there os a drain tube in the main bearing cap to drain the oil back into the
oilpan
Bruce
----- Original Message -----
From: "Steve Belfer" <colordog.1@earthlink.net>
To: "Friends of Triumph" <fot@autox.team.net>; "Tony Drews"
<tony@tonydrews.com>
Sent: Saturday, August 11, 2007 3:22 PM
Subject: Re: [Fot] TR3 main seal question
> Thanks again, Tony. Y'know, I thought it looked like it was designed to
> pump the oil back into the block. It worked well before so I'm not going
> to
> do the mod.
> I'd call this an "Anti-Leak pump, rather than a seal. " :)
>
> ~Steve
> ----- Original Message -----
> From: "Tony Drews" <tony@tonydrews.com>
> To: "Steve Belfer" <colordog.1@earthlink.net>; "Friends of Triumph"
> <fot@autox.team.net>
> Sent: Saturday, August 11, 2007 12:02 PM
> Subject: Re: [Fot] TR3 main seal question
>
>
>> That's a "scroll seal". The grooves in the crank spiral from the
>> flywheel
>> toward the inside of the block. The theory, as I understand it, is it
>> will sling the oil back into the block. If you get the aluminum halves
>> really close to the crank, it kinda works too. The common modification
>> is
>> to get the rubber seal kit from BFE or Moss (maybe British Parts
>> Northwest
>> ?). In order to use that kit, you need to have the scroll seal machined
>> off of the crank so it's a nice flat surface of the correct diameter.
>> Then the aluminum halves are machined to fit a relatively normal seal. I
>> believe the machined housings come with the kit. But, it's a split seal
>> so you can get it around the crank. It's still not a perfect solution
>> and
>> is a bit finicky to get to seal.
>>
>> Cambridge sells a crankshaft and flywheel where the whole flange at the
>> end of the crank is not there. The seal diameter continues to the end of
>> the crank. That allows you to slip a normal seal over the end of the
>> crank and make it really stop leaking (at least from the rear main).
>>
>> I just test the oil puddle under the drain hole in the bellhousing every
>> so often to see if it's motor oil or tranny fluid. (stick a finger in
>> it,
>> rub it together, smell it for the gear lube sulfur smell) If it's motor
>> oil, and the puddle isn't too big, I figure all is OK.
>>
>> - Tony Drews
>>
>> At 01:10 PM 8/11/2007, Steve Belfer wrote:
>>>I've just dissassembled my spare TR3 race motor and taken the parts to a
>>>local
>>>machine shop and here's a silly question. When looking at the two
>>>aluminum
>>>half-circle's that bolt up to the block with the eight bolts (the main
>>>seal
>>>assy.) What the heck keeps the oil IN? I see three or four grooves on
>>>the
>>>crank where it fits into the seal that appear to match up with the
>>>grooves
>>>inside the seal. If the crank spins freely, what exactly keeps the
>>>pressurized oil from blowing past this circular seal?
>>>
>>>Please, no leaky triumph jokes ;)
>>>
>>>~Steve
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