Author Topic: Impellers  (Read 5201 times)

stickandrudderman

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Re: Impellers
« Reply #25 on: July 10, 2020, 10:07:28 »
OK, I've answered my own question.
There's a brass bellows that slides over the shaft which is locked to the shaft by a locking plate and circlip.
The "O" ring on the shaft seals inside that bellows to prevent the passage of fuel up the shaft, into the motor body and out through the two small vent holes.

PeterPortugal

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Re: Impellers
« Reply #26 on: July 10, 2020, 14:01:01 »
Colin,

Those two inserts, and the holes in the side of the casing, are above the hole which allows leakage out to the little pipe stub. To go back to your original question it is still not easy to understand why fuel would come out of the holes in preference to the pipe.

I will be real interested in the answer if anybody does come back with one.

Regards

Peter
1963 220se Cabrio
1968 280se Coupe

thelews

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Re: Impellers
« Reply #27 on: July 10, 2020, 18:33:35 »
OK, I've answered my own question.
There's a brass bellows that slides over the shaft which is locked to the shaft by a locking plate and circlip.
The "O" ring on the shaft seals inside that bellows to prevent the passage of fuel up the shaft, into the motor body and out through the two small vent holes.

Correct.  There is a write-up in the tech section with pictures
Enjoy some pictures at this link:
http://www.flickr.com/photos/8292359@N06/sets/72157603240571101/show/

John - Wisconsin
1967 Early 250 SL Red/Caviar, Manual #1543
1961 190 SL 23K miles
1964 Porsche 356
1970 Porsche 911E
1991 BMW 318is
1966 Jaguar XKE
1971 Alfa Romeo GTV 1750

BaronYoungman

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Re: Impellers
« Reply #28 on: July 11, 2020, 06:03:42 »
I wish I could help regarding the long pumps.  I have tried working on them in the past but I have been frustrated  with the system, so I've just concentrated my efforts on the short pump, which due to its design and materials I can guarantee performance and tight seals.  By applying more modern materials and Technology in both Viton gaskets and improved techniques / glues for Armature rewinding I have actually improved on the original designs. Although again I'm improving on a design that has lasted in some pumps 40 years plus which I'm always amazed by when I get them to rebuild.  Some have never been taken apart since they left the factory.  This just demonstrates a good and robust original design of the pump. Bob
Bob "Baron" Youngman
1971 280 SL silver  1 car 0 boxes
1983 500sec Wheeler Dealer AMG w AMG coupe
1965 220se coupe restomod
1988 560sec  Japan "Yakuza Car"