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OS10 FP - 9/13/2012 7:11 PM   
AMB


 

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From: winter park, FL, USA
Status: offline 		Ok group i picked up a NIB OS 10 FP- ISSUE I cannot get out the phillips head head screws used WD 40 heated to no avail, do not want to take the chance of
of bugging the screw heads or really up the creek do have the Davis head and the socket head screws to get rid of the phillips ones
Ideas welcome martin

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RE: OS10 FP - 9/13/2012 7:21 PM   
Mr Cox



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From: Karlstad, SWEDEN
Status: offline 		You'll need a correct screw driver. It is not a regular philips one, but a japanese philips. That and some heat should do the trick.

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RE: OS10 FP - 9/13/2012 9:55 PM   
fiery


 

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From: Hervey Bay Queensland, AUSTRALIA
Status: offline 		Posi-Drive screwdriver of the correct size and a small propane torch to get some local heat on the head screws.

I borrow the small torch my lady has that she uses to caramelise the topping on dessert puddiings. When she is not looking

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RE: OS10 FP - 9/13/2012 10:11 PM   
earlwb


 

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Status: offline 		I would look for a set of Japanese JIS standard screwdrivers. OS uses the JIS standard and regular screw drivers won't fit the Philips head screws properly.  Now if the screws have buggered up heads or something, then what I do is place the engine in my milling machine with a cutting tool to fit in the hole and mill the heads off the offending screws. Then when I remove the head I can unscrew the remaining screw sticking out slightly above the crankcase top.  I have done that several times already to various engines.  A drill bit may work Ok too, I just didn't like the slight tapered bit of a hole leftover after the head is drilled off.


The two types of scvrew heads that one can encounter: You can see how a regular screwdriver won't fit in the cross slot on the JIS screw head.

JIS screw head


Regular Philips screw head





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RE: OS10 FP - 9/14/2012 1:09 AM   
Recycled Flyer


 

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quote:

ORIGINAL: earlwb

 A drill bit may work Ok too, I just didn't like the slight tapered bit of a hole leftover after the head is drilled off.



I have drilled out rusted head screws with a slightly under sized drill bit and find that the last wafer thin vestige tends to twist off just before head contact.

And its rare to find that the shaft of the screw bound into the case so just use some mulit grips to grip, twist and extract or dremel a slot across the shaft and screw out with a flat bladed driver normally.

Cheers.



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RE: OS10 FP - 9/14/2012 8:46 PM   
AMB


 

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From: winter park, FL, USA
Status: offline 		We got it a # 0 phillips driver filed for a perfect fit, there was one buggered screw, after taking out 3, head was loose and got out the chewed up one no sweat
the Davis Diesel head is now on secured by 3.5mm hex head socket screws
I did heat cycle in the oven twice last night and lots of WWD40 and let it set till today sure that helped too martin

correction screws are 2.5mm

< Message edited by AMB -- 9/17/2012 10:40 PM >

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RE: OS10 FP - 9/14/2012 10:26 PM   
AMB


 

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From: winter park, FL, USA
Status: offline 		OK Group Its up and running the minnie telemaster is the bench just remounted engine and tied down the plane. a few spins with the starter off it went on prime and stopped, kept opening needle till stayed running took 4 1/2 turns open, davis head compression 3/4 turn off bottom after starting opened an other turn for rich run stopped let it cool for a bit, when we first started WOT 8400 the 8500 now 9000 only about 10 minutes so far prop 9 x 4 wood zinger it was NIB never saw glow fuel we have an other one from Dennis a few hours on it great shape will mount the Davis head as soon as I pick up from 3.5mm hex head screws so we now have 2 OS10 FP max to join the OS LA 10 Davis head.an other tank or two and will be able to lean and increase compression martin
fuel was Davis 1/2A

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RE: OS10 FP - 9/27/2012 11:29 PM   
AMB


 

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From: winter park, FL, USA
Status: offline 		OK ALL.. trying get the 3rd one up and running have a new p/l looking around to see if I can find a "junker" all I need are the teflon discs that plug into the end of the wrist pin case, shaft, carb muffler all good have a new gasket set and screws , do have the Davis head martin

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RE: OS10 FP - 9/28/2012 12:32 AM   
AMB


 

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From: winter park, FL, USA
Status: offline 		if all else fails will see if i can get some 1/4 inch teflon rod if it exists put a piece in my drill press and work with some jewelers files , worth a try

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