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The troublesome Corsair engine, the gruesome twosome, another Hero Testors McCoy .049 and the yellow prop returns.   - Page 2 Cox_ba12




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Post  balogh Tue Jul 23, 2019 1:17 am

I have fiddled with quite a lot of COX engines and found that if stubbornly refusing to start -and the glow head, compression and reed valve are ok and carb is clean - the loose fit of crankshaft  in the crankcase is a very likely problem that simply kills fuel draw and charge capabilities of the engine. Elongated use by previous owners with unbalanced props typically leads to this problem. In such instances the radial play of the shaft is already manually sensible.

You may want to check it as this will lead to symptoms similar to the untight gasket on the crankcase back.

P.S.: I just saw that Oldenginerod had suggested the same checking of the crank to case fit..sorry for my repetition
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Post  rsv1cox Tue Jul 23, 2019 7:42 am

@balogh wrote:I have fiddled with quite a lot of COX engines and found that if stubbornly refusing to start -and the glow head, compression and reed valve are ok and carb is clean - the loose fit of crankshaft  in the crankcase is a very likely problem that simply kills fuel draw and charge capabilities of the engine. Elongated use by previous owners with unbalanced props typically leads to this problem. In such instances the radial play of the shaft is already manually sensible.

You may want to check it as this will lead to symptoms similar to the untight gasket on the crankcase back.

P.S.: I just saw that Oldenginerod had suggested the same checking of the crank to case fit..sorry for my repetition

But, it runs fine with the attached 5cc tank. Of course the fuel supply is right there and doesn't have to be drawn from a remote source.

It's Ron's problem now. Smile
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Post  getback Tue Jul 23, 2019 3:59 pm

Well that just tells you right there You said it ,, If it runs with a tank on it it the backplate/gasket !?!? Very Happy Hey Bob you getting any this rain and 69* weather ? .> nice here But wet!! Very Happy
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Post  rsv1cox Tue Jul 23, 2019 4:43 pm

@getback wrote:Well that just tells you right there You said it ,, If it runs with a tank on it it the backplate/gasket !?!? Very Happy  Hey Bob you getting any this rain and 69* weather ? .> nice here But wet!!  Very Happy

I have tried it with no gasket, gasket between the case and the reed retainer, and the gasket on the back side of the retainer, no difference. Would not run.

Mailed it to Ron this afternoon.


A little cooler here today, cloudy and rain this morning, sunshine this afternoon. Cloudy now. Still humid. Corn is tasseled.

Bob



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Post  rex f. Thu Jul 25, 2019 4:55 am

Seems you have tried most options put a killer bee backplate or surestart
Will do your problem will be solved  the black backplates are well known
To shrink & crack ( with  ) agethe crack will extend from the compression
Side or the n/v spraybar assy to the reed seat almost invisible but opens
When tiightened hence your insurmountable problem  thumb over the
Intake & blow or suck  always seems ok have seen this twice
    Good luck rex   or send it to me (postage would cost ) however i can
Fixit   rexf.
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