[Fot] fot crank cross drilling

[Richard Taylor]

I'm looking at the broken-off piece of my TR-4 crankshaft. It broke right
where it is supposed to, at the #3 throw.

The rear main journal has one hole about the size of a 5.5mm Allen wrench
angling in toward the throw. The #4 rod journal has a similar sized hole
running all the way across creating two oiling ports. There is also a
smaller (2mm Allen wrench) that goes half way through. It is on the outboard
side of the journal but apparently ends in the cross-drilled passageway,
thus creating a third, much smaller, oiling point.

When I backed out the Allen nut that appears to be an inspection port, there
is a batch of pasty grey stuff that looks like a bearing emulsion. 

Hope this helps.



Richard  L. Taylor, Jr.,  FAIA


-----Original Message-----
From: fot-bounces+tarch=bellsouth.net at autox.team.net
[mailto:fot-bounces+tarch=bellsouth.net at autox.team.net] On Behalf Of
rikrock at aol.com
Sent: Thursday, May 08, 2008 3:03 PM
To: fot at autox.team.net
Subject: Re: [Fot] fot crank cross drilling

Not exactly;-)

When I say "cross-drilled journal", I'm?talking about?the holes you can
easily SEE when you look at the crank.? I don't know what to call the hole
(passageway)?inside the crank that carries the oil from the main journal to
the rod journal.

So,?my??question is... if you were having a TR4 crank custom built, how many
holes that you can easily SEE in the main and rod jounals?ought there? be?? 

Thanks!

Rich Rock


-----Original Message-----
From: DSPGTi at aol.com
To: Rikrock at aol.com; fot at autox.team.net
Sent: Thu, 8 May 2008 4:49 pm
Subject: Re: [Fot] fot crank cross drilling




I believe a stock TR4 crank has one hole drilled thru the crank journal that
carries the oil from the main bearing housings into the crank and passes to
each rod journal. The stock crank has one set of cross drill holes in the
rod journals to carry the oil out to the rod bearings plus a second set,
what we are refering to as "cross drilled" at 90 degrees of each other.

?

Moldex is recommending just single passages on each journal. We think two on
the rods and maybe the mains as well? Rich thinks a stock crank has a very
small set of holes in the mains but we don't have a crank in our hands right
now to look and confirm.

?

Am I making it clear now?





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