| [GMCnet] Double lip seal for front of Onan [message #345680] |
Wed, 24 July 2019 16:05  |
emerystora
Messages: 4442
Registered: January 2004
Karma:
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Senior Member |
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The Original front seal behind the flywheel is an Onan 509-0040. (The rear seal is an Onan 509-0041). The 509-0040 crosses to a National 470162R or SKF11806.
Those are a single lip Viton seal.
I found a double lipped seal that should be much better than the original single lip. It is made of Nitrile rubber which is better than Viton.
CR SKF 11801 (CR = Chicago Rawhide)
I got it at a local bearing supplier but it was a Harwal box.
1.187 x 2.000 x .437
Type: BDL Material: NBR
BDL = Double Lipped
NBR = Nitrile Rubber
It fits right into the opening when tapped into place.
To remove the old one I used a slide puller which had a screw on the end that one normally puts into a hole in a dented piece of metal such as a fender that you are trying to straighten.
You could also try two self tapping metal screws and pull them out with a couple of vice grips.
I drilled a 3//32” hole into the seal and screwed in the slide hammer. (Depending on the size screw you may need a different drill hole).
A couple of slides and the old seal pulled right out.
I greased up the lips and the outer metal of the seal and then used a piece of 1-1/2” pipe (OD=1.9”) to drive in the new seal until it seated.
The double lipped seal would help prevent leakage at the seal. Especially if the old single lipped seal has worn a tiny groove into the shaft.
While you have the flywheel off be sure to check your low oil pressure switch for leakage and also the hanging bracket behind the oil filter.
That bracket has a gasket on both sides of it. You may have to cut your own new gasket if that is leaking. Don't use cork.
For a discussion on the difference between a Viton seal and a Nitrile Rubber seal see: http://www.easternseals.co.uk/viton-fkm-vs-nitrile/
Emery Stora
77 Kingsley
Frederick, CO
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