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[Healeys] first motion shaft identity and laygear endfloat

To: "List Healeys" <healeys@autox.team.net>
Subject: [Healeys] first motion shaft identity and laygear endfloat
From: "randy dickson" <rdickson@midwestarchaeology.com>
Date: Sat, 18 Apr 2009 19:36:18 -0500
Fellow Healeyoids,
I'm having trouble identifying which is the correct first motion shaft.  I
have two complete gearboxes plus lots of other parts.  It has been awhile
since I assembled a gearbox so I want to know which first motion shaft goes
with my BJ7 box.  I think that it is the AEC 3472 first motion shaft.  I
know that the BJ8 first motion and main shaft are different.  The other
first motion shaft is a 22 B140 (BJ8???).  It appears that on the BJ7, the
bearings (18) that accompany the first motion shaft are longer, and
different than the BJ8 box.  I've got the BJ7 box mostly together now with
the first motion shaft installed.  I just want to double check, that I have
correct first motion shaft installed.  Endfloat on the laygear is between
.007-.0016. I read that .0012 is the limit, but the end of the laygear is
not perfectly even (thanks to the machine shop). The front of the box
contains the much larger bushing.  Shouldn't the real thrust be toward the
large end anyway? I wonder how long the gearbox will last with a larger
endfloat?  Is it just noisier or does it fail quicker.  Thanks!

Randy
Healey-Archaeologist
63 BJ7
60 BT7
66 Cobra replica
06 Mini cooper S
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