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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › O.S. 105 HZR stripped motor head bolts
01-31-2013 10:46 AM  5 years agoPost 1
P Andreoli

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new york

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-hey everyone i was changing out the piston sleeve and liner in one of my 105s and two of the 6 bolts stripped. For the last few days i have not been able to find a replacement set for the motor, does anyone know where i can?

thanks,
Paul

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01-31-2013 08:55 PM  5 years agoPost 2
lightningrc

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UK

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Would imagine its pulled the ally threads in case out also .
You may get away with using 6 slightly longer bolts , bolt size is comman available all over the net or local hardware stores .
Make sure to use black bolts though as the silver ones are not has strong unless there stainless silver ones .

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01-31-2013 10:42 PM  5 years agoPost 3
Four Stroker

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Atlanta

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He probably means the hex head. OS bolts are soft you won't trash the cylinder. http://www.mcmaster.com

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02-02-2013 10:44 PM  5 years agoPost 4
jwatts007

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England

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I have 2 90hz engines here...stripped 4 heads on one and 3 on another...I have been meaning to drill them out for months now the OS hex heads are not very good.....

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02-03-2013 03:37 AM  5 years agoPost 5
TMoore

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Cookeville, TN

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If you use decent tools y'all wont round out the hex.

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02-03-2013 07:10 AM  5 years agoPost 6
jwatts007

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England

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You do have a point...I have been using the same driver for a couple of years now and have been meaning too grind a few mill off the end.....

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02-03-2013 12:07 PM  5 years agoPost 7
P Andreoli

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new york

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you guys do have a point Better tools=less headaches

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02-21-2013 02:45 PM  5 years agoPost 8
beavis1

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New York state

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I remember telling some one that
I think I get to say told you so officially right

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02-21-2013 04:45 PM  5 years agoPost 9
ticedoff8

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Morgan Hill, CA. USA

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You actually stripped the threads off the bolt?
That's wild!

Or, as the others suggested, you "rounded out" the inside of the hex-head on top?

I would think it you simply rounded out the inside of the hex-head, then it should be as simple as going to the LHS and buying some decent replacements.
On the OS & YS engines, they are 3mm x 35mm hex-head screws. They do not take a lot of stress, so you shouldn't have to get some fancy high strength special socket-head screw.

If your 3mm hex driver is in decent shape, your shouldn't be rounding out the hex-head.

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02-21-2013 10:36 PM  5 years agoPost 10
helidevil

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Brunswick, ME

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It's all that wrestling working out kicking in, right Paul?

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02-24-2013 09:07 PM  5 years agoPost 11
P Andreoli

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new york

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hahahahahaha XD

yah that's it Devin! lol

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02-25-2013 12:11 PM  5 years agoPost 12
helidevil

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Brunswick, ME

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nailed it.

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02-25-2013 09:07 PM  5 years agoPost 13
CoronaL

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Winnebago IL

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I get replacements locally from "Fastenal"(?sp?). Get a bag of 100 of the screws/bolts for about $10-15 from what I recall.

I replace them after 1-2 uses as they do tend to strip and head bolts on cars anyway are torque to yield, and while these are not the same, at least to my knowledge. What i prefer to do, is heat up the motor/head and bolts on re-assembly and as the parts cool they get tighter. That way if they are tight when hot, they shouldn't get loose as some head bolts/screws are prone to. I worry that cycling the bolts too many times like that could weaken them, so I dispose of them after a couple uses.

Randy!!! I am the liquor

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