Paul: The reason for the extra holes is to decrease pressure on the seal.
Prior to this mod there were reports of seals leaking. I haven't had any
problems with mine, I would recooend drilling. The hole in quest is the
hole in the bottom center of the main withe the drain extension attached.
Drill paralell on both sides.
Bob Roberts
TR$
----- Original Message -----
From: "Paul Dorsey" <dorpaul@negia.net>
To: "triumph list" <triumphs@autox.team.net>
Sent: Wednesday, December 08, 2004 12:02 AM
Subject: TR4: lip seal for rear crank seal
> Jim,
> I think I've read where one can completely forget about drilling these
> holes,
> is this right list??????
> Paul Dorsey
> TR4A engine
>
> ----------------------------------------------
>
> Folks,
> I have a kit which converts the rear crank seal from the scroll to a lip
> seal. The instructions which accompanied the kit say to drill two more
> oil
> drain holes in the main bearing cap. Fine, except that my cap has two
> holes and I'm not sure which is supposed to be duplicated. One hole is
> 3/16" in diameter and seems to drain the seal area. The other is much
> larger (13/32") and is adjacent to the bearing shell.
>
> I *believe* that the larger hole is to be duplicated; I'd appreciate
> concurrence that the larger hole is the target before
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