[Healeys] Carb tsunami

BJ8Healeys sbyers at ec.rr.com
Tue May 16 18:02:31 MDT 2017

If this works as intended, my comments are inserted in red font.


Steve Byers


BJ8 Registry

AHCA Delegate at Large

Havelock, NC USA


From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of ph
Sent: Tuesday, May 16, 2017 6:06 PM
To: healeys at autox.team.net
Subject: [Healeys] Carb tsunami


We are working on my early phase 2 BJ8. Very standard car.very standard fuel
pump and system.

So, we've noticed that petrol was initially seeping out of the front carb,
HD8. Then the seepage seemed to get worse, almost as we looked at it. The
leak is on the front carb and the fuel seems- it's not easy to be sure-  it
seems to be coming out from where the choke cable hits the lever. Given
sufficient time and particularly a few attempts to start the car, then the
fuel comes out of the manifold overflow pipe. Plenty of it too.  The
diaphragm is probably cracked and leaking.  If you are going to change one,
you may as well change both of them.

Some observations:-

1) both of the floats are good. 100%.  If the floats spring a leak, they
will fill up with fuel and sink to the bottom of the float chamber.  Then
you will have fuel coming out of the overflow pipes.

2) no fuel at all ever comes out of the float chamber overflow pipes  This
only happens if the needle valve does not shut off the flow of fuel into the
float chamber, which can happen if the needle valve leaks, or the float
sinks to the bottom of the float chamber.

3) the connections at the banjos are sound.no leaks there

4) the jets??I don't know, are they Grose? They are kind of octagonal in
their long profile. They have a little spring inside, with traditional cone
shape at the top and little short, spring loaded, needle sticking out of the
bottom. One of these things appears to be white nylon/plastic plus brass and
the other appears to be some low grade silver coloured alloy. Both springs
appear to be functional and both jets can entirely stop fuel coming out. (ie
when I close them/push them home by hand). But we know nothing of these
things. Never seen one before.  What you describe is the typical
nylon-tipped needle to shut off fuel flow to the carbs.  They are not Grose
Jets, which have balls to shut off the flow. 

5) Not withstanding my suspicions of these seemingly complex little jets, we
think they are correctly setup. They are not dropping so far that they can
jam. No, we think that the jets are probably, note probably!!, OK.  The jets
of the carbs are the brass gizmos that the needle attached to the big piston
fits into.  What you are referring to is the port in the float chamber cap
that the needle valve closes off to shut off the flow of fuel into the float

6) My uncle, who is over from England, is more used to HS4s and Webers but
he is wondering if the problem could be from the diaphragm. If it splits,
that's it, right? Fuel in the manifold, fuel on the floor??   I think your
problem is a split/cracked diaphragm.


We'd really appreciate your accumulated wisdom. If we're to get the parts
over from the UK, we've got to order them yesterday!!




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