Today's Message Index:
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1. 07:54 PM - Engine Weight Comparison - Jabiru 3300 To Rotax 912 ULS (david van lanen)
2. 09:32 PM - STUCK PROP FLANGE BOLT- HELP ME PLEASE (MHerder)
Message 1
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| Subject: | Engine Weight Comparison - Jabiru 3300 To Rotax 912 |
ULS
Has anyone compared the installed "wet" weight of a Jabiru 3300 to a Rotax
912 ULS, and if so, can you give me an approximate weight difference?
Thanks,
Dave Van Lanen
Madison, WI
Message 2
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| Subject: | STUCK PROP FLANGE BOLT- HELP ME PLEASE |
Guys I'm having a really crappy night.
This evening I decided to prepare for the final installation of my 2.5" prop hub
extension on my 3300. In strict accordance with the service bulletins I heated
the flange and bolts while protecting the rubber seals with a wet rag and
I safely removed all six bolts. SUCCESS... I thought.
I thouroghly removed all of the loctite with a dental pick, then acetone on the
female side. I then used a steel brush and cleaned the female threads. I then
cleaned the bolts with a wire brush on a wheel. Acetone 3 or four more times,
cleaning very thuroghtly, making sure not to get oils from my hands on the
bolts. Cleaning, blowing with compressed air, acetone repeat... Maybe even
too many times, but I was determined to not screw this up!!!.
As a final check I decided to make sure that all was well and hand screwed the
bolt in to make sure that it went in smoothly. I used the same bolt on three
holes and it went in pretty dang smooth. The third one was nearly all the way
in (about 1/8" less than all the way in (simulating prop flange thickness))
and then it got stuck!! I thought surely it can't really be stuck, I'm not cross
threaded and it went in smooth. So I got out my wrench to back it out. Now
it's stuck enough that it turns over the engine and I don't have the prop flange
on so it's tricky to keep the engine from turning over.
I only have two theories as to how this could have happened.
1) A little bit of steel from my brush has lodged itself in between the threads???
2) The cleaning action of my steel brush rounded off the threads a bit and is
causing an extremely tight fit?
3) The loctite 620 that I thought was completely cleaned off was actually still
there in a residual form and the acetone that I thought was dry was still a
little wet and reactivated the 620?? This one is a long shot. As I really cleaned
these puppies.
I need help and worst case scenarios here. I am going to have nightmares about
having to replace a crankshaft on account of this.
What would a good machinist do to get this thing out?
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One Rivet at a Time!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=288699#288699
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