the impeller on my 2GM20F (2001 290 Hunter) We had some confusion with a local Yanmar dealer who insisted it was something else. You do have to remove the entire assembly and turn it around to undo the screws that release the cover to the impeller. I do not know the gasket number (anyone else know?). Paul
Take the whole pump off
I have the same issue on my 3GM. 4 hose clamps and the 2 bolts that hold the pump. Takes about 5 minutes. Well worth the time.
I have the same issue on my 3GM. 4 hose clamps and the 2 bolts that hold the pump. Takes about 5 minutes. Well worth the time.
Removing the impeller
Forgot to mention; be REAL CAREFUL taking the cover off. The gasket is very thin and you can tear it. Not to worry if you do however, you can make a new one by tracing the old one onto a piece of card stock paper. The trick is making the screw holes. I find that a leather hole punch is the answer but an exacto knife and a lot of patience will work too.
Forgot to mention; be REAL CAREFUL taking the cover off. The gasket is very thin and you can tear it. Not to worry if you do however, you can make a new one by tracing the old one onto a piece of card stock paper. The trick is making the screw holes. I find that a leather hole punch is the answer but an exacto knife and a lot of patience will work too.
What about
the automtive gasket material (RTV) that you can purchase? Will this work. I am just wondering as I will be replacing mine soon as well.
the automtive gasket material (RTV) that you can purchase? Will this work. I am just wondering as I will be replacing mine soon as well.
Speedseal
Had a similar issue with my westerbeke 30B3. The plate faced aft and was held in place with 5 or 6 small screws. A couple years ago I went with a Speedseal, which makes it possible to change the impeller without even looking at what you're doing. Works great, no tools required. Of course, you must have at least some room for access to the plate, even if you can't see it from the front.
Had a similar issue with my westerbeke 30B3. The plate faced aft and was held in place with 5 or 6 small screws. A couple years ago I went with a Speedseal, which makes it possible to change the impeller without even looking at what you're doing. Works great, no tools required. Of course, you must have at least some room for access to the plate, even if you can't see it from the front.
Water Pump Maintenance
For 20 out of 21 seasons I've just loosened the belt, taken out the mounting bolts; turned the pump sideways with the hoses still attached; removed the screws and cover and pulled the impeller. One year I replaced the lower hose at the same time. I have replaced the screws with allenhead screws, which makes it easier to loosen or tighten them. If the hoses were shorter you might have a problem twisting them.
For 20 out of 21 seasons I've just loosened the belt, taken out the mounting bolts; turned the pump sideways with the hoses still attached; removed the screws and cover and pulled the impeller. One year I replaced the lower hose at the same time. I have replaced the screws with allenhead screws, which makes it easier to loosen or tighten them. If the hoses were shorter you might have a problem twisting them.
Gasket
The gasket, at least on my yanmar, was rubber, not the paper thin version some are referring to here. The paper gasket was part of the other replacement the yanmar dealer was making. Paul
The gasket, at least on my yanmar, was rubber, not the paper thin version some are referring to here. The paper gasket was part of the other replacement the yanmar dealer was making. Paul
Always had a paper gasket too.
Every one of the Yanmar impellers that I have purchased had the thin paper gasket. R/R is actually quite easy, but the SpeedSeal makes that job even easier. This would be especially important if you need to replace one at sea (which is when they usually fail). I also do not remove any hose clamps. Just turn it over once you remove the bolts and remove the screws. Pull the old impeller, grease it up and install the new one. Replace the gasket and reverse the process.
Every one of the Yanmar impellers that I have purchased had the thin paper gasket. R/R is actually quite easy, but the SpeedSeal makes that job even easier. This would be especially important if you need to replace one at sea (which is when they usually fail). I also do not remove any hose clamps. Just turn it over once you remove the bolts and remove the screws. Pull the old impeller, grease it up and install the new one. Replace the gasket and reverse the process.
Caution on my impeller
Given Steve's input, and others, I'd like to caution on my impeller specs - there may be more than one type of fresh water pump attached to a 2GM20F, so proceed with caution. It looks like you need to pull yours to find out what you have. Paul
Given Steve's input, and others, I'd like to caution on my impeller specs - there may be more than one type of fresh water pump attached to a 2GM20F, so proceed with caution. It looks like you need to pull yours to find out what you have. Paul
Keep Gaskets aboard
I usually keep spare gaskets aboard the boat. They are simple paper and can always be re-created as a previous poster mentioned, but they are also inexpensive enough to keep a couple extras aboard (about $.50/ea).
I usually keep spare gaskets aboard the boat. They are simple paper and can always be re-created as a previous poster mentioned, but they are also inexpensive enough to keep a couple extras aboard (about $.50/ea).
I Ise Liquid Soap as a Lubricant
I usually use Dawn (or the like) to lubricate the new inpeller when I insert the new impeller into the housing. You know it is working when the bubbles show up coming out the back with the water. They quickly dissipate.
I usually use Dawn (or the like) to lubricate the new inpeller when I insert the new impeller into the housing. You know it is working when the bubbles show up coming out the back with the water. They quickly dissipate.
I Had Phillips Head Screws...
...and replaced them with nut heads. Whatever you use, don't bear down on them because they are very soft bronze and will strip the head very easily.
...and replaced them with nut heads. Whatever you use, don't bear down on them because they are very soft bronze and will strip the head very easily.
- Status