OS engine MAX-46AX - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-17-2010, 07:38 PM   #1
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OS engine MAX-46AX

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This relate to an engine with approximately 30 hours of running time.
The main rear bearing gave up after losing one ball bearing, it
came out of the engine without damage to piston and cylinder sleeve.
Since it had to be taken apart, both crank bearings were replaced
with quality bearings.
It ran better than before with higher RPMs. But had problems with
it like throwing props due to hydraulic locks, engine running lean also.
It all boil down to the Mixture Control Valve. After many frustrated
attempts, it was decided to put this engine on a test stand and figure
out what the fuel problem was all about. It was noticed that the fuel
mixture control valve needle was lose in its thread.....and it will turn....
all to say trouble again....Is it poor quality from lose thread? It will not
remain firm, also poor quality bearings? they should last longer.
That engine is remarkable it runs very fast 12000 rpm with a 12x5 prop
on 15% juice. But, with that weird fuel mixture control valve not propÍrly
adjusted it can get really mean and throw a prop a you.

They make them more efficient but is the durability still there?

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Old 09-17-2010, 08:13 PM   #2
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Re: OS engine MAX-46AX

A few questions regarding the mixture and bearings:

What is the condition of the O-ring?

Same question on the tang?

Was there any signs of corrosion on the bearings or races?

Bearings obviously need oil, so I wonder if yours grenading like that came about from a lean running condition.
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Old 09-17-2010, 08:20 PM   #3
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Re: OS engine MAX-46AX

Having a loose needle in an O.S. made carb is not common at all.

I base that on running probably 40+ of them.

If the needle is moving during running - something's up.

Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 09-18-2010, 08:13 AM   #4
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Re: OS engine MAX-46AX

Also- how is the engine mounted on the plane? Right side up? sideways? Inverted?

Inverted engines have a greater tendency to hydro-lock. You can also lock up an engine right side up if too much fuel pools in the crankcase.
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Old 09-18-2010, 04:29 PM   #5
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Re: OS engine MAX-46AX

I do thank all of you for your suggestions and questions.
I like OS engines and have had many. The O ring on the
carb seat is fine. It is the low idle very small needle that
is lose....the one in the carb itself....not the remote hi
speed needle. Have no trouble with that one. It is a very
powerful engine......At one time while revving around
7k or so in flight, the engine just stopped. Very easy to flood.
It is my first engine with a rear mounted hi speed needle.
It is mounted sideways on a model and did most all my tests
with engine upright on a test stand.
It is running great now...but there is a slight wooble where it screws inwith
the low speed needle.
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