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Oil pump seal direction

  • Superdad60
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Oil pump seal direction was created by Superdad60

1978 DT400E
Easy one…. Which direction does that oil pump seal face in the clutch cover?

flat side - inward towards crank….
and open with tiny spring side - towards pump?
or vice versa

kindergarten question but diagrams don’t really show
 
Last edit: 03 Mar 2024 05:59 by Superdad60.
03 Mar 2024 05:16 #1

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  • MarkT
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Replied by MarkT on topic Oil pump seal direction

If I remember correctly, the seal pressed into the clutch cover is installed "vice versa" using your description. 

Which way was it installed?
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
03 Mar 2024 07:01 #2

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  • Superdad60
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Replied by Superdad60 on topic Oil pump seal direction

I have yet to put the cover back on as I'm waiting for the gasket to arrive
Time to think and second guess my self
I think I pressed the seal into the case cover with the open end and spring facing me / the crank...

Another reason to take a photo... think I'd learned
Sometimes it's 2 weeks between dis-assemble and re-assemble 
Last edit: 03 Mar 2024 07:17 by Superdad60.
03 Mar 2024 07:16 #3

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Replied by Tinkicker on topic Oil pump seal direction

That is the correct way.  There is little to no pressure other than a small head of oil in the oil pump casing, so the seal does not need to be 100% efficient.  Either way, fitting the seal wrong way would not matter.

The transmission side however could have have a significant pressure build up due to blowing crank seal or blocked vent tube.  If this happens, air would slip past the seal and be introduced into the pump casing, stopping it working effectively.  This is bad.

So high pressure side of the seal (garter spring side) should be towards the crank.
The following user(s) Liked this Post: Superdad60, Sneezles61
Last edit: 03 Mar 2024 07:33 by Tinkicker.
03 Mar 2024 07:32 #4

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