[Fot] TR3 main seal question

[tr3a58 at verizon.net]

I will have to say that I have used Greg's remade seals in at least three street engines and in my TR3A race motor. They work!. Save your old seals and send them to Greg.

Dean T.



>From: Greg Solow <gregmogdoc at surfnetusa.com>
>Date: 2007/08/13 Mon PM 09:49:22 CDT
>To: Randall Young <ryoung at navcomtech.com>, 
	'Friends of Triumph' <fot at autox.team.net>
>Subject: Re: [Fot] TR3 main seal question

>The problem with the original seals is that there is excessive clearance 
>between the crankshaft scroll and the alluminum housing. The factory setup 
>gives .012" clearance on the diameter. That is just to much. We have been 
>"remanufacturing " the seal housing and bringing the clearance down to .006" 
>on the diameter. That works great on a tight engine. There is vitually no 
>leakage unless the engine is reved over 6,000 rpm. At reves over 6,000  the 
>crank begins to flex and it allows a little oil out. For street engines and 
>mild race engines this "blueprinted" seal is the ticket as far as I am 
>concerned.
>    For a high RPM race engine we weld up the threaded area and have it 
>remachined to the original major diameter of the threads and then remachine 
>the original seal holder to use a Chrysler 383 cu in engine 2 piece rubber 
>lip seal. This setup does not leak a drop at engine speed over 7200 rpm.
>    With either of this seal arrangement, concentricity is very iimportant.
>    We will not build and engine using the "Split one piece seal" as sold by 
>Moss. I have tried them 4 times, each time it has taken 5 or 6 hours or more 
>of setup to get the alloy seal holders to fit the block correctly and the 
>seals have still leaked at least a little, sometimes a lot!.
>                                                                             
>Greg Solow
>----- Original Message ----- 
>From: "Randall Young" <ryoung at navcomtech.com>
>To: "'Friends of Triumph'" <fot at autox.team.net>
>Sent: Monday, August 13, 2007 2:42 PM
>Subject: Re: [Fot] TR3 main seal question
>
>
>>> If the crank spins freely, what exactly keeps the
>>> pressurized oil from blowing past this circular seal?
>>
>> A minor point, the oil should not be pressurized by the time it reaches 
>> that
>> seal.  There is a cavity between the seal & bearing, with a drain hole 
>> back
>> into the sump.  Some folks have theorized that the hole isn't big enough,
>> and drilled additional holes, but I haven't seen the need myself.
>>
>> Also note that some of the rubber seal kits on the market have the wrong
>> instructions as to how small to grind the crank.
>>
>> Randall
>> (Tedious but unavoidable disclaimer follows)
>>
>>
>>
>>
>>
>>
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