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HomeAircraftHelicopterMain Discussion › One bolt stripped in head align 91hp hope to save!
03-09-2018 02:54 PM  5 months agoPost 1
wifeorheli

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reno, nevada usa

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noticed a little fuel dripping from head of my 91hp. 1 of the 6 bolts in the engine block stripped. Used motor I think screw used was to small. Any chance of saving crank case? Sux over one head screw. Motor runs fine and doesn't lean but obviously loosing power. Any suggestions? Thanks

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03-09-2018 03:17 PM  5 months agoPost 2
JLF92677

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Southern California

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I believe the head bolts are 3mm. I would try tapping a new thread for 3.5mm bolt.

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03-09-2018 03:24 PM  5 months agoPost 3
Craig G.

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Central NC

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Look into a helicoil repair (no pun intended).

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03-09-2018 04:59 PM  5 months agoPost 4
helitom

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Pine Grove, Calif, USA

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Look in the classified section of the AMA rag. I'm pretty sure Clarence Lee still does helicoil repairs. Prolly in the $25 range.

The older I get, the fewer things seem worth waiting in line for.

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03-09-2018 05:26 PM  5 months agoPost 5
Dr.Ben

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Richmond, VA, USA

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Clarence does glow plug thread repairs. I can do it if you find no one willing to help you.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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03-09-2018 05:34 PM  5 months agoPost 6
TMoore

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Cookeville, TN

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The head bolts are 3.5mm. Get a 3.5mm tap, clean out the threads and get the right bolt. If it's really hosed, it needs to be helicoiled.

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03-09-2018 05:47 PM  5 months agoPost 7
w8qz

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Grand Rapids, MI - USA

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DIY approach:
https://www.mcmaster.com/#helicoils/=1bwb2h4

It's really not that hard to do, if you're comfortable with basic machine shop work. A helicoil repair requires that there's enough material around the hole to handle the drill and STI tap, and still have a reasonable wall thickness

"The helicopter is much easier to design than the aeroplane, but is worthless when done."

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03-09-2018 09:27 PM  5 months agoPost 8
JuanRodriguez

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The Villages, Florida

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Though I’ve used helicoils many times over the years, a good alternative in this case might be to go with the bigger bolt and re-tap the buggered up thread. Perhaps the next bigger dimensionally sized American thread might be appropriate......

Been there, done that and old enough to know better.....

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03-09-2018 10:17 PM  5 months agoPost 9
Professor Fate

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Goose Creek S.C.

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Here's an idea... just replace the crankcase.

Welcome my son, Welcome to the machine

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03-09-2018 10:51 PM  5 months agoPost 10
ICUR1-2

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Ottawa, Ontario

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JuanRodriguez
Though I’ve used helicoils many times over the years, a good alternative in this case might be to go with the bigger bolt and re-tap the buggered up thread. Perhaps the next bigger dimensionally sized American thread might be appropriate......
Definitely a better option.
Color the bolt so you remember which one goes where.

spending time, paying attention

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03-10-2018 12:45 AM  5 months agoPost 11
Jeff polisena

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westpalmbeachflorida usa

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Try longer bolt , sometimes there are more threads to bite at the bottom . . With head off put fresh bolt in stripped hole and see if there is clean threads at the bottom .

I stole it ,flew it and gave it back ;)

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03-10-2018 11:34 AM  5 months agoPost 12
Heli_Splatter

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USA

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I would go with retaping the hole with a step up in size. I just don’t think helicoil is the answer for this case. You might even get away with green or red locktight after clamping head down.

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03-10-2018 12:31 PM  5 months agoPost 13
mr dan

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Stockton Calif

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Geeze! A crank case is less than $120.00. You’re a grandrc pilot why don’t you just get a new one?

"R.I.P Roman" Citizen 0094 in the Nation

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03-10-2018 01:24 PM  5 months agoPost 14
JuanRodriguez

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The Villages, Florida

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mr dan
Geeze! A crank case is less than $120.00. You’re a grandrc pilot why don’t you just get a new one?
Because it's silly to spend $120 for something that can easily be repaired at a fraction of the cost.....

Been there, done that and old enough to know better.....

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03-10-2018 02:23 PM  5 months agoPost 15
mr dan

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Stockton Calif

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Sponsored pilots don’t pay retail

"R.I.P Roman" Citizen 0094 in the Nation

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03-10-2018 05:02 PM  5 months agoPost 16
JuanRodriguez

rrProfessor

The Villages, Florida

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mr dan
Sponsored pilots don’t pay retail
While you may not, many of us enjoy making such repairs as an extension of the hobby....specially such an easy repair....

Been there, done that and old enough to know better.....

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03-10-2018 06:36 PM  5 months agoPost 17
Jeff polisena

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westpalmbeachflorida usa

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I’ve seen people put paper clip in hole and put screw in and it holds . Hammer clip flat and thin and force head screw in . Get you some time out of it then buy new one .

I stole it ,flew it and gave it back ;)

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03-11-2018 09:39 AM  5 months agoPost 18
wifeorheli

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reno, nevada usa

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Mr dan yes I am but why buy a new one if I can fix this one?!

Novarossi Motors U.S.A
www.PLanethobby.com
Team GrandRc.com
Team Byron Fuels
ZRC U.S.A. "PushGlo, SwitchGlo"

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