----- Original Message -----
From: davidwjones
To: Simon Lachlan
Sent: Monday, June 13, 2005 12:10 PM
Subject: Re: Rev counter query.
Simon,
Any differences in average speed, ambient temp, prevailing wind?? How much
difference do you think there was in mpg? Your trip wasn't up into the
mountains, and then back, was it? LOL
Once the ticking started, was the tach still working? Have you checked that
the cable is not broken internally? That the internal (square) cable ends are
intact? Have you checked that the cable is not binding in the sheath? Have you
checked that the receptacle for the tach cable in the gauge is nor recessed or
"rounded out"?
I've had all of the gauges apart, and despite the fact that I worked on minute
lab instrumentation products for years, there's not a lot that can be done,
without parts, or unless something has loosened up and come apart. They can be
cleaned and lubed with a light instrument lube, but generally, that is about
it. ---And the instrument face should never be touched, or allowed to come in
contact with cleaners / lubricants, or liquid of any kind. -If the problem is
the gauge itself, you'd probably be best sending it out.
David W. Jones
'62 Mk II BT7 tricarb
Cumberland, RI USA
----- Original Message -----
From: Simon Lachlan
To: healeys@autox.team.net
Sent: Monday, June 13, 2005 11:15 AM
Subject: Rev counter query.
Hi,
I've just come back from a longish trip in my MkII BT7, 500 miles approx.
No
real issues arising except how amazed I was at how much less fuel I used on
the return trip with hood up and using higher octane fuel. BIG difference.
Obviously a combination of RON & wind resistance, but does the panel think
it would be more one than the other and if so which???
Now, the main topic. .after the first 200 miles or at the first set of
lights (when I could hear something), I noticed a loudish "Tick, tick"
noise
form the front/dash. I established that the rev counter was not working
and,
by holding the cable, I could feel it "pulse(?)" in time to the noise. So
noise, cable & rev counting are linked.
I surmise that the cable must still be rotating, hence the drive coming out
of the distributor is OK.
I presume that the instrument is possibly u.s. (Functioning OK before, no
period of apparent decline).
I suppose I'll have to take instrument out and start from there???
So, are there any immediate fixes/issues that arise from these symptoms??
(Like, for example, intermittent click from fuel pump and good wallop on
bulkhead means pump's points are up the spout.)
I haven't done anything yet except take out the cable to prevent it making
things worse.
Is a rev counter something that one can fix at home?
Simon.
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