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larry(at)macsmachine.com
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 Posted: Mon Apr 10, 2006 8:35 am Post subject: Bing Carb Type 64 adjustments INNOCENT GLOBAL 0.0000 1.0000 |
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Hi guys,
The necessity of changing jets can be a stress raiser if you've not done
it before, but I've made most of the mistakes and can finally comment
that theres little to worry about, but there are a few things that make
the job safer and easier for Bing Type 64 carburetors.
Disassembly can be done right on the engine and should not be a problem
with the Stratus Subaru setup. Fuel valves should be shut off. You do
need a Bing Manual the first time or so as it offers very specific
guidance on everything.
Air filters are removed and the intake tube opening covered with a shop
rag to prevent dropping anything into the intake. Then the throttle
cables and enrichment (choke) cable lugs need to be disconnected.
Rotating the enrichment lever against the spring allows removing the lug
and cable. The throttle cable bracket is disconnected at one end to
allow it to be pivoted from over the enrichment return spring. The
spring is disconnected and set aside. Two large Phillips top cover
screws are removed. Anything that would prevent lifting the cover
vertically a couple of inches should be removed.
The throttle is closed to prevent anything from dropping into the
intake. The cap, jet needle housing, diaphragm and large spring are
lifted off and rotated out of the way. The large spring and jet needle
housing is set aside. Note the jet protruding inside the bottom of the
carburetor body.
The jet needle is accessible only after a large blade screwdriver is
used to unscrew the threaded retainer from within the topside of the
tube. Using too small a screwdriver can easily damage the retainer slot
and make it non removable, so grind a large one down to fit inside the
tube if necessary. Remove the needle and adjust the circlip as
necessary. Note the jet needle identity size by counting the rings, not
the notches for the circlip.
The lower fuel float reservoir spring is pivoted to the rear and up
enough to allow the reservoir and floats to be lowered, removed and set
aside.
Before removing the main jet and mid-range jets, take a 6-inch piece of
.020 stainless safety wire and insert it down thru the opening of the
jets allowing 2-inches to protrude out the bottom. Bend the wire to
prevent loosing the small jets as they are removed. The main jet is
removed first. Take note of the size of the main jet and set it aside.
The mid-range jet is removed second and all successive parts are removed
on the wire to keep them from dropping out of sight. Sizes are only
found stamped on the main and mid-range jets. Make changes as needed and
take note of the arrangement of the jets shown on the Bing exploded view
to be sure that the jets are reassembled in proper order.
For reverse assembly, be careful to not stub the jet body end going back
into the carburetor body. Be careful to not damage the reservoir gasket
on reassembly. Be careful about alignment of the diaphragm key,
alignment of the jet needle, the enrichment lug, and final throttle
cable position etc.
Small wrenches used to remove the jets and throttle nuts are 8mm, 9mm
and 10mm combination open and closed end. These are easily purchased as
a set of small ignition wrenches in a plastic envelope from Sears. If
you do drop a 10mm nut into the intake as I did once, you can remove it
with a high-powered vacuum sweeper by opening the intake valves one side
at a time with the spark plug removed while rotating the engine slowly
by hand. Just dont make that mistake!
Have a good day.
Larry McFarland - 601HDS at www.macsmachine.com
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frank.hinde(at)hp.com
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