water pump leakage
-
- Posts: 98
- Joined: Sat May 16, 2009 5:31 pm
water pump leakage
I've been working on my water pump leak at the weep hole for a while, first I had the plate behind the impeller machined, did not work,I replaced the plate with a new one because I was afraid that perhaps too much was machined, did not work. replaced the seal, did not work because some suppliers are using a seal that has 18.9mm I.D., too small for the shaft so when I put it back together the impeller forced the seal over the shaft and it cracked. I finally got one that is 19.8mm from GT car parts, it seemed to work when engine was at temperature but once it cooled off it leaked again. Found out that the original spring wire diameter is supposed to be around .26mm well the only ones that are available now are only .19mm, the heavier spring is rated at 45lbs per inch of compression and the .19 is only rated at 15lbs. I installed a .05" shim behind the seal to preload the spring and so far it's holding perfectly.
Re: water pump leakage
As you discovered, it is all about the spring tension. We always save the used old style "heavy spring" seals and install the old heavier spring in the new seal. You can also convert the pump seal design to the later Daytona/Boxer design with some machine work. This gives a more reliable sealing system.
-
- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: water pump leakage
Hi Dyke, I am rebuilding my 250 motor and the pump worked fine with no evidence of peeing. Would you rebuild or just paint it and bolt it back? Thanks.
john
john
PF Coupe
Re: water pump leakage
He's a Ferrari Specialist, not a soothsayer!John Vardanian wrote:Hi Dyke, I am rebuilding my 250 motor and the pump worked fine with no evidence of peeing. Would you rebuild or just paint it and bolt it back? Thanks.
john
Tom
'63 330 America #5053
Re: water pump leakage
John:
Scott Taylor. a great Ferrari mechanic who is no longer with us, told me years ago "If you go looking for trouble, you will probably find it". As tempting as it may seem to want to rebuild your pump, I would have second thoughts especially if it is working fine. You can always take it off and rebuild it later, as you apparently have already done the hard part in getting the front housing off the studs. On engines that have not been apart for decades, that is usually the hardest part of the job.
Scott Taylor. a great Ferrari mechanic who is no longer with us, told me years ago "If you go looking for trouble, you will probably find it". As tempting as it may seem to want to rebuild your pump, I would have second thoughts especially if it is working fine. You can always take it off and rebuild it later, as you apparently have already done the hard part in getting the front housing off the studs. On engines that have not been apart for decades, that is usually the hardest part of the job.
-
- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: water pump leakage
Thanks Dyke. I was hoping to hear that, just one less thing to do.
john
john
PF Coupe
Re: water pump leakage
Everything Dyke tells here is of very high expierance knowledge.John Vardanian wrote:Thanks Dyke. I was hoping to hear that, just one less thing to do.
john
Probebly the best in technicalquestions here.
But I would replace it nevertheless
If a part is not available I would do it like he says
But in this case you can find a new one very easy and cheap
I did a headgasket replacement on the right side see pics.
with compleet cleaning inside of the engine.. a lot of work
I didnot replace that "good" working seal.
after one month there was again water in the oilsump.
or beter say soapgel
My first thought was of coure a bad repair by me ,but that was this time the WP-seal.
its such a trash this soap.
" Neu bleibt treu" or "new parts give confidance/ faith"
C.
Pics of bad quality by iPhone pic from pics
- Attachments
-
- headgasket repair on one side only.
- IMG_0156.jpg (53.17 KiB) Viewed 10390 times
-
- WP still in place. a mistake
- IMG_0150.jpg (52.45 KiB) Viewed 10390 times
-
- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: water pump leakage
So, then, do I understand it right that if the seal is being repaced one reuses the old spring and all ends up well? Thanks.
john
john
PF Coupe
Re: water pump leakage
John,
Yes thanks to Al P,
The starter of this thread.
Yes thanks to Al P,
The starter of this thread.
Re: water pump leakage
Also take a really good look at the rubber bellows! After the replacement in mine was found to be NG we replaced the weak spring with the original spring, but then the rubber bellows developed a leak. A big leak!. I don't know if it was just bad QC, or a design flaw.
By now, I know how to take the water pump out of my Ferrari. Not that it gets any easier with time.
Cheers
Warren
By now, I know how to take the water pump out of my Ferrari. Not that it gets any easier with time.
Cheers
Warren
330 GT Series II sn 10069
-
- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: water pump leakage
What are the bellows and where are they located exactly. Would they be in the manual diagrams?
john
john
PF Coupe
Re: water pump leakage
Hi John:
I can't find a picture - nor can I find the discarded one I kept for a memento. Maybe someone on the board can provide one. And I don't know about other Models/Engines. Sorry about that Chief. (to quote Maxwell Smart)
But if you take the pump apart you will not have to look for it. The spring is inside it. It is part of the seal between the back of the impeller and the housing.
Cheers
Warren
I can't find a picture - nor can I find the discarded one I kept for a memento. Maybe someone on the board can provide one. And I don't know about other Models/Engines. Sorry about that Chief. (to quote Maxwell Smart)
But if you take the pump apart you will not have to look for it. The spring is inside it. It is part of the seal between the back of the impeller and the housing.
Cheers
Warren
330 GT Series II sn 10069
Re: water pump leakage
It's all part of the w/p assembly. As the spring compresses against the back of the impeller, the rubber body of the seal flexes. I'll see if I can take a picture of a w/p seal next week.whturner wrote:Hi John:
I can't find a picture - nor can I find the discarded one I kept for a memento. Maybe someone on the board can provide one. And I don't know about other Models/Engines. Sorry about that Chief. (to quote Maxwell Smart)
But if you take the pump apart you will not have to look for it. The spring is inside it. It is part of the seal between the back of the impeller and the housing.
Cheers
Warren
Tom
'63 330 America #5053
-
- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: water pump leakage
Is this what you're looking for John?John Vardanian wrote:Anyone has a picture of a 250 water pump apart? Thanks.
john
Tom
'63 330 America #5053