Simon,
The throttle switch allows power to flow thru it when the points are
closed. If overdrive switch is shut off no power will flow thru the
throttle switch unless the relay has been engaged. At one fifth
throttle the cam turns and opens the points disengaging power to the
overdrive as long as the switch is not supplying the power to the relay.
The slot on the shaft is parallel to the flat on the cam. With the
throttle in idle position set the slot vertical and tighten the lever.
The list will lose the figure and OD circuit photo's but it should be
helpful to you. I have also included a file of the OD circuit for
reference as well.
Don
57' BN4
-----Original Message-----
From: owner-healeys@Autox.Team.Net [mailto:owner-healeys@Autox.Team.Net]
On Behalf Of Simon Lachlan
Sent: Friday, January 19, 2007 9:53 AM
To: 'Healey List'
Subject: Annaul overdrive snafu
Hi,
Overdrive continues to drive me mad.
Symptoms remain as previously reported:-
I can hear solenoid as soon as I depress throttle and again when I lift
off.
Relay bench tests OK.
Solenoid clunks nicely and od engages OK on road.
Wiring has not been tampered with and looks fine. In-line fuse not
blowing.
Switch on dash is OK.
3rd/4th switch seems OK.checks out per manual and I can hear od
engaging/disengaging as I move gear lever.
Actual od unit is fine and has plenty of the correct clean oil. (We
won't
discuss which is the preferred oil.)
Suspect continues to be throttle switch, but I've been down that alley
before. Whenever I blame that switch it turns out to be something else.
If I take the b****y throttle switch apart, it looks OK and it seems to
function OK. But I would say that it's maybe a bit quick to
engage/disengage. That's to say that the slightest movement of the lever
breaks the continuity. It seems a bit trigger happy to me. What are the
nuts
and bolts symptoms of a dead throttle switch? Which bit gives up where
leading to what happening where?
Don't want to resort to my wallet and throw bits at this thing until it
goes away. Done that in the past and it a)costs a lot & b) does not
teach me
what went wrong and ghow to be alert for it in the future.
Simon.
[demime 1.01d removed an attachment of type image/jpeg which had a name of OD
Circuit.jpg]
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