Run-Dry Impellers
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=35755
Printed Date: May-07-2024 at 10:28pm
Topic: Run-Dry Impellers
Posted By: Jonny Quest
Subject: Run-Dry Impellers
Date Posted: April-12-2015 at 5:33am
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Does anybody have any experience with Globe Marine Products Run-Dry impeller? Per the website: Tests prove that Globe’s Run-Dry® impellers outperform standard neoprene or rubber impellers and are guaranteed to run-dry for up to 15 minutes. I need a spare impeller and I was considering a Run-Dry... JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Replies:
Posted By: 8122pbrainard
Date Posted: April-12-2015 at 8:23am
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Why do you want to run the engine dry? You can try it but I suggest having the OEM impeller on hand. ------------- /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: backfoot100
Date Posted: April-12-2015 at 9:26am
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What do you think will happen in the engine compartment when all that heat being generated has no place to go for 15 minutes? Best case scenario, virtually all the hoses are completely melted. The exhaust manifolds are cracked and useless. I would guess that the block and/or heads are also cracked and there could very well be some fiberglass on the engine cover or the bilge that has started melting. Worst case scenario, a fire sends the boat to the bottom of the lake after the heat buildup ignites something under the engine cover. Just because you have an impeller that can run dry for 15 minutes doesn't mean that anything else in that engine compartment can run dry for 15 minutes. Let us know how that works out for you. ------------- When people run down to the lake to see what's making that noise, you've succeeded. Eddie |
Posted By: 8122pbrainard
Date Posted: April-12-2015 at 9:47am
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Eddie, Well stated. I was going to mention the issues but didn't have the time when I posted. Rob is on a "quest" to see what other damage can be done!!  ------------- /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: Orlando76
Date Posted: April-12-2015 at 10:01am
| There's many times where it'd be convenient to make sure the fuel system is fully primed without having to hook up the hoses and bucket etc. Rolling the engine over for 45 seconds would be nice but don't because of unnescessay stress on impeller. |
Posted By: 8122pbrainard
Date Posted: April-12-2015 at 10:08am
Todd, After a layup, hookup the hose. Then, through the boating season, there should be enough water left in the RWP to lubricate for the 45 second runs without needing to use a questionable "Billy Mays" impeller. Still, I don't like to run a RWP anytime without known lubrication. ------------- /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 < |
Orlando76 wrote:Posted By: Jonny Quest
Date Posted: April-12-2015 at 1:25pm
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Gents: Perhaps you have misinterpreted the purpose of my question. By no means am I advocating that I, or anyone else, should purposely run the raw-water pump dry. However, there are some obvious benefits to have an impeller that is less prone to failure in the event of a problem. I am looking for anyone who has experience with these impellers under normal service. Do they hold-up like the OEM impellers? In the event of a problem, have they performed as advertised? The bottom line is that every time I launch my boat from the trailer, the impeller has to run for a few moments "dry" as it sucks water through the hose, through the strainer, through the transmission cooler and finally into the raw-water pump. I realize that there may be some residual water in the hose, but perhaps this new style impeller is a better way to go in the long run. JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: Gary S
Date Posted: April-12-2015 at 2:02pm
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I had one when they were under the Barco name. I felt it wore faster than a oem. The tips of the vane's and the sides of the impeller were not smooth after it ran for awhile. Back when there were more inboards on the market ie the 80's, they went out of business. If you look at how PCM ran their hoses you can see that there is enough water left in the hoses when shut off to protect the impeller before external water gets to the pump. I feel if these impellers were what they claim to be the OEM' would jump on it. The fact that they have not says something. ------------- 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: Jonny Quest
Date Posted: April-12-2015 at 3:43pm
Thanks, Gary. That's what I was looking for. JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: 8122pbrainard
Date Posted: April-12-2015 at 5:15pm
You answered your own concern. The impeller doesn't run dry due to the residual 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: Gary S
Date Posted: April-12-2015 at 5:37pm
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Rob don't get me wrong it did work and if they were the only thing available I'd use them. It just that the oem Sherwoods are readily available along with the Jabsco's in the Mustang. I have never had one gone bad,some years I don't even remove them. ------------- 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: 8122pbrainard
Date Posted: April-12-2015 at 7:39pm
I've never blown one ether nor do I remove them for layup. This every 2 years is way overkill BS in my mind. These impellers (dual pocket) were still fine after 17 years http://s133.photobucket.com/user/brainard_bucket_bucket/media/DSCF0010-7.jpg.html" rel="nofollow">  I changed them before I took the X55 to GL. Those of you who blow impellers run them dry!!!!!!!  ------------- /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: DrCC
Date Posted: April-12-2015 at 9:35pm
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But Pete, Do you use your boat twice a day, every day during ski season? |
Posted By: 8122pbrainard
Date Posted: April-12-2015 at 9:52pm
Al, The 17 years is roughly 350 hours or 1/2 the average per season of 50 hours. It's still 17 years of impeller blade compression set since as mentioned, I have never removed any impeller for a layup. ------------- /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: Jonny Quest
Date Posted: April-12-2015 at 10:31pm
I've owned my current SNOB for 6 years. The previous owner is a close friend and was the original owner. I purchased the boat from him when he moved away. He told me that he would change out the impeller ever 2 years. He also claimed that the engine was only operated with a water source. I believe him. In the glove box was a "spare" impeller that my friend had saved from the previous change-out. It looked reasonably good, just the normal curved vanes. When I did my first impeller change-out, the impeller was in pretty bad shape. Small chunks of impeller vanes were missing. I couldn't determine if the impeller condition was due to dry running or not. The impeller was only 2 years old, so I'm trying to avoid any similar problems. Can an air-bleed or air leak cause impeller failure? I did discover that the there was a crack in the strainer housing that would have allowed air into the system. That has since been corrected with a new Sherwood strainer. JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |