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Thread: HA-6 carb problem

  1. #1

    HA-6 carb problem

    My friend was going to fly my 1975 C23 while I was out of town. My
    son said he came taxiing back with black smoke coming out of the
    exhaust.

    15S was due for an Annual the next day anyway. With the boost pump
    on, fuel was running out of the air box. I pulled the carb (no easy
    trick) and found the nearly see-thru white plastic float had
    partially filled up with fuel.

    I have not flown the plane in a while, but those that did never
    squawked a rough idle. It seemed to happen all at once.

    I turned the float every which way and couldn't get the fuel to leak
    out. It might take temperature changes to accomplish that.

    I called Precision Airmotive since the carb had around 100 hours
    since overhaul, unfortunately that 100 hours came in the very last
    part of the 5 years since overhaul (15S was bought as a basket case
    after a bent nose strut and prop strike) I am an A&P. I.A.

    I have a Precision dealer near me, Precision said they would cover
    the float, but I'd have to pay the dealer to install it. I inquired
    about just getting the part and installing it myself, they said it
    was the dealer's call. If the dealer wouldn't do it i can send my
    float to Precision and they'll send me a new one, gratis.

    They said ther was a very small percentage of floats gone bad. Keep
    this in mind if your idle turns rich.

    They seem to be a very customer oriented company and have a lot of
    free information on their web site.

    I will try to post a picture of the fuel logged float in the photos
    section.






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  2. #2

    HA-6 carb problem

    >My friend was going to fly my 1975 C23 while I was out of town. My
    >son said he came taxiing back with black smoke coming out of the
    >exhaust.

    HA-6 are well known for running rich, especially on the ground, but
    obviously this is more than the usual problem.

    >15S was due for an Annual the next day anyway. With the boost pump
    >on, fuel was running out of the air box. I pulled the carb (no easy
    >trick) and found the nearly see-thru white plastic float had
    >partially filled up with fuel.

    The "Poly Float" is the current idea to solve previous float
    problems. Cars when through this about 20 years ago, and there was a rash
    of sunk floats in the 80's before everything went Fuel Injection.

    >I have not flown the plane in a while, but those that did never
    >squawked a rough idle. It seemed to happen all at once.

    This is quite common. Runs good one day, won't run at all the
    next. Doesn't seem to be any rhyme or reason to the float sinking.

    >I turned the float every which way and couldn't get the fuel to leak
    >out. It might take temperature changes to accomplish that.

    Yes, it will dry out if you leave it sitting in fresh air for a day or
    two. I've known mechanics that reused ones that had previously sunk with
    mixed results. I always tried to find a brass replacement.

    Over the years we've seen them go from brass to black foam composite, back
    to brass, and now the white poly float. I think that for long term
    service, a well maintained brass float is better, but they are getting hard
    to find. Kelly Aerospace/Consolidated Fuel Systems used to manufacture a
    PMA brass float, and I've used many of them.

    >I called Precision Airmotive since the carb had around 100 hours
    >since overhaul, unfortunately that 100 hours came in the very last
    >part of the 5 years since overhaul (15S was bought as a basket case
    >after a bent nose strut and prop strike) I am an A&P. I.A.
    >
    >I have a Precision dealer near me, Precision said they would cover
    >the float, but I'd have to pay the dealer to install it. I inquired
    >about just getting the part and installing it myself, they said it
    >was the dealer's call. If the dealer wouldn't do it i can send my
    >float to Precision and they'll send me a new one, gratis.

    I've had good results dealing with Precision and their agents. They gave
    away free venturis after the 1 piece venturi AD came out, and they have
    been helpful with tech support.

    >They said ther was a very small percentage of floats gone bad. Keep
    >this in mind if your idle turns rich.

    Its very critical that the HA-6 carburetor have the float level set exactly
    correct. Even a few thousandths of an inch too high and the carburetor
    will be nearly unusable from running over rich.

    A note to those that might be putting a poly float in where a brass one was
    used previously, you will almost certainly have to change the shim washer
    under the brass needle seat to be able to set the float level
    correctly. The poly float is thicker and needs a thinner shim under the
    seat to properly install it. Can be really aggravating if you have to mail
    order the shim after waiting for the float!

    Bob Steward, A&P IA
    Birmingham, AL




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