Reply
 
Thread Tools Display Modes
 
Old 09-24-2013, 02:55 PM   #1
Member
 
Cantina's Avatar
 
City: Newport Beach, ca
Vessel Name: CANTINA
Vessel Model: PT Europa Sedan 41
Join Date: Jan 2010
Posts: 19
Unhappy Impeller Cover Plate leak

I changed the impeller the other day on a 1986 Westerbeke generator and when tested, it leaked water at the base of the cover plate ( drip per second ).
I cleaned the cover plate inside and out and covered the new paper gasket with a coating of oil prior to screwing it back in place. Checked the screws after noticing the drip, but they were all tight.
Wondering if a double gasket might be the answer. Anybody have this happen to them?
__________________
Advertisement

Cantina is offline   Reply With Quote
Old 09-24-2013, 03:13 PM   #2
Guru
 
MurrayM's Avatar
 
City: Kitimat, North Coast BC
Country: Canada
Vessel Name: Badger
Vessel Model: 30' Sundowner Tug
Join Date: Jul 2012
Posts: 3,321
Don't know if this will work with your generator, but it worked great on our main engine (Yanmar);

Welcome to Speedseal
__________________

__________________
"The most interesting path between two points is not a straight line" Murray Minchin
MurrayM is online now   Reply With Quote
Old 09-24-2013, 03:20 PM   #3
TF Site Team
 
Larry M's Avatar
 
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 5,725
It happened to us. Check the face of the pump. We scratched the face getting an impellor out. If it's smooth with no nicks, try flipping the cover plate over with a new gasket.
Larry M is online now   Reply With Quote
Old 09-24-2013, 03:35 PM   #4
Guru
 
Shoalwaters's Avatar
 
City: Rodney Bay Lagoon
Country: St. Lucia, West Indies
Vessel Name: "Dragon Lady"
Vessel Model: DeFever 41
Join Date: Feb 2008
Posts: 681
Cantina, you say "cleaned the cover plate inside and out". Did you scrape the mating surface of the pump body as well as the cover plate? Some of the old paper gasket can easily get left behind on the pump flange. It may be difficult to see, but it will make the joint leak. Let us know what you find.
__________________
Mike
If all else fails, read the instructions
If it ain't broke, don't fix it
Shoalwaters is offline   Reply With Quote
Old 09-24-2013, 03:59 PM   #5
Member
 
Cantina's Avatar
 
City: Newport Beach, ca
Vessel Name: CANTINA
Vessel Model: PT Europa Sedan 41
Join Date: Jan 2010
Posts: 19
Thanks all...I will check out Speedseal Murray, thanks.
Larry, I cleaned the plate on both sides with a wire brush and it looked almost like new.
Maybe a wire brush should not be used, not sure. I will remove the plate and try a new
( thicker) gasket and possibly flip the plate. I did notice some wear on the inside of the plate due to the spinning of the impeller, but not along the edges where it might cause a leak.
Mike, I'll be looking close when I reopen, but doubt if there was any gasket remaining.
I will repost with my result. Thanks again.
Cantina is offline   Reply With Quote
Old 09-24-2013, 04:07 PM   #6
Guru
 
Edelweiss's Avatar
 
City: PNW
Country: USA
Vessel Model: 1976 Californian Tricabin LRC
Join Date: May 2011
Posts: 1,834
Doubling the gasket usually isn't a good idea on an impeller pump. You're also moving the cover plate face away from the impeller.

Make sure that the cover plate is completely flat and true. No scratches or grooves worn in the plate. Same for the pump face, it also must be true to seal properly. If you have some very fine, like 400 - 600 grit sand/emery paper, lay it face up on a flat surface. Slide the pump cover, face down, over the sand paper lightly in a circular motion. Observe the plate face for any uneven wear. That will show any uneven spots on the cover.
__________________
Larry B
Careful . . .I Have a Generator and I'm not afraid to use it !
Edelweiss is offline   Reply With Quote
Old 09-24-2013, 04:09 PM   #7
Scraping Paint
 
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
(Cantina--- Sent you a Private Message about cover plates.)
Marin is offline   Reply With Quote
Old 09-24-2013, 04:51 PM   #8
Guru
 
River Cruiser's Avatar
 
City: UMR MM283
Country: US
Vessel Name: Northern Lights II
Vessel Model: Bayliner 3870
Join Date: Jan 2013
Posts: 1,226
I had the same problem on a 8.0 Westerbeke, I had replaced the impeller & the plate, turned out the bottom of the plate was making contact against a raised area on the pump body where the lower hose nipple is. I filed a small chamfer on the new plate & problem solved, these were genuine westie parts. Good luck
__________________
Ron on Northern Lights II
I don't like making plans for the day because the word "premeditated" gets thrown around in the courtroom.
River Cruiser is offline   Reply With Quote
Old 09-24-2013, 05:03 PM   #9
TF Site Team
 
FlyWright's Avatar
 
City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 10,170
Flipping the backplate (if flawed) is a good recommendation.

Another option to improve your gasket seal is to use a very thin coat of Permatex Ultra Black sealant. With rubber gloves on, place a dab of sealant on your index fingertip and mix it slightly with the thumb and index fingertips. Slide the gasket between these fingertips, spreading the sealant thinly along both surfaces of the gasket. When you're done, you'll have a very thin coating on the gasket with no globs or gaps.



(Cantina, no private message sent. I have shared my input here on the public forum.)
__________________
Al

Custom Google Trawler Forum Search
FlyWright is offline   Reply With Quote
Old 09-24-2013, 05:40 PM   #10
Guru
 
Tom.B's Avatar
 
City: Cary, NC
Country: USA
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,152
Double-gasket is asking for a worse leak. You may have either scratched it or might have missed just a tiny piece of old gasket material. If it didn't leak before and does now, you probably missed something simple. Look again. I'm sure you'll find it.
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
Tom.B is offline   Reply With Quote
Old 09-24-2013, 05:44 PM   #11
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 9,995
Greetings,
Mr. FW. Thank you for sharing. I suspect Mr. Marin is discussing under cover plates. Shhhhh......
__________________
RTF
RT Firefly is online now   Reply With Quote
Old 09-24-2013, 11:21 PM   #12
Guru
 
Forkliftt's Avatar
 
City: Biloxi Mississippi
Country: USA
Vessel Name: Patricia Louise II
Vessel Model: 1983 42' Present Sundeck
Join Date: Oct 2007
Posts: 2,433
Cantina
It's also possible the cover plate is slightly distorted. A neat trick for correcting something like this is to fasten a 6" self adhesive DA sander disc (320 is good) on a pane of glass purchased at the hardware store. The glass is "true" and you can swirl your cover plate on the sandpaper- effectively "lapping" and removing high spots.
__________________
Steve Point Cadet/ Biloxi, Mississippi USA
*Present 42 twin 135 Lehmans
Forkliftt is offline   Reply With Quote
Old 09-25-2013, 01:54 AM   #13
Guru
 
C lectric's Avatar
 
City: Somewhere
Country: , Canada
Vessel Name: Island Pride
Vessel Model: Palmer sedan 32'
Join Date: Oct 2007
Posts: 1,864
If the sealing face on the pump body has any dings, raised spots from prying or left over gasket bits that can all be removed and flattened with the use of a stone.
A 2 x 8" stone and some wd 40 or similar will flatten and clean the face . Just be carefull to not bear down on any one place , keep moving it.
If there are high spots they will very quickly show as shiny when the surrounding area is dull.
You are not trying to remove a bunch of metal, just clean and knock off high spots.
Same for the cover plate or the sandpaper on glass as suggested.
Tighten the screws in a pattern snugging a bit at a time rather than tighten one all the way and then go to the next.
C lectric is offline   Reply With Quote
Old 09-30-2013, 07:36 PM   #14
Member
 
Cantina's Avatar
 
City: Newport Beach, ca
Vessel Name: CANTINA
Vessel Model: PT Europa Sedan 41
Join Date: Jan 2010
Posts: 19
It Works!! I ended up flipping the cover plate. The inside was scored and the outside had no serial numbers or engravings, so I sanded it first, cleaned it and ended up cutting a new gasket from gasket paper I bought at an engine parts store. I first coated both sides of the new gasket with "Gasgacinch" gasket sealer and screwed it back on. NO DRIPS. Thanks for the advice.
Cantina is offline   Reply With Quote
Old 09-30-2013, 08:15 PM   #15
Guru
 
Forkliftt's Avatar
 
City: Biloxi Mississippi
Country: USA
Vessel Name: Patricia Louise II
Vessel Model: 1983 42' Present Sundeck
Join Date: Oct 2007
Posts: 2,433
Well done!
__________________
Steve Point Cadet/ Biloxi, Mississippi USA
*Present 42 twin 135 Lehmans
Forkliftt is offline   Reply With Quote
Old 09-30-2013, 09:05 PM   #16
TF Site Team
 
FlyWright's Avatar
 
City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 10,170
Quote:
Originally Posted by Cantina View Post
It Works!!
__________________
Al

Custom Google Trawler Forum Search
FlyWright is offline   Reply With Quote
Old 10-01-2013, 05:58 AM   #17
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,515
When ever I replace a cover plate I use SS allen head machine screws.

These can be easily removed by touch , no need to see a screw head or screwdriver slot.

As the can fall on assembly , either use masking tape to hold it on to the wrench , or purchase a dozen .

Any large glass shop will have scrap glass from a broken table or similar.

Have them cut and edge a piece of 1/2 in or thicker about the size of a book will not break in a drawer and is nice and flat.

Fine sandpaper works for some things , but coarse valve grinding compound does a better job.
FF is offline   Reply With Quote
Old 10-01-2013, 06:55 AM   #18
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 9,995
Greetings,
When lapping, polishing on a piece of glass or flat, a figure "8" motion is more effective and even than a circular one. Turning the piece 90 degrees every so often helps as well.
__________________
RTF
RT Firefly is online now   Reply With Quote
Old 10-01-2013, 07:38 PM   #19
Member
 
Cantina's Avatar
 
City: Newport Beach, ca
Vessel Name: CANTINA
Vessel Model: PT Europa Sedan 41
Join Date: Jan 2010
Posts: 19
Somebody should compile all these great tips into a BOOK!! How bout Marin?
Cantina is offline   Reply With Quote
Old 10-01-2013, 07:40 PM   #20
Guru
 
Forkliftt's Avatar
 
City: Biloxi Mississippi
Country: USA
Vessel Name: Patricia Louise II
Vessel Model: 1983 42' Present Sundeck
Join Date: Oct 2007
Posts: 2,433
Quote:
Originally Posted by Cantina View Post
Somebody should compile all these great tips into a BOOK!! How bout Marin?
Cantina, I've sent you a PM.
NA...... Just kidding
__________________

__________________
Steve Point Cadet/ Biloxi, Mississippi USA
*Present 42 twin 135 Lehmans
Forkliftt is offline   Reply With Quote
Reply

Thread Tools
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





All times are GMT -5. The time now is 11:03 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012