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General Category => General Discussion => Topic started by: dxhall on June 17, 2018, 10:04:06 PM

Title: Leaking crankshaft seal
Post by: dxhall on June 17, 2018, 10:04:06 PM
The Centauro motor I put together this spring runs well, but the lip seal on the crankshaft behind the alternator leaks.  Any thoughts on what I did wrong? 
Title: Re: Leaking crankshaft seal
Post by: Antietam Classic Cycle on June 17, 2018, 10:19:47 PM
The Centauro motor I put together this spring runs well, but the lip seal on the crankshaft behind the alternator leaks.  Any thoughts on what I did wrong?

There's an o-ring too. #7 in this illustration:
(https://www.stein-dinse.biz/bilder/auto/breite_800/0002372e.jpg)
https://www.stein-dinse.biz/bilder/auto/breite_800/0002372e.jpg
 
Title: Re: Leaking crankshaft seal
Post by: guzzisteve on June 17, 2018, 10:22:57 PM
Why do you think you did something wrong?  I use tape over keyways & threads or anything that might damage it on instillation.
Didn't leak right away did it? 

Charlie's got an idea
Title: Re: Leaking crankshaft seal
Post by: pete roper on June 17, 2018, 10:28:12 PM
There's an O-ring inside the part#8, the sleeve isn't there? Was that replaced and lubed as it went in/on? Also the front seal should be a directional Viton one I believe? If a Nitrile one was substituted it won't of lasted long due to the heat.

Pete
Title: Re: Leaking crankshaft seal
Post by: guzzisteve on June 17, 2018, 10:43:03 PM
I think the seal rides on #8 and in the pic oring is on the wrong side of it.
Title: Re: Leaking crankshaft seal
Post by: dxhall on June 18, 2018, 06:41:08 AM
I replaced the lip seal, but reused the o ring because it seemed to be ok.  Have there been any reports of poor quality seals?  I don’t like to just replace parts without knowing what caused the failure - that usually leads to repetition of the same mistake.
Title: Re: Leaking crankshaft seal
Post by: Mike Tashjian on June 18, 2018, 07:47:07 AM
O rings are usually deformed to some degree in regular service.  I always replace them with new  when things are apart.  Mike
Title: Re: Leaking crankshaft seal
Post by: guzzisteve on June 18, 2018, 10:06:06 AM
I use the Viton(brown) seals if they have them in that size and always new orings.
Title: Re: Leaking crankshaft seal
Post by: dxhall on June 18, 2018, 01:53:26 PM
Not seeing the viton seal on the MG Cycle website.  Do you know who stocks it?
Title: Re: Leaking crankshaft seal
Post by: guzzisteve on June 18, 2018, 02:13:27 PM
Not seeing the viton seal on the MG Cycle website.  Do you know who stocks it?
I have not put one in a Daytona, I was just explaining that I use them if I can get them.
You may want to call MG and see if they can get them.
Title: Re: Leaking crankshaft seal
Post by: Antietam Classic Cycle on June 18, 2018, 02:38:00 PM
Not seeing the viton seal on the MG Cycle website.  Do you know who stocks it?

"Temporarily out of stock":
http://www.mgcycle.com/index.php?main_page=product_info&products_id=1353
Title: Re: Leaking crankshaft seal
Post by: pete roper on June 18, 2018, 04:54:34 PM
What size is it? While you may not easily be able to get a directional one from a bearing factor I'm sure you can pick up a standard Viton seal and O-Ring from there. Canberra isn't a big town, somewhere between 400-450,000 souls, but our local suppliers always seem to be able to get me most things I need within a day or so.

Pete
Title: Re: Leaking crankshaft seal
Post by: Antietam Classic Cycle on June 18, 2018, 05:36:14 PM
What size is it? While you may not easily be able to get a directional one from a bearing factor I'm sure you can pick up a standard Viton seal and O-Ring from there. Canberra isn't a big town, somewhere between 400-450,000 souls, but our local suppliers always seem to be able to get me most things I need within a day or so.

Pete

28 x 38 x 7.
http://www.harpermoto.com/17-gasket-ring-28x38x7.html

O-ring:
http://www.harpermoto.com/37-o-ring-17-86x2-62.html
https://www.mcmaster.com/#9262K974