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On Apr 16, 8:02 am, gliderguynj wrote:
The annual for our C150F unfortunately presented us with a curve
ball.... We've posted this on the C150-152 forum, and are cross
posting this here hoping someone has some ideas, a part or a lead for
us to follow....

MA3SPA 10-4894 carburetor

Our mechanic called today. While completing the annual inspection he
removed the inlet screen and upon reinstallation found that the
threads are damaged beyond use in the carburetor body. He suspects
that over time people have been turning it a bit tighter each year to
achieve proper alignment with the hose (rather than adjusting the
other connections) and it has thus stripped the threads.

It is my understanding so far from my phone calls that this cannot be
repaired. There apparently is no approved method to repair or replace
the threads.

I am also finding that the carburetor is apparently hard to find also.
The overhaul shops I have called so far have none in stock and can
only rebuild the one we have...but can't because of the thread issue. It
is probably worthless as a core because of the damage. Spruce has them
backordered as they have been waiting for months to receive their
order.

Anyone out there have any brilliant ideas? Is there potentially some
way we can repair this? Anyone have any suggested overhaul shops or
parts suppliers for me to call to try to find one we can buy? Anyone
have an extra one they may be willing to part with?

Thanks in advance for your advice.

Doug and the Somerset Flying Club...

Precision Aeromotive, the manufacturers of that carb, have
sold the division to Tempest. FAA certification for the new owners
will take at least until November, so meanwhile parts are scarce. I
can't even buy a maintenance manual. Disgusting. This is government-
mandated safety, delayed by government.
There might be a shop with the appropriate helicoil tooling
to fix that port. Helicoils are used on many other aircraft
applications, including sparkplug holes and crankcase studs. Check
around.
And when they put that carb back on, tell them to READ THE
CONTINENTAL MANUAL before doing so. There are special lock-o-seal
washers on the intake spider studs that mechanics will either leave
off, or will tighten the nuts way too far, so that the spider can't
flex. Engine vibration then shakes the daylights out of the carb and
sloshes fuel out the bowl vent into the carb throat and the engine
runs rough, especially on acceleration. You can spend months looking
for the problem.

Dan

If it was on a homebuilt, I would be inclined to weld up the holes and then
just drill and tap tham again. On the 150, I just don't know and can only
suggest asking around. If there are any aircraft restorers in your area,
they may have a suggestion.

Peter