Empathy List Archives

SW

Sean Welsh

Sat, Mar 26, 2016 10:04 PM

Folks,

I need your best advice on how to remove a recalcitrant impeller. It's
about 2" diameter and 4" long and is the type with two flats on the
shaft rather than splines. It would appear the collar is seized to the
shaft; my impeller puller is tearing the rubber all to shreds (shame,
too, as the vanes were fine) but not budging the collar.

The pump is a gear-driven raw water pump for a propulsion engine, and
it's off the engine at the moment, replaced by a spare when it started
leaking from the shaft. I have all the parts to rebuild it, if I can
ever get it apart.

I've tried penetrating oil with no effect, and I'm out of tricks. Before
I have to throw in the towel and send the whole pump to Depco I thought
I'd see if anyone here has a trick I missed.

-Sean
m/y Vector
lying Fort Lauderdale, FL
http://OurOdyssey.BlogSpot.com

Folks, I need your best advice on how to remove a recalcitrant impeller. It's about 2" diameter and 4" long and is the type with two flats on the shaft rather than splines. It would appear the collar is seized to the shaft; my impeller puller is tearing the rubber all to shreds (shame, too, as the vanes were fine) but not budging the collar. The pump is a gear-driven raw water pump for a propulsion engine, and it's off the engine at the moment, replaced by a spare when it started leaking from the shaft. I have all the parts to rebuild it, if I can ever get it apart. I've tried penetrating oil with no effect, and I'm out of tricks. Before I have to throw in the towel and send the whole pump to Depco I thought I'd see if anyone here has a trick I missed. -Sean m/y Vector lying Fort Lauderdale, FL http://OurOdyssey.BlogSpot.com

RL

Roger Lalonde

Sun, Mar 27, 2016 11:47 AM

Sean,

Remove all the rubber from the shaft, then lay the pump in water with the
opening facing up, in just enough to cover the bottom of the housing.

Then use a propane torch and get very close to the sleeve and heat it up for
a few seconds then back off for a few seconds then repeat this a few times.
Then try a pair of vise grips to grab the sleeve.

By heating, the brass sleeve will expand faster than the steel shaft and
free up from the shaft.

Roger
Summerstown On Canada

-----Original Message-----
From: Sean Welsh via Trawlers-and-Trawlering
Subject: T&T: Removing seized water pump impeller

Folks,

I need your best advice on how to remove a recalcitrant impeller. It's
about 2" diameter and 4" long and is the type with two flats on the
shaft rather than splines. It would appear the collar is seized to the
shaft;

-Sean
m/y Vector
lying Fort Lauderdale, FL
http://OurOdyssey.BlogSpot.com

Sean, Remove all the rubber from the shaft, then lay the pump in water with the opening facing up, in just enough to cover the bottom of the housing. Then use a propane torch and get very close to the sleeve and heat it up for a few seconds then back off for a few seconds then repeat this a few times. Then try a pair of vise grips to grab the sleeve. By heating, the brass sleeve will expand faster than the steel shaft and free up from the shaft. Roger Summerstown On Canada -----Original Message----- From: Sean Welsh via Trawlers-and-Trawlering Subject: T&T: Removing seized water pump impeller Folks, I need your best advice on how to remove a recalcitrant impeller. It's about 2" diameter and 4" long and is the type with two flats on the shaft rather than splines. It would appear the collar is seized to the shaft; -Sean m/y Vector lying Fort Lauderdale, FL http://OurOdyssey.BlogSpot.com

SW

Sean Welsh

Mon, Mar 28, 2016 9:40 PM

On 03/26/2016 06:04 PM, Sean Welsh wrote:

I need your best advice on how to remove a recalcitrant impeller.

Thanks for all the suggestions on and off list. What finally worked was
a good soak with PB Blaster, then setting an appropriately sized socket
on top of the hub and whacking it with a 4# engineer hammer. Wrong
direction, of course, but it got it loose.

Once the impeller and wear plate were out I found the source of the leak
-- the clip ring holding the spring in place for the ceramic seal had
completely disintegrated.

Now I'm trying to get the two bearings out without damaging the shaft...
I was hoping I could drift them out but it is looking like I will need
to find someone with a press. I can't see any way to do it other than to
apply pressure to the shaft.

-Sean
m/y Vector
lying Fort Lauderdale
http://OurOdyssey.BlogSpot.com

On 03/26/2016 06:04 PM, Sean Welsh wrote: > > I need your best advice on how to remove a recalcitrant impeller. Thanks for all the suggestions on and off list. What finally worked was a good soak with PB Blaster, then setting an appropriately sized socket on top of the hub and whacking it with a 4# engineer hammer. Wrong direction, of course, but it got it loose. Once the impeller and wear plate were out I found the source of the leak -- the clip ring holding the spring in place for the ceramic seal had completely disintegrated. Now I'm trying to get the two bearings out without damaging the shaft... I was hoping I could drift them out but it is looking like I will need to find someone with a press. I can't see any way to do it other than to apply pressure to the shaft. -Sean m/y Vector lying Fort Lauderdale http://OurOdyssey.BlogSpot.com

trawlers@lists.trawlering.com

Removing seized water pump impeller