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HomeAircraftHelicopterHelicopter Main Discussion › Is there anyway to repair this?
11-19-2018 03:08 PM  22 days agoPost 1
motorrc

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canton ohio usa

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Is there anyway to repair this muffler attachment point other than to replace the entire crankcase?

if it doesn't fit, make it fit.

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11-19-2018 03:19 PM  22 days agoPost 2
banshee rider

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Phoenix AZ.

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Local welding shop maybe

ageing is manditory maturity is optional

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11-19-2018 04:23 PM  22 days agoPost 3
Jeff polisena

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westpalmbeachflorida usa

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I’ve seen bolt holes drilled thru case and JB weld to get flush mating service

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

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11-19-2018 04:30 PM  22 days agoPost 4
Dr.Ben

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Richmond, VA, USA

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Not an option with a YS. Through drilling would go through the 'case wall.

I understand why guys like hard mount pipes. This is why I never did.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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11-19-2018 05:21 PM  22 days agoPost 5
RM3

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Killeen, Texas - USA

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a pro with a TIG aluminum welder should be able to fill it... but you'll need to re-drill and retap the hole...

given what good welding shops charge, to include the charge for machine work if you have them do it... it will be much cheaper to buy a new case.

showing a preference will only get you into trouble, 90% of everything is crap...

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11-19-2018 07:19 PM  22 days agoPost 6
Heli_Splatter

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USA

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Keep in mind, if you go the repair route, the repair is very likely to break again at the original point. The YS engines that I looked at seem to be $150-$200 for the engine case. Not much machine work can be purchased for that. I think that replacement is the sound way forward.

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11-19-2018 08:10 PM  22 days agoPost 7
Gearhead

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Vt

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don't forget you have to reface the flange so the muffler will seal, and what if you pay to have it welded and then you find another problem like the case warped a bit, I say replace the case, even if you have to buy a used case

Jim
Buzz Buzz Buzz

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11-20-2018 12:30 AM  21 days agoPost 8
JuanRodriguez

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The Villages, Florida

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You may be able to find a "parts" motor cheap so then you can harvest the crankcase from it........

Going the welding repair job is a waste of time.....

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

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11-20-2018 12:35 AM  21 days agoPost 9
TMoore

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Cookeville, TN

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I've been Tig welding for years and this is an exercise in futility.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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11-20-2018 12:44 AM  21 days agoPost 10
utahbob

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St. George Utah

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Yeah..I have to agree..welding aluminum that's been exposed to oil/fuel is next to impossible.

I do a great decending funnel!

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11-20-2018 12:13 PM  21 days agoPost 11
JerBear

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Mesa, AZ

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You could try cleaning it really good with acetone. Then turn the bolt hole into a "stud". Use a bolt with long threads. Put the bolt in the hole as best as possible and if possible, use the muffler flange to keep it straight. And if you can, get someone to weld the bolt in the case. Then cut off the bolt to the length you need to fit through the muffler flange and just use a nut to secure that side. I'd also use a thin piece of metal to make a spacer between the exhaust flange and the muffler flange and JB Weld it to the exhaust flange to help secure the new stud a little more.

Jeremy

I don't suffer from insanity, I enjoy every minute of it.

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11-20-2018 03:33 PM  21 days agoPost 12
Heli_Splatter

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USA

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Sorry but "welding" mismatched metals?? Steel and Aluminum. That does not seem to be the way to go. Fix it right, buy the parts. Most answers agree with that. Warping the case is a high probability.

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11-20-2018 04:04 PM  21 days agoPost 13
wjvail

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Meridian, Mississippi

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For me, a large part of this hobby is having good looking models. Any repair to a broken crankcase would likely result in a solution that is not attractive enough - for me.

Please note, there is no judgment against those that make other choices. I have flown with folks over the years that would be more than content to repair that with a "goiter" of JB weld. My impression is that they enjoy their models as much or more than I do.

Me, I'd buy a new case. It's the cost of doing business.

"Well, nothing bad can happen now."

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11-21-2018 09:03 AM  20 days agoPost 14
InvertedDude

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USA

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motorrc
Is that a YS 91 ST? I got a few good crankcases.

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11-25-2018 01:56 PM  16 days agoPost 15
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

In a place with a plenty of resources, I couldn't agree more. Soldering and epoxy solutions on motors are a waste of money and time.

I don't like "Frankenstein" helicopter flying around the yard, tough ...

/

Saludos cordiales,

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11-25-2018 03:18 PM  16 days agoPost 16
InvertedDude

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USA

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Crankcase
YS91ST crankcase on the way!

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11-29-2018 05:22 PM  12 days agoPost 17
Andy from Sandy

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Bedfordshire, UK

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I have seen a break like that in just the mounting hole fixed with JB Weld. That was on an OS105 and it held up no problem.

The guy said it was a bit tricky to start with as the JB Weld was a bit runny.

EDIT: I can see why it would work with OS as the screws go all the way through and are not screwed into the case. Yes it looks a new case is the way.

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11-29-2018 08:47 PM  12 days agoPost 18
JuanRodriguez

rrProfessor

The Villages, Florida

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Andy from Sandy
EDIT: I can see why it would work with OS as the screws go all the way through and are not screwed into the case. Yes it looks a new case is the way.
Yes, that was mentioned back in post #4.....

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

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