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Post by Juan on Jun 28, 2015 13:07:54 GMT -6
Well, I changed my water pump today, replaced it all and not just the water pump impeller while I had it apart; It was working fine but since it was going on 10 years old, I was getting worried and thought I should change it to be on the safe side... The entire job took maybe 3 hours... 2 1/2 hours to get the darn key way out and 1/2 hour to remove, replace and reassemble everything else.. (I ended up cutting the key way out with a dremmel tool )  Anyway, except for the normal reshaping of the impeller, it was fine even being almost 10 years old... They are made to last these days... I'll wait 12 year before I replace this one !!   |
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Post by gnrphil on Jun 28, 2015 13:26:37 GMT -6
Good choice on replacing it all, not like me trying to be cheap LOL
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Post by gtightline on Jun 28, 2015 13:31:09 GMT -6
I'm sure there had to be some wear on the base plate and the housing.if it is left without changing the new impeller will be chewed up prematurely, as I'm sure you know. They say it should be changed every season or two...sometimes I wonder if they just say that in order to sell parts..Ten years, well, you can't say you didn't get your moneys worth out of that..hahaha
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Post by Juan on Jun 28, 2015 14:08:47 GMT -6
I'm sure there had to be some wear after all that time, but I looked for it and couldn't see it if there was... I honestly believe that there's no need to replace your water pump every two or three years unless you damage it in some way... (running without a water source or in sand or dirt for very long). I don't believe age causes a water pump to wear out. If this new pump is working better than the old one did, I can't tell any difference but at least I know it's new and should be good for at least another 10 years.  |
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Post by gnrphil on Jun 28, 2015 14:18:17 GMT -6
You can't beat peace of mind, I'm sure I damaged mine running it on muffs as it wouldn't pee doing that. Lesson learned.
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Post by freezerfiller on Jun 28, 2015 20:46:26 GMT -6
What a coincidence! I replaced mine today as well. It looked good, but was full of sand and had some scratches on the housing.
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Post by seagristle on Jun 29, 2015 11:15:47 GMT -6
Wow. 10 years? I change mine every 2 depending on how much I use the boat. The problem (as was described to me by a mechanic) is the impeller deforms and does not pump with adequate pressure. Even tho you can see the tell tale, your top cylinder might not be getting cooled enough.
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Post by Juan on Jun 29, 2015 14:47:44 GMT -6
Wow. 10 years? I change mine every 2 depending on how much I use the boat. The problem (as was described to me by a mechanic) is the impeller deforms and does not pump with adequate pressure. Even tho you can see the tell tale, your top cylinder might not be getting cooled enough. That may be true... the impeller does take on a permanent "bent" shape after sitting in the housing for a long period..I couldn't tell a bit a difference coming from the tell tale but I'm sure if I had a pressure gauge, I would have seen a change in pressure. |
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985crabs
Captain
2000 V1900 Bay Series, Yamaha 150 Carb. 2
Posts: 1,309
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Post by 985crabs on Jun 30, 2015 6:55:08 GMT -6
Wow. 10 years? I change mine every 2 depending on how much I use the boat. The problem (as was described to me by a mechanic) is the impeller deforms and does not pump with adequate pressure. Even tho you can see the tell tale, your top cylinder might not be getting cooled enough. Does anyone know where a pressure gauge measures the water pressure? I changed my impeller and cup, etc. a couple months back and I'd say my pisser shoots a stream anyone would be proud of. In the process I pulled the tube out of the backside of the outlet and found a piece of crud (perhaps old impeller) partially blocking the hole. With that gone, my water pressure at cruising speed (30-35 mph)has dropped from 15-16 psi to 10-12 psi. All the while the pisser is pissing a potful, but I'd hate to think that my top cylinder is getting hot because my pressure is low. What is adequate pressure? Crabs |
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Post by Juan on Jun 30, 2015 11:20:22 GMT -6
Wow. 10 years? I change mine every 2 depending on how much I use the boat. The problem (as was described to me by a mechanic) is the impeller deforms and does not pump with adequate pressure. Even tho you can see the tell tale, your top cylinder might not be getting cooled enough. Does anyone know where a pressure gauge measures the water pressure? I changed my impeller and cup, etc. a couple months back and I'd say my pisser shoots a stream anyone would be proud of. In the process I pulled the tube out of the backside of the outlet and found a piece of crud (perhaps old impeller) partially blocking the hole. With that gone, my water pressure at cruising speed (30-35 mph)has dropped from 15-16 psi to 10-12 psi. All the while the pisser is pissing a potful, but I'd hate to think that my top cylinder is getting hot because my pressure is low. What is adequate pressure? Crabs Crabs, this is from the Yamaha site: All Yamaha outboards have a minimum water pressure of eleven (11) psi at Wide Open Throttle (WOT). There are no announced water pressure specs for low or mid-range operation at this time. This is due to our high volume low pressure cooling system design. In fact, you may see zero pressure at idle, as most water pressure sensors start working at 3-psi. My F150 doesn't have a pressure gauge but I put one on my last 250 2 stroke.. it went connected on the top of the power head and read the pressure from there. Like you and most, I use a visual check and temperature of the water exiting my "pisser" to determine that the water pump is working properly and at the right temp. |
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985crabs
Captain
2000 V1900 Bay Series, Yamaha 150 Carb. 2
Posts: 1,309
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Post by 985crabs on Jun 30, 2015 11:51:43 GMT -6
Thx. Juan, that gives me some reassurance. 'Cross, I don't know what pisser properties are particularly poignant (alliteration). When I warm up on the ears for 5 minutes before I go out my pee stream is uncomfortably warm. When I'm on the water I can come off plane after a 30-minute run at 4500 rpms and the pee stream is no different than the ambient water temperature. Like you said, put gas in it and go. As long as there's water coming out what could be wrong?
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