Wits end ...and past it

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nellyboyo
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Thu May 16, 2019 11:07 am

:oops:
Just fettling my TV200 rebuild and , for the life of me , cannot get the rear hub oil seal to stop leaking after a good run ...Its a TV2 casing and appears to be in good nick all round where the bearing sits so I`d obviously want to keep using that .... so far I have systematically replaced ...
1 . The bearing from a Race Tour one to a new type MB one with seal fitted ...
2. The O ring .
3. The lay shaft
4. The crankcase breather ( removed any mist pad/ wire wool so its just open really )
5. The rear hub shim.
6 . The rear hub and cone
7 . Tried 2 different types of bearing retaining plates ..New recessed MB ones and original , Thick and thin ...

It appears to come straight though the seal when the engine is warm .. I`ll post some pics of it . The bearing is a good fit in the casing ..The both layshafts I used were good , tight fits through the inner race ??/

Does anyone know if there's a possibility of fitting a completely sealed bearing as I`m proper sick of rebuilding it now .... I know they are common size bearings ( 6004 Open Type Deep Groove Ball Bearing 20x42x12mm ) but the lambretta needs that shoulder in it ??

cheers for any help

Warkton Tornado No.1
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Thu May 16, 2019 11:22 am

(You are a lot further on than I am with your TV. Mind you, I now have a complete frame with which to replace the loop etc :roll:)

I know a lot of people have faith in items (re-invented by some business men that would claim to have invented the wheel :D), but you may be better to stick with known products of original manufacture. There are good secondhand OEM Innocenti rear hub bearings available & they are my preference over anything new.

This may seem a silly question, but are you fitting the seal the correct way? The spring should be toward the inside of the engine to resist pressure.

nellyboyo
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Thu May 16, 2019 12:36 pm

ha, no it doesn't seem silly mate ...yes definitely fitted the right way ....I have chucked old bearings ....and yes, my mate mentioned that they were preferable sometimes ...After I had chucked them out :cry:

Warkton Tornado No.1
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Thu May 16, 2019 4:10 pm

I don't have my SKF book to hand, but I looked into the feasibility of a standard bearing some time ago.

As I recall, there is a bearing (with captive seals, I think) with a snap ring to position it axially. It would require a shim to achieve the correct geometry, but worth a look :idea:

nellyboyo
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Fri May 17, 2019 7:30 am

Heres some pics of the leak ......

Image

Image

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HxPaul
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Fri May 17, 2019 9:03 am

Is the crankcase being pressurised in some way,forcing the oil past the oil seal on the rear hub bearing.

alanscottj
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Fri May 17, 2019 9:38 am

Maybe try a oil plug with the breather tube? In case of any crankcase pressure


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Mrnice71
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Fri May 17, 2019 11:21 am

The MB hub bearings are known to be crap l would recommend RIV or Casa , what make of seal is it ? l only use Rolf , l can never even fit the pattern ones without damaging them and warm them up a bit when fitting and lots of seal grease

Muppet
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Fri May 17, 2019 11:24 am

Are you sure that oilseal is seated on the inner bearing track properly?
im not a complete idiot
.
.
s me of the piec s are mis i g

Warkton Tornado No.1
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Fri May 17, 2019 11:26 am

I hate to say it, but I think that seal is fitted the wrong way around...... :|

The lip with spring should be toward the inside.

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