[Healeys] BJ8 tach disassembly

Bob Spidell bspidell at comcast.net
Wed Mar 6 08:24:53 MST 2019

Michael, how do you know?

I'll start.  I had two cans on the shelf, with nearly identical colors 
and labeling.  One was 'CRC Electronic Parts Cleaner' and one was 'CRC 
Electrical Parts Cleaner.' I don't remember if I misread the labels, or 
just didn't think there was a difference, but I grabbed the 'Electrical 
Parts' can and started spraying the guts of my speedometer.  Well, I 
took most of the paint off the odometer before I realized my gaff.  I 
finished cleaning the speedo with 'Electronic Parts' cleaner without 
mishap. Fortunately, Testor's makes a nice enamel with near-perfect 
match colors.  Listers, pay attention to your cans.

I've used '3M Adhesive Remover' on lots of things, esp. 3M adhesive 
(duh) and upholstery glue, and it's never removed paint. It's so good, 
you can't buy it in California any more.


On 3/5/2019 8:20 PM, Michael Salter wrote:
> Yes Tom, The paint on the face and inner rim is easily damaged and I 
> would recommend extreme care with any solvent.
> ( Don't ask me how I know :-( )
> M
> On Wed, Mar 6, 2019 at 5:13 PM Tom <ah3000me at gmail.com 
> <mailto:ah3000me at gmail.com>> wrote:
>     Michael, Mike, Steve,
>     Thanks for your comments!
>     Quick question...   can a solvent damage the face?    I think I'd
>     be better off damaging the glass than damaging the face.
>     - Tom
>     On Tue, Mar 5, 2019 at 7:42 PM BJ8Healeys <sbyers at ec.rr.com
>     <mailto:sbyers at ec.rr.com>> wrote:
>         I dribbled a solvent sparingly (acetone or 3M adhesive
>         remover, I forget which -- or maybe both) around the edges of
>         the glass.  Eventually the bond released.
>         Steve Byers
>         HBJ8L/36666
>         BJ8 Registry
>         AHCA Delegate at Large
>         Havelock, NC
>         *From:*Healeys [mailto:healeys-bounces at autox.team.net
>         <mailto:healeys-bounces at autox.team.net>] *On Behalf Of
>         *Michael Salter
>         *Sent:* Tuesday, March 05, 2019 3:48 PM
>         *To:* Tom
>         *Cc:* Healey Mail List
>         *Subject:* Re: [Healeys] BJ8 tach disassembly
>         Hi Tom,
>         What you have encountered is not uncommon. The manufacturers
>         seemed to use an adhesive of some sort to secure the rim and
>         the glass in position and it dries out and becomes very hard.
>         I would recommend putting the 2 small screws back in as the
>         mechanism does not have to come out at this stage.
>         You have to very gently pry the glass and inner rim, which is
>         under the glass to get it out.
>         You need to get a blade under the edge of the inner rim to
>         avoid chipping the glass.
>         As I recall there is a slot in the case that you can use as a
>         starting point.
>         Take your time and gently work away at it ... it will move
>         eventually.
>         M
>         On Wed, Mar 6, 2019 at 9:15 AM Tom <ah3000me at gmail.com
>         <mailto:ah3000me at gmail.com>> wrote:
>             Hi everyone,
>             I have some white dust inside the BJ8 tach that I'd like
>             to clean up.    I found disassembly instruction on John
>             Simm's site.  After removing the trim ring, and undoing
>             the two screws holding the mechanism to the case, the
>             glass face is firmly stuck to the case.
>             If I can pop the glass face off, I can easily clean it
>             with a can of compressed air.  But the glass face is
>             stuck, and I don't want to break something.  Anyone have
>             any ideas how to do this?
>             thanks again,
>             Tom
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