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Engine shafts?for Jett 56

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Old 05-27-2011, 02:44 AM
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richardgerardi
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Default Engine shafts?for Jett 56

I just got the 56 Jett. I was installing a spinner and noticed that the shaft came loose. I also noticed that there was a second one in the bag which is longer. The question is is the normal for it to come loose and how do you tighten it? Thanks
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Old 05-31-2011, 06:56 PM
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Default RE: Engine shafts?for Jett 56

You typically thread them in until they stop and then back it out a turn. Install the prop and tighten. This way, if there is a crash and the threaded stud breaks off you can simply remove what's left and install a new one.
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Old 06-07-2011, 06:55 PM
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Default RE: Engine shafts?for Jett 56

Thanks for helping.

Yes, install it loose. Thread it in a minimum of 3/8", but do not bottom it out. You can use this as an adjustment if needed for spinner/prop fit.

If you tighten it, the threaded stud can get askew slightly you will not see it, but the prop might mis-align. You want the prop stud to float in the threads a bit, and the prop will square up properly on the drive washer.

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Old 06-08-2011, 10:38 AM
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MJD
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Default RE: Engine shafts?for Jett 56

Bob,

Not to hijack a thread, but I have a related question - on my SJ .50 and on a couple of my OPS engines with prop studs, I cut a small (1/16") washer of silicone fuel tubing and drop this into the crank before threading in the prop stud. My thinking - perhaps misguided - is that this would give me a soft stop for the stud and be a good indicator that I had threaded it in good and far but not too far. I screw the stud up to the silicone but only until it touches with light finger pressure. It is enough of a stop that the friction of the prop nut won't tighten it any further.

Is there any logic to this? Bad/good idea?

MJD
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Old 06-11-2011, 11:38 AM
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Default RE: Engine shafts?for Jett 56

Sounds like a reasonable proceedure.
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