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air head guys !
Alfetta:
Thanks Dirk and ACC... Once i saw dimensions were given on Bob's web page, i placed an order at local bearing supply house.
This looks like a challenge to extract the needle bearing without damage. I don't see much space between the end on the bearing and the lip seal for a extraction tool.
and i may be pulling on the thin wall on the bearing end. Not a friendly seal to service, that's for sure.
Antietam Classic Cycle:
--- Quote from: Alfetta on December 06, 2024, 07:48:16 AM ---Thanks Dirk and ACC... Once i saw dimensions were given on Bob's web page, i placed an order at local bearing supply house.
This looks like a challenge to extract the needle bearing without damage. I don't see much space between the end on the bearing and the lip seal for a extraction tool.
and i may be pulling on the thin wall on the bearing end. Not a friendly seal to service, that's for sure.
--- End quote ---
I've never done the job on a BMW, but on big-block Guzzi rear drives I heat the housing in an oven (or on the woodstove in Winter) and the outer race of the needle bearing either falls out by itself or after a few bonks onto a piece of soft wood. When installing, chill the bearing and warm the housing.
guzzisteve:
I used to work on them everyday, haven't since 90's. You need to pull out needle bearings, similar to Guzzis. BMW has a special puller for it as I believe.
When finished you need to check contact area w/ink or blueing. Good Luck. Another source is Nathen at BoxerWorks in Watkinsville, GA. Good Luck, I don't miss it at all.
n3303j:
Get out the torch and heat the aluminum housing a bunch (or throw it on the barbecue).
The steel parts expand a lot less than the aluminum.
The steel parts will almost fall out.
Alfetta:
I cant get it much hotter that 150F as i don't plan on extracting the pinion gear. and i am not touching the seals on that shaft.
The intent is to get this old girl operational at a minimum cost. but the crown wheel was leaking badly so it must be corrected.
ring and pinion are in very good shape. so if i don't pull the pinion and return the original crow wheel shims, it should be good enough.
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