Water Impeller Replacement
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=22550
Printed Date: November-19-2024 at 10:25pm
Topic: Water Impeller Replacement
Posted By: Metallman56
Subject: Water Impeller Replacement
Date Posted: July-11-2011 at 1:03pm
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i have a '71 martinique with a h.m 302. last time i had it out, it almost overheated. so i started replacing hoses, and sure enough the hose before the water pump was litterally falling apart, and blocking the entrance of the pump. so i got all new water hoses. pump still didnt work. so i took apart the water pump to find my impeller litterally 1/2 the size its suppose to be. so its time to replace that.
so heres the problem. the guy at the marine told me you have to pack it in the pump the way it rotates, or it will burn out first time you fire it. so i got on here and did a search and saw that not only should i have seen which way it came out, but also which side was up on the pump. i of course did neither of these things. my question is, how do i figure this out? is there any easy way of telling which side of the pump is up, and then which way the impeller goes in? i would really hate to piss $35 away over something stupid. any help would be awesome! and sorry about the spelling. thanks |
Replies:
Posted By: Bri892001
Date Posted: July-11-2011 at 1:18pm
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Which way the impeller goes in isn't a major big deal. You'll find the new ones don't have the bent blades. They start out straight and conform to one side. It's good if you can start with them "combed" the right way, but not the end of the world.
It wouldn't be a bad idea to coat it in some kind of lubricant, water based, like Babe's boot butter, or pick your favorite from your local drug store. Which way the pump goes... that's a toughie if you didn't see. Not sure if you could turn it my hand fast enough to figure which way it's pumping. If you run the engine with it facing the wrong way, you could burn your new impeller pretty quick. Hopefully someone else has experience with this. |
Posted By: Metallman56
Date Posted: July-13-2011 at 1:03am
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makes me feel better about the direction not really mattering. i think i have found a way to match the up to up and down to down based on a mixture of paint and rust markings. kinda a sad way to figure it out, but about the only thing i can think of at this point.
if i do put it on upside down, how will i know its wrong? will it sound diffenrt, or . . . . . .? |
Posted By: 8122pbrainard
Date Posted: July-13-2011 at 8:31am
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http://depcopump.com/datasheets/pumpschool/HowFlexImpellerWorks.pdf - How a flex impeller pump works ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Gary S
Date Posted: July-13-2011 at 11:51am
I have not been on because I'm still out of electric-boat is stuck on the lift  If you have the original crank mounted Jabsco, the straignt outlet goes up,the curved one is the inlet which points down------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: ny_nautique
Date Posted: July-13-2011 at 1:56pm
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To piggyback on this thread... I had some overheating issues this weekend (my first time out on the boat since buying it). I removed the Sherwood RWP and the impeller was a mess. Pieces everywhere. I cleaned up the pump and ordered a new impeller (well, 2 actually).
I want to make sure that the PO installed it properly. How can I tell the right way to install the Sherwood? (84 SN 2001; 351) Thanks, Jeff |
Posted By: 8122pbrainard
Date Posted: July-13-2011 at 3:02pm
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Jeff,
Go to the link I provided above. The key to the proper flow direction is the cam inside and the rotation. Maybe the PO had a bad habbit of running the engine without water? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: ny_nautique
Date Posted: July-13-2011 at 3:38pm
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Pete - if I read that right, it's almost like there is no up or down for the RWP itself, it is just that the impeller fingers need to be oriented the right direction. The Sherwood pump seems to be symmetrical, with only the belt determining what is in and what is out. I'm going from memory... it is on my bench at home so I may be incorrect with that.
Theoretically I could run it in my driveway, forcing water into the intake from the hose, and determine the direction that the pulley is spinning. Then take it off and insert the impeller with the fingers pointing the right direction. Agree? |
Posted By: Bri892001
Date Posted: July-13-2011 at 4:29pm
I wouldn't go too crazy worrying about the fingers. It's nice to have them going the right way, but they are not what determines water flow. The problem arrises because CC (and PCM etc.) used the same or similar Sherwood pump regardless of engine rotation. But then, oriented the body of the pump to be appropriate for what rotation the engine is. So, the same pump can be used for either rotation, but you have to orient it correctly for your application. If you lost track of where the set screw (used for reference) was pointing, then the best thing is to use Pete's reference link. |
ny_nautique wrote:Posted By: 8122pbrainard
Date Posted: July-13-2011 at 5:04pm
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Jeff,
The picture can be confusing so take another look at it. Brian above hit it - if you flip the pump, it puts the cam on the other side requiring the opposite rotation. Put it all back together, stick the suction side hose in a bucket of water, start the engine and see if it pumps. If not, flip it. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Metallman56
Date Posted: July-13-2011 at 5:43pm
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thanks everyone for the help. i just got it all back together and it seems to be working fine.
thankfully when i pulled it i left a hose on the suction end. once i realized that it was just a matter of seeing which way the belt turned (counter clock wise) and the rest was just getting it back together. my original impeller was so jacked i could hook a hose up to the motor, turn on the hose, and water would come out of the exhaust. when i replaced it, i turned on the hose, and kept blowing a water line off. i couldnt figure out way and was starting to get p*ssed till i realized with out the impeller spinning, no water would go anywhere. so i started the motor, then turned on the hose, and it seems to be working great. i'll be doing the bucket test to confirm but so far so awesome. 
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Posted By: Metallman56
Date Posted: July-13-2011 at 5:47pm
| LOL sorry about last post, i had no clue the pic would be so big. good lord! |
Posted By: 8122pbrainard
Date Posted: July-13-2011 at 5:51pm
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Not given,
That impeller is one of the worst I've ever seen!!  Someone's been running the engine without water!  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: ny_nautique
Date Posted: July-13-2011 at 5:52pm
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Glad you got yours taken care of Metalman. And thanks for letting me hijack :)
I get it Pete and Brian. The set screw is the screw that holds the cam in place. Your pic looks familiar! 
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Posted By: 8122pbrainard
Date Posted: July-13-2011 at 8:31pm
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not given (Metallman56),
Fill in your profile if you care to. You may have not noticed but here, on CCfan unlike other sites, we have a tendency to go by actual names and not screen names. Maybe it's because we're just "old fashioned" (I'm one of them!! ) but it's just more personal! I never like to call one of our new members "not given" but I do it to see if they will fill in the blanks/profile info. Pictures are always a big plus as well as an addition of your boat/history to the diaries section.
Welcome to CCfan - It's the best!!!  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Metallman56
Date Posted: July-13-2011 at 9:49pm
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Thanks again to all that helped! took the boat out today for about 2 hours ran great and didnt get over 100 degrees! so yeah its cooling a lot better, lol.
before when i took it out the temp gauge stayed around 160 pretty much all the time. i would not have noticed it, if it had not been for the 4th of july when i was running at idle. i could smell hot motor and knew there way a big problem. got it cooled down to 160 before i even atempted to start it. once i did i ran it at 3500 rpms for about 3 miles back to the boat launch. as soon as i backed it down to get close to the pier i could see the gauge climbing. a very scary thing. but its working great now, and i couldnt be more thankful...... i didnt even know i had to replace an impeller every year or two, and i've had the boat for about 7 years now. whoooops, lol. as for my name, its jim. if you have heard of rleinen79 thats actually my older brother. i'll update my profile for you guys though. thanks for the warm welcome 
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Posted By: Tim D
Date Posted: July-13-2011 at 9:54pm
Here's part of the seal kit. The other part is the white ceramic piece inside the pump.
Old impeller, before removal. It helps to put the impeller in off a couple of clicks from the woodruf key and rotate to bend the blades then push on the shaft.  ------------- Tim D |
Posted By: 8122pbrainard
Date Posted: July-14-2011 at 8:52am
Jim, Every couple of years on an impeller may be good preventative maintenance but it's overkill on the predictive. The key is not running them witout water. Even that "lets see if it starts at the ramp before we drop it in" hurts. Have you been running it without water? So, Rob is your brother! Great to hear. What about GL? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Metallman56
Date Posted: July-16-2011 at 12:12pm
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rob has always told me that running it out of water is "the worst thing you can do to it" but he never told me why. to be honest i doubt he knew or knows. and i have always ignored him because well, its just an engine. and just like any engine you can run it without water, just dont let it get hot. i never knew about the impeller, well until i saw what was left of mine lol.
green lake definatly doesnt sound like something i would enjoy. every year rob comes home and says how cool it was and seeing all the boats was really neat. and that lasts for about a month. and then the truth starts coming out little by little. its a huge lake, its pretty much always rough and choppy, and that doesnt exactly sound like fun to me. especially sense its a 5 or 6 hour drive, through chicago, and in my v10 dodge ram that gets 8.4 mpg when pulling the boat. dont get me wrong i would love to see all the boats and think it would be really cool, its just rough water and $4 a gallon gas prices, makes it something i would rather not experiance. i have tagged along with rob to clinton, which is the lake in the middle or illinios with the nuke power plant. i met alan (no idea the screen name, pulls boat with motor home)and a few others. so something thats a little closer, and on a lake i thats nice enough to ski on, i'm all for. |
Posted By: eric lavine
Date Posted: July-16-2011 at 1:03pm
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you will remember this forever, a dry run on a rubber will cause friction burns ------------- "the things you own will start to own you" |
Posted By: MartyMabe
Date Posted: July-16-2011 at 1:11pm
------------- 66 Skylark http://www.correctcraftfan.com/diaries/details.asp?ID=5041" rel="nofollow - 93 SN If you're not living in NC, you're just camping out! |
Posted By: Metallman56
Date Posted: July-17-2011 at 12:39pm
guess i learned that the hard way.
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