Jay
What Andy has told you is accurate from what I know. The scroll seal on the
early cranks worked just like the scroll seal on the front of the early
stock gearboxes. What is normally done for racing is to have a sleeve made
from stainless steel to eliminate the scroll and bring the diameter out to
match the oil seal dimension of the later cranks. If you don't want to do
this for some reason, I've probably got one or more of the old style "oil
retaining covers" buried in my stash of stuff.
Jim Norlin
-----Original Message-----
From: fot-bounces+norlinengineering=comcast.net@autox.team.net
[mailto:fot-bounces+norlinengineering=comcast.net@autox.team.net] On Behalf
Of Herald948@aol.com
Sent: Wednesday, September 05, 2007 6:31 PM
To: jaxonracing@yahoo.com; fot@autox.team.net
Subject: Re: [Fot] 1147 Crank Seal
In a message dated 9/5/2007 8:37:25 P.M. Eastern Daylight Time,
jaxonracing@yahoo.com writes:
I have located and purchased an 1147 crank for my race car, there is a
difference from the crank I had before in that on the flywheel end of the
crank
there is a "scroll" (looks like threads so as it rotates it returns oil
back
to the block) in the fat end. It appears that this design would "sling"
the
oil back into the block, but I am not sure of the purpose.
My question is, does this type of crank design use the same rear seal as
the
crank without the "scroll"??? Or do I need a different type of seal??
Jay, others will, I'm sure, be able to give you much more detail, but it
sounds like the crank you got is the earlier type and does indeed have the
"scroll" to fling the oil back into the engine. If I remember correctly, it
has --
instead of an oil seal and its housing -- what the spare parts catalogue
calls the "oil retaining cover -- rear." I also recall that this crank was
used
until fairly late in the Mk2 Spitfires, then the later crank was used
through
the early 1296 "small journal" blocks.
--Andy Mace
*Mrs Irrelevant: Oh, is it a jet?
*Man: Well, no ... It's not so much of a jet, it's more your, er, Triumph
Herald engine with wings.
-- Cut-price Airlines Sketch, Monty Python's Flying Circus (22)
Check out the North American Triumph Sports 6 (Vitesse 6) and Triumph
Herald
Database: _http://triumph-herald.us_ (http://triumph-herald.us/)
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