YANMAR fresh water pump???????????

[woodster]

i have a 2gm20f yanmar engine new to me but needs some work.....i need to rebuild the fresh water circulating pump....has anyone done this before and if so does the bearing shaft thread to the metal impeller or press fit to it ...and also after taking off the pully hub with the four bolts in it with a puller ...does the shaft press out to the rear of the pump or press out to the front of the pump... i am trying to do this in order the save the pump as opposed to buying a new one.......havent had much luck in finding a used one at this time......

all comments and input are welcome.......

thanks in advance

regards

woody

 

[woodster]

Once you remove the pulley, there is a circlip, a bearing, and another circlip. Pull off the 2 circlips and bearing the the shaft should pull out the front of the pump. See diagram at:

http://www.huntertwentyeightfive.com/Salt_water_pump.html

thanks Warren..... that is a good diagram of the sea water pump ...only thing is i am working on the fresh water pump for the heat exchanger and engine cooling water ....i have a closed cooling water system......

regards

woody

 

[Ted]

Yanmar fresh water pump

Woodster, you're not going to like this reply. In the Yanmar service manual section 15-5 it states the following:

" Pump disassembly of the fresh water pump is difficult and should not be attempted. Faulty units should be replaced. The pump assembly should not be disassembled from the pump body brackets, unless absolutely necessary."

The shaft and bearing are one unit and cannot be disassembled. It looks like it's a pressed fit to the pump housing and probably comes out in the direction of the pulley. I'm not positive about that but the drawing does not give any indication otherwise.

 

[njsail]

I tried to fix a leaking 1985 Yanmar 2GM20F water pump a number of years ago. here is the photo set.

http://ipphotos.com/view_ad.asp?Ad_ID=586

I tried everything to get the shaft separated from the bearing with no luck. The shaft was scored so I just replaced the whole pump. I was happy with the choice after I spent the money. The pump was leaking at the shaft seal and that was the begging of the end.
Good luck

 

[woodster]

Woodster, you're not going to like this reply. In the Yanmar service manual section 15-5 it states the following:

" Pump disassembly of the fresh water pump is difficult and should not be attempted. Faulty units should be replaced. The pump assembly should not be disassembled from the pump body brackets, unless absolutely necessary."

The shaft and bearing are one unit and cannot be disassembled. It looks like it's a pressed fit to the pump housing and probably comes out in the direction of the pulley. I'm not positive about that but the drawing does not give any indication otherwise.

thanks Ted.....that is good information and it helps me a lot with how to proceed and how stuborn :bang: i want to be...the way i look at it right now the pump is of no service to me ...so i am going to try and see if it is rebuildable ...and if not i am going to try and find a used one in good repair.....before i bite the bullet and buy a new one......someone once told me sailors were tight.....and now i can see why they are.....this boating thing in this day and time seems to cost more than raceing did when i was younger....

regards

woody

 

[Ted]

Woody, let us know how it works out for you. I'm wondering if individual replacement parts are available being that Yanmar doesn't recommend disassembly of the fresh water pump. With the high cost of new (complete) pumps, I would definitely do the same as you. Nothing ventured nothing gained. Good luck.

 

[woodster]

Woody, let us know how it works out for you. I'm wondering if individual replacement parts are available being that Yanmar doesn't recommend disassembly of the fresh water pump. With the high cost of new (complete) pumps, I would definitely do the same as you. Nothing ventured nothing gained. Good luck.

Ted....... the pump is made by a company called AISIN for Yanmar and they also make auto water pumps as well....so i am sure if i dont trash the pump on disassembly i can rebuild it .....i have seen a lot of pumps for autos and they all have an after market rebuilder some where or another ...so me being armed with that knowlledge makes me determined to tackel this project.........

regards

woody

 

[Maine Sail]

Ted....... the pump is made by a company called AISIN for Yanmar and they also make auto water pumps as well....so i am sure if i dont trash the pump on disassembly i can rebuild it .....i have seen a lot of pumps for autos and they all have an after market rebuilder some where or another ...so me being armed with that knowlledge makes me determined to tackel this project.........

regards

woody

Many of the Japanese pumps are made by AISIN. The pump on my Mitsubishi/Westerbeke is an AISIN. I was able, after many hours of net searching, to find out what the actual Mitsubishi model # of my engine is. With this info I was able to track down and industrial Mitsubishi engine distributor and order a parts catalog specific to my Mitsubishi block. The pump for my engine is about $129.00 non-marine and $380.00 from Westerbeke. I don't think I could buy the parts to re-build it for $129.00, even if they sold them to the general public, which they don't.

Older Yanmar base engines are used on tractors, skid steers and many other non-marine applications so you may be able to pull an AISIN # off it and track one down. These days the marine Yanmars are farily marine specific, but for an older one, you may be able to find the pump you want for less than "marine" prices..

What model year is your engine?

Here's a site with some Yanmar pumps for about $50.00. You'll have to do the research to find out which one may fit...

http://www.thermoenginesupply.com/pumps.asp


Also try Depco Pump in Florida..

 

[woodster]

Many of the Japanese pumps are made by AISIN. The pump on my Mitsubishi/Westerbeke is an AISIN. I was able, after many hours of net searching, to find out what the actual Mitsubishi model # of my engine is. With this info I was able to track down and industrial Mitsubishi engine distributor and order a parts catalog specific to my Mitsubishi block. The pump for my engine is about $129.00 non-marine and $380.00 from Westerbeke. I don't think I could buy the parts to re-build it for $129.00, even if they sold them to the general public, which they don't.

Older Yanmar base engines are used on tractors, skid steers and many other non-marine applications so you may be able to pull an AISIN # off it and track one down. These days the marine Yanmars are farily marine specific, but for an older one, you may be able to find the pump you want for less than "marine" prices..

What model year is your engine?

Here's a site with some Yanmar pumps for about $50.00. You'll have to do the research to find out which one may fit...

http://www.thermoenginesupply.com/pumps.asp

its a 2gm20f.......around 1982 to 1984

thanks for the lead i will check it out and let you all know how it goes...

regards

woody

 

[RichH]

Most Yanmar FW pumps are all press-fit assemblies.

Sequence:
1. Remove the V pulley
2. Use a puller on the front flange to remove (press fit to the shaft)
3. Remove the 'body bracket' .... the casting that goes between the pump and engine block --- to expose the impeller
4. Use a puller and remove the impeller (press fit to the shaft)
5. Remove the mechanical seal 'under' the impeller - get a new one
6. Press out the shaft .... press out the shaft TOWARDS the pulley side of the housing. The bearing assembly will come out with the shaft. Then you can press off the bearing assembly from the shaft.

Note1 - when reinstalling impeller - there needs to be an 0.020" clearance between the 'front face of the vanes of the impeller (at oblique angle) and the pump body AND you need 0.020" between the rear face of the impeller and the pump bracket that fits to the engine casting - use a straight edge across the pump body housing and use the gage between the straight edge and the pump bracket. .... BTW - MAX. clearance of both these areas is 0.040 max. clearance.
Note2 - if the impeller seal 'seat' on the front of the impeller has become roughened ... replace impeller as the seal needs a perfect smooth seat to seal ... otherwise leakage.

Seals and gaskets are relatively cheap; the bearing assy. is a bit pricey but MUCH MUCH less than a new pump. If you dont have the 'expertise' to press fit to the above tolerances, NEGOTIATE with your engine shop to do the pressing/rebuild for you - also MUCH cheaper than a 'new' pump.

 

[woodster]

Most Yanmar FW pumps are all press-fit assemblies.

Sequence:
1. Remove the V pulley
2. Use a puller on the front flange to remove (press fit to the shaft)
3. Remove the 'body bracket' .... the casting that goes between the pump and engine block --- to expose the impeller
4. Use a puller and remove the impeller (press fit to the shaft)
5. Remove the mechanical seal 'under' the impeller - get a new one
6. Press out the shaft .... press out the shaft TOWARDS the pulley side of the housing. The bearing assembly will come out with the shaft. Then you can press off the bearing assembly from the shaft.

Note1 - when reinstalling impeller - there needs to be an 0.020" clearance between the 'front face of the vanes of the impeller (at oblique angle) and the pump body AND you need 0.020" between the rear face of the impeller and the pump bracket that fits to the engine casting - use a straight edge across the pump body housing and use the gage between the straight edge and the pump bracket. .... BTW - MAX. clearance of both these areas is 0.040 max. clearance.
Note2 - if the impeller seal 'seat' on the front of the impeller has become roughened ... replace impeller as the seal needs a perfect smooth seat to seal ... otherwise leakage.

Seals and gaskets are relatively cheap; the bearing assy. is a bit pricey but MUCH MUCH less than a new pump. If you dont have the 'expertise' to press fit to the above tolerances, NEGOTIATE with your engine shop to do the pressing/rebuild for you - also MUCH cheaper than a 'new' pump.

thanks Rich H that is exactly what i have been looking for in the way of info i have been looking for and is just about what i felt like the process would involve...but not haveing ever done one of theses pumps i was concerned .........

as useal every one has been a great help and i want to think you all for taking the time to point me in the right direction ......

regards

woody

 

[RichH]

Woodster ....
Obtain the 'shop manual' for your engine model - "Yanmar Service Manual". Can be obtained from various internet 'manual suppliers/outlets' in either digital or 'hard copy' format or directly from your Yanmar dealer. Such manuals are very precise and will save you LOTS of $$$$.

Ditto ... the same with your automobiles, outboards, trucks, etc. Avoid the 'general' types of manuals produced by "Clymer, Haynes, etc." but 'ok' if you cant get the OEM manual.

 

[eldercaddy]

Hi woodster. When I used the 2gm20f yanmar engine, at first it doesn't work but after some fiddling, the water circulates very well and it is very clean.

 

[woodster]

Up Date on yanmar fresh water pump rebuild

ok after a long search i found the parts from a water pump rebuilder on the west coast...... total cost of parts was $45.00 and shipping....after talking to the man..... he said he would rebuild it for $75.00.......i can do this work but decide to just send the pump to him and let him do it as he does this day in and day out ...and i needed to treet myself to a christmas present any way lol ....so the pump is in the mail lol ...we confermed that the parts he had were the ones i needed on the phone....so i am happy to report that i am haveing it built for the price of the parts.... had i ordered them from yanmar.......man ya just gotta love the internet and stoborne old farts like me lol ...thanks to everyone who shared advice on this subject...and....." Happy New Year!!!!!!"

regards

woody

 

[jdeatsch]

Uh,
Woodster,

Who's the guy on the west coast? Someone else is likely to need his name or such.

jannow?

Thanks,

Jim