Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-17-2012, 10:42 PM   #1
Guru
 
Scary's Avatar
 
City: Walnut Grove Ca
Vessel Name: Cary'D Away
Vessel Model: Hatteras 48 LRC
Join Date: Apr 2012
Posts: 887
Water Pump Impellers

My Detroit's use Johnson water pumps. On this last outing I replaced my third impeller on my starboard engine in two years. That makes four impellers for the two engines in two years plus one for my Northern Lights generator. Replacement Jabsco impellers all except the Northern Lights which is a Northern Lights replacement part. Since this is the first impeller for the Northern lights in two years and the first I've installed I don't know the history of the old impeller. However I think I'm burning through the Jabsco impellers at a alarming rate. I'm using Jabsco as replacement as they are easy to come by. Has anybody got a better type or brand of impeller. I understand there are impellers made from a better rubber, has anybody had any experience finding better impellers?
__________________
Advertisement

Scary is offline   Reply With Quote
Old 07-17-2012, 10:57 PM   #2
Scraping Paint
 
City: -
Join Date: Oct 2007
Posts: 13,745
We have Johnson pumps on our two FL120s and our first impeller change was five years or so after the pumps were installed. The impellers that came out looked exactly like the new impellers going in. On the advice of our diesel shop we use Johnson-branded impellers. Don't know who actually makes them--- maybe Johnson does--- but we were told they are better quality and last longer than the typical Jabsco impeller.

However, our Onan Jurrasic Edition MDJE 7.5kw generator has a Jabsco raw water pump on it and it's been at least seven or eight years since I've changed it. We use a Jabsco impeller for that application. It's on the to-do list but I never seen to get around to it. We don't use the generator a lot on cruises--- once a day on days we don't run the main engines and only for an hour or so to throw a charge into the batteries and heat water for the day. But so far the water volume and velocity out the generator is exhaust is unchanged so the Jabsco impeller has given us good service. But I do need to change it........
__________________

Marin is offline   Reply With Quote
Old 07-18-2012, 05:07 AM   #3
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 21,959
I understand there are impellers made from a better rubber, has anybody had any experience finding better impellers?

Impeller life varies with the silt/sand content of the water.

A better filter setup might give a couple of hundred hours longer , but the "fines" are hard to catch.

FF
FF is offline   Reply With Quote
Old 07-18-2012, 06:00 AM   #4
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 23,698
The Jabscos in my Cat 3208s were flawless afer 3 year cycles. 9 months of use, then 3 months out for winterization. Widely used around here without complaint (that I've heard of).

Even had one on my assistance towing boat where sand wore a hole through the pump case before the impeller failed.

What is the type of failure on the Jabsco impellers??? Maybe it's not the impellers.
psneeld is offline   Reply With Quote
Old 07-18-2012, 07:32 AM   #5
Guru
 
City: North Charleston, SC
Join Date: Sep 2010
Posts: 4,408
Quote:
Originally Posted by Scary View Post
....... However I think I'm burning through the Jabsco impellers at a alarming rate. I'm using Jabsco as replacement as they are easy to come by. Has anybody got a better type or brand of impeller. I understand there are impellers made from a better rubber, has anybody had any experience finding better impellers?
A friend of mine has a Mercruiser gas engine and he was having problems with impeller life. Together, we noticed that there was a piece broken out of the pump housing and the rough edge was chewing the impellers.

A new pump housing solved the problem. Just something you might want to check.
rwidman is offline   Reply With Quote
Old 07-18-2012, 09:32 AM   #6
Guru
 
Scary's Avatar
 
City: Walnut Grove Ca
Vessel Name: Cary'D Away
Vessel Model: Hatteras 48 LRC
Join Date: Apr 2012
Posts: 887
Pump housing feels ok

Maybe these impellers had hardened while in storage. But the vanes were broken off at the hub. All but one of these impellers came with the boat so I'm not certain of their age. I'm going to Oakland today so I will buy spares. I'm going to try to find Johnson impellers if possible. But I think I should be getting at least three of four hundred hours out of impellers. I have about a thousand hours on the Northern lights and this is my first replacement impeller I've installed however I've only put a couple of hundred hours on it since I bought the boat so I don't know the replacement history. On my Cummins 330B's with Johnson pumps I could get about 600 hrs or more.
Scary is offline   Reply With Quote
Old 07-18-2012, 01:06 PM   #7
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 23,698
can't go by hours necessarily...broken off vanes to me signals they sat awhile and the inside of the pump was dry started.
psneeld is offline   Reply With Quote
Old 07-18-2012, 10:25 PM   #8
Guru
 
HopCar's Avatar
 
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 4,865
Impeller blades that break off near the hub are an indication of dry running. At a normal end of life the blades will start to crack about half way up the blade, not near the hub. If it has been run really dry the ends of the impeller will be hard and polished or cracked. Jabsco makes very high quality impellers. My guess is that you either have a restriction in the intake side of the pumps or the wrong impeller is being used.
If you can tell me the Johnson impeller number, I can tell you the Jabsco number that replaces it. At least we can confirm that you are using the correct impeller.
HopCar is online now   Reply With Quote
Old 01-30-2019, 07:12 AM   #9
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Join Date: Oct 2007
Posts: 15,575
Greetings,
Old thread but I've searched and no joy...Can anyone provide part #'s for impellers for the 120 Lehman replacement water pump (Johnson) please? Johnson and Jabsco numbers would be appreciated. I understand, from AD that they are both the same impellers. Thanks in advance.
__________________
RTF
RT Firefly is online now   Reply With Quote
Old 01-30-2019, 07:46 AM   #10
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 23,698
for the new water pumps.... 1"


Johnson F7 series 09-1028BT-1



This was shipped by Am. Diesel and was a SPX brand impeller.
Attached Thumbnails
impeller.jpg  
psneeld is offline   Reply With Quote
Old 01-30-2019, 08:39 AM   #11
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Join Date: Jan 2013
Posts: 6,543
I would get Johnson impellers, not Jabsco. Jabsco seems to be descending rapidly down the drain. I eliminated all their products from our build. ITT, now renamed Xylem, bought Rule many years ago and ruined them. Another product I'll never buy again. Then they bought Jabsco and the trend appears to be the same, i.e. down the drain.
__________________
MVTanglewood.com
twistedtree is offline   Reply With Quote
Old 01-30-2019, 08:45 AM   #12
Guru
 
Lepke's Avatar
 
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,337
I have DD 671s and get at least 5 years and 100s of hours out of my impellers. When I do change them, they're still serviceable. If you see an old DD manual the instructions are to grease the inside housing and end plate with waterproof grease. I've been doing it this way since the 1960s and never have a failure in DDs or other engines. I usually check my impellers once or twice a year and regrease.
The grease improves the seal between the impeller and the housing and makes for better suction on the first start and lubes the impeller until there's water in the system. Without lube, the impeller tips get hot and that makes them hard and prone to break off.
I don't buy any particular brand of impeller, just whatever is cheapest. Spare impellers will go bad exposed to heat and air so I vacuum seal my spares and keep a couple old ones, too.
__________________

Lepke is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 12:02 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×