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I ordered the Hardin gen 4 and it really wasn't much more than I'd I bought the Merc. I didn't want to pay fifty bucks for the fittings and I'm a machinist so I bought a 4in stainless nipple for six bucks and cut it in half. I'll turn some barbs / grooves on them but it won't be much. I also bought a merc bracket but it's really close to my fuel pump so I bought a new pump that I can clock out of the way for forty bucks. I also didn't want to pay what they wanted for their pulley so I'm using an arbor and pulley for a regular Chevy waterpump.
I sure am glad I went with the Hardin pump, it looks fantastic and I'm glad to hear you guys are getting multiple years out of them. I'll check mine after this season and see how it looks, probably run it two years. https://cimg2.ibsrv.net/gimg/www.off...217dcc6507.jpg |
I rebuilt mine with a factory rebuild kit with new wear plates and it seems to have resolved my pressure and priming issues. I don't know why reversing the wear plates didn't work. I had the boat out earlier this month before our governor banned powerboating.
https://cimg2.ibsrv.net/gimg/www.off...3e16eeaac4.jpg |
When pressing the arbor on you will need to have the pump apart so the back end of the shaft is not able to push in and damage the bearing. I know some OSO members have had this issue bite them in the past. You made a great choice with that pump. Happy boating.
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Originally Posted by ph1971
(Post 4735185)
When pressing the arbor on you will need to have the pump apart so the back end of the shaft is not able to push in and damage the bearing. I know some OSO members have had this issue bite them in the past. You made a great choice with that pump. Happy boating.
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It's time to share my story with this Hardin sea pump. I recommended these pumps for years but no longer can. I first bought one in 2010 to replace the cracked plastic pump on my 525 (pic in post 62). The only problem was that the threads of the hose fittings do not match those in the pump housing. With the fittings screwed all the way in they are still loose and wobble. Instructions say do not use teflon tape but only pipe thread sealant. I had to use a generous amount of 4200 sealant and allow it to cure first to get them to seal. I had no problems for nine years with just impeller changes every one or two years. Last season water pressure was way down and pump often would not prime until I moved the boat forward to ram water into it. Then it would be OK for the day but pressure was still down. I rebuilt the pump and reversed wear plates but had same problems. This spring I rebuilt the pump with new wear plates, impeller and o-rings. The first 3 times out this spring all seemed good. The fourth time the pump would not pump at all even with forward boat momentum. I bought a brand new pump and put it on yesterday. The new pump has several changes including a new style, solid inner wear plate, no more drain hole and plug and a thicker large o-ring. The new pump also came with allen head bolts for some crazy reason and I cannot use them since I can barely get a 1/2 inch wrench on the 3 inner attaching bolts and there is no way to fit an allen head socket in there. I assembled the pump and installed with the standard head bolts that came with the first kit. I followed the instructions and only used pipe dope on the fitting threads and it sat overnight. Today the pump primed and water pressure seems normal but the fittings are leaking like crazy and now I need to crawl back in there and I will seal them with teflon tape plus 4200 sealant. On the 525 set-up there is nothing to press together as it is a different setup and the pump attaches to the back of the mechanical fuel pump. While my experience hasn't been horrible I am still disappointed in the quality of this pump.
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Originally Posted by thirdchildhood
(Post 4740104)
It's time to share my story with this Hardin sea pump. I recommended these pumps for years but no longer can. I first bought one in 2010 to replace the cracked plastic pump on my 525 (pic in post 62). The only problem was that the threads of the hose fittings do not match those in the pump housing. With the fittings screwed all the way in they are still loose and wobble. Instructions say do not use teflon tape but only pipe thread sealant. I had to use a generous amount of 4200 sealant and allow it to cure first to get them to seal. I had no problems for nine years with just impeller changes every one or two years. Last season water pressure was way down and pump often would not prime until I moved the boat forward to ram water into it. Then it would be OK for the day but pressure was still down. I rebuilt the pump and reversed wear plates but had same problems. This spring I rebuilt the pump with new wear plates, impeller and o-rings. The first 3 times out this spring all seemed good. The fourth time the pump would not pump at all even with forward boat momentum. I bought a brand new pump and put it on yesterday. The new pump has several changes including a new style, solid inner wear plate, no more drain hole and plug and a thicker large o-ring. The new pump also came with allen head bolts for some crazy reason and I cannot use them since I can barely get a 1/2 inch wrench on the 3 inner attaching bolts and there is no way to fit an allen head socket in there. I assembled the pump and installed with the standard head bolts that came with the first kit. I followed the instructions and only used pipe dope on the fitting threads and it sat overnight. Today the pump primed and water pressure seems normal but the fittings are leaking like crazy and now I need to crawl back in there and I will seal them with teflon tape plus 4200 sealant. On the 525 set-up there is nothing to press together as it is a different setup and the pump attaches to the back of the mechanical fuel pump. While my experience hasn't been horrible I am still disappointed in the quality of this pump.
A few questions (trying to help): are you sure the fittings you are using are npt? Seems like the straight fitting is bottomed out which is not normal. Both of your pumps have loose fittings. Do you have any other known npt fittings you could install to see if that's the problem? |
My fittings only thread half way before they are tight. Leaks are so frustrating, I know your pain but mine have always been oil.
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Originally Posted by underpsi68
(Post 4740120)
Sorry for your troubles.
A few questions (trying to help): are you sure the fittings you are using are npt? Seems like the straight fitting is bottomed out which is not normal. Both of your pumps have loose fittings. Do you have any other known npt fittings you could install to see if that's the problem? |
Either the fittings, pump or both were not machined right. I wouldn't run it with 5200 to stop the leak. I would go to Home Depot, Lowes or local hardware store and pickup a male and female 1"npt fitting and see which one, (or both) was not machined right. The fittings should go about half way in before it gets pretty tight. Probably 1/4 to 1/2 the threads will still be exposed.
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That's good advice, it's what I was going to say. Sounds like the fittings are not pipe threads. Pipe threads (npt) get tighter / are tapered straight threads will go in but they won't get tight.
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