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Author Topic: Output shaft seal  (Read 2977 times)

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Offline mojosmr

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Output shaft seal
« on: May 10, 2011, 02:06:49 PM »
Mojos mr here, finally got my own user account, thanks for lettin' me skate by  for years.
I got a question on the SR4 Output shaft seal.
The part # for a 23 spline is a national seal 472439 calls out for 1.875 shaft, 2.623 housing bore.
I measured the shaft and it mic'd at 1.937, very clearly.  Why would they put a seal in with a 32nd of interference.
has anyone ever put in a seal with a shaft diameter of 1.9375?
By the way the spirit is coming along swell.  This is for the eagle though.
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Offline mojobean

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Re: Output shaft seal
« Reply #1 on: May 10, 2011, 07:43:28 PM »
 :hello2:  YAY!!! now everyone will be able to differentiate which of us is posting.
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Offline mudkicker715

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Re: Output shaft seal
« Reply #2 on: May 10, 2011, 07:49:35 PM »
Quote from: mojobean on May 10, 2011, 07:43:28 PM
:hello2:  YAY!!! now everyone will be able to differentiate which of us is posting.

Duhhh should have egged him for that. Haha I gave the first.
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Manitowoc WI

68AMXGOPAC

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Re: Output shaft seal
« Reply #3 on: May 10, 2011, 07:55:36 PM »
Let the egggging commence !! and no I haven't a reasonable answer for that question. If I understand it right you are looking at the difference between the shaft o.d. and seal i.d. ??If I remember it just kinda flares out over onto the shaft surface instead of haveing just a thin contact point the thinckness of the seal material.....or are you asking about the seal o.d. and the hole in the case where it goes i.d. ??
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Offline mojosmr

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Re: Output shaft seal
« Reply #4 on: May 11, 2011, 02:38:53 PM »
the shaft O.D and the seal I.D.  THE SPECIFIED SEAL FOR THE  NP119 IS A FULL 1/16TH SMALLER THAN THE SHAFT O.D.
I WAS CONCERNED ABOUT THE AMOUNT OF INTERFERENCE (caps lock) that would introduce.  Is it normal to have a 32nd of interference on a shaft.  I'm probably getting to cranial with it.  I put the 1.875 seal in, I was just wondering if that was normal interference for wear purposes. :-\ 
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Offline mudkicker715

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Re: Output shaft seal
« Reply #5 on: May 11, 2011, 03:09:09 PM »
Not certain on this specific part. But similar gaskets are that way as well.
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Manitowoc WI

Offline mojosmr

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Re: Output shaft seal
« Reply #6 on: May 11, 2011, 03:24:50 PM »
Right on.  I'll put that issue to bed, thanks for the input.  I downloaded a an interchange manual for national seals that allow me to cross reference size so I can avoid the middle man and go to my seal vendor.  I'm tired of getting gouged for 3 or 4 dollar seals. 
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