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General control line discussion => Open Forum => Topic started by: Elwyn Aud on January 29, 2009, 04:08:02 PM
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What is the size of the back-plate bolts on the old Fox 15?
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Just shooting a best guess... 3-48? From what I've seen when Fox uses something smaller then 4-40 it's usually 3-48.
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Andrew is right Elwyn. If it is an old steel fin, or the later slant plug, it is 3-48. I just checked mine. I think the head bolts are 3-48 also, but who can get those little buggers out with their little bitty phillips heads all stripped out. You might have to go to McMaster Carr to get them as 3-48's are scarce as hens teeth anymore.
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the size is a odd ball phillips that strip very easy LL~ LL~ LL~ LL~ LL~ LL~ LL~ LL~ LL~ LL~
Sorry Elwyn I couldn't resist but I will be doing the same on the head of a 36x
Tom
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Elwyn;
Yes 3-48 is the size. I get mine from Ro Brand. I believe you can get them from Fasten All to.
"Billy G"
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Elwyn,
I just looked at microfasteners.com they have 3-48 various Lengths in stock. you can order in qty. of 10 or fifty I buy all my bolts from them. I have not experienced any problems with their products.
Tom
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How many do you need, Elwyn?
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4
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Are you coming out to the field on saturday or sunday?
I can bring you 4 of them then.
Do you need gaskets?
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Hope to get out Saturday. The gaskets are still good.
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See you saturday.
Bring the engines!
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Hope to get out Saturday. The gaskets are still good.
Elwyn,
It's usually better to replace the gaskets if you take the engine apart. Old fibre , paper, cork, gaskets
usually are compressed when used and don't as well if reused, The correct screwdriver is I believe a #1 phillips.Duke used to sell screwdrivers for his engines to deal with the complaints of stripped heads on the screws.
dennis
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This sure doesn't look right. I was going through a few Fox 15's the other day and noticed 2 of them had an exceptionally small inlet hole on the needle valve assembly. One of the 15's was an older one with a pressed in needle valve assembly and the other was a later model with a screwed in nva. I don't think I've ever ran the ones with the small inlet hole but it sure looks incorrect. Here's a picture with normal looking inlet hole with one of the smaller holes.
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I've got a couple of both... I just assumed Fox machined them differently at some point.
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This sure doesn't look right. I was going through a few Fox 15's the other day and noticed 2 of them had an exceptionally small inlet hole on the needle valve assembly. One of the 15's was an older one with a pressed in needle valve assembly and the other was a later model with a screwed in nva. I don't think I've ever ran the ones with the small inlet hole but it sure looks incorrect. Here's a picture with normal looking inlet hole with one of the smaller holes.
I think the small hole was special for the Fox15 hurl contest---it keeps the dirt clods out of the spraybar and the small hole doesn't interfere with the aerodynamics of a spinning Fox.
Actually it looks like they forgot a step in the machining process. That small hole represents the seating diameter, where the needle pokes through. Normally you would open up the hole on the fuel tube side. I know that because I made a few $100 spraybars with my mini lathe. y1