[Healeys] Ring gear not fully seated in flywheel

richard mayor mayorrichard at hotmail.com
Tue Jan 20 18:23:46 MST 2015


So here's a little more info about the BJ8 engine with the ring gear halfway on.... or halfway off.....depending on one's perspective.  I learned from Steve Byers (BJ8 registrar) that the car that had that engine is in England as of 1989 (or at least a  car that has the body # plate of that car).  Steve happens to have the British Heritage certificate for that car but no owner info. 
Because the ring gear was rubbing on the two upper engine plate bolts and making lots of noise, the diagnosis at the time was certainly some kind of engine failure, and therefore, the engine was pulled. This is an engine that has a little over 5,000 miles on it.
I have a theory as to how this how this happened.  The heads on the bolts are ground down a bit but there is no apparent damage to the ring gear. Obviously, it's a much harder material. The ring gear was up tight against those bolts heads. This leads me to believe that the engagement of the starter must have pulled the ring gear off its perch and up tight against the bolt heads.  
I have this motor for sale on Cragislist in Portland Oregon. I'm not going to fix the ring gear so the new owner of this engine will see what I am talking about and understand why this is such a low mileage 29K motor.

Richard Mayor
Portland, Oregon


Date: Tue, 20 Jan 2015 12:01:58 -0500
From: michaelsalter at gmail.com
To: healeys at autox.team.net
Subject: Re: [Healeys] Ring gear not fully seated in flywheel

I have found the comments on this topic to be very interesting with regards to the heating of the ring gear. I am no metallurgist so I tend to pay attention to manufacturers instructions regarding the heating of metal components very carefully.
In the BN1 workshop manual instructions are given for shrink fitting new brass syncro cones onto the gears. The instructions read: 
"The heating (of the syncro ring) can best be done by immersion in oil of 250 degrees Fahrenheit and then fitting by means of a hand press. After shrinking on, the unit should be immediately be quenched in water to prevent the heat softening the gear itself.
250 degrees Fahrenheit is the equivalent of 121 degrees Centigrade. 
Well, if we are going to be heating the actual RING GEAR to 2 or 300 degrees Centigrade should we not perhaps be a tad concerned about heat softening the ring gear??
Just a thought....

Michael S
BN1 #174

On Mon, Jan 19, 2015 at 8:30 PM, Steve Gerow <steveg at abrazosdata.com> wrote:
Chris – I’ve had my Weber gas grill will close to 400 degrees C. Understand from many videos grilling is big in OZ – suggest use of barbie rather than wife’s stove for heating of ring gear.  --Steve GerowAltadena, CA, USABN6 & Weber S330
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