Murph_13
Active Member
Nice pictures, good info on that Foster...I struggled to figure out how to attach photos and I'm definitely an amatuer there...
I agree that the wear rings don't look too bad, the one shows some marks, but like Foster said, I've seen worse that still perform okay. The impellers and stators/pump housings look to be in good shape. I'd get a hook-end razor blade for your razor knife and cut the weeds out that are wrapped around the driveshafts where they go into the impellers (be careful of the rubber cone between the driveshaft and impeller).
Is that a stick in the one picture? Whatever that is, that's your biggest problem right now.
You want a pure stream of water running through the pumps, the more air you introduce into that stream, the more detrimental to your performance, which will become more noticeable as the load on the engines increase (for a given performance level, adding more weight creates more load for the engines to produce at that same level, this is what you're seeing when you have another adult in the boat with you). Think of it like a manual transmission vehicle, the jet pump is your clutch. Introducing air into the jet stream of water is like a slipping clutch in a vehicle. When you drive a vehicle with a bad clutch, the more you lean into it, the more it slips. You've got a "bad clutch" right now.
All-in-all, I'd say you did pretty good based on having run them at 6000 RPM/10 mph for 10 minutes. You should check the clearance between the edges of the impellers and wear rings like Seadoobuddy suggested (the black plastic wear ring gets pressed into your pump housing, the impeller rides inside of it).
Good luck with it, it's a good learning experience. I would recommed doing as much work on your boat as you can, like the others have said, there are a lot of knowledgeable people on hear that are happy to help out.
I agree that the wear rings don't look too bad, the one shows some marks, but like Foster said, I've seen worse that still perform okay. The impellers and stators/pump housings look to be in good shape. I'd get a hook-end razor blade for your razor knife and cut the weeds out that are wrapped around the driveshafts where they go into the impellers (be careful of the rubber cone between the driveshaft and impeller).
Is that a stick in the one picture? Whatever that is, that's your biggest problem right now.
You want a pure stream of water running through the pumps, the more air you introduce into that stream, the more detrimental to your performance, which will become more noticeable as the load on the engines increase (for a given performance level, adding more weight creates more load for the engines to produce at that same level, this is what you're seeing when you have another adult in the boat with you). Think of it like a manual transmission vehicle, the jet pump is your clutch. Introducing air into the jet stream of water is like a slipping clutch in a vehicle. When you drive a vehicle with a bad clutch, the more you lean into it, the more it slips. You've got a "bad clutch" right now.
All-in-all, I'd say you did pretty good based on having run them at 6000 RPM/10 mph for 10 minutes. You should check the clearance between the edges of the impellers and wear rings like Seadoobuddy suggested (the black plastic wear ring gets pressed into your pump housing, the impeller rides inside of it).
Good luck with it, it's a good learning experience. I would recommed doing as much work on your boat as you can, like the others have said, there are a lot of knowledgeable people on hear that are happy to help out.
