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HelicopterEngines Plugs Mufflers Fuel › OS 32 Broken Rod-
03-11-2003 01:16 AM  14 years agoPost 1
gwallace1

rrVeteran

Susanville, CA

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I was flying my Hawk IV today doing climbouts and at about 60 ft the engine just stopped without any warning. I autoed straight down, a little hard but only cracked a landing strut, which is only the second auto I have ever done, the last was a t/r failure, but never on purpose. Thanks G2!!! No other damage what so ever, thankfully because I just put on new 550 glass blades.
Well I tore the engine down which only has two gallons of Byron 15% with 20% synthetic through it, and found the rod end (crank end) was completely gone. There was a ton of aluminum shavings from it and the crankcase was scored really bad. All bearings were still smooth, but I have no idea what caused this. I am not running lean, main needle out 1 1/2 turns, low needle at factory. Has anyone had this happen? It is still under warranty and I sent it off today. How is hobby services on these, and what can I expect for a turnaround time?

Greg

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03-11-2003 01:28 AM  14 years agoPost 2
Gary Jenkins

rrElite Veteran

Nowhere, US

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I hate to disagree but it was to lean. I sent a OS 50 with a scored cylinder from running to lean, bad fuel filter, and they replaced the engine with a new one for free.

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03-11-2003 01:30 AM  14 years agoPost 3
capebob

rrVeteran

Cape Coral, FL

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My experience with Hobby Services has been very good. You can expect about a ten day turnaround if parts are in stock. You may get a new one.

Bob

Success is the ability to go from one failure to another with no loss of enthusiasm. Churchill

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03-11-2003 02:58 AM  14 years agoPost 4
gwallace1

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Susanville, CA

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Why would you say it was too lean? The carb is just about at the factory setting, maybe three clicks to the lean side, no more and the mixture control screw has not been touched.... The cylinder was not scored, just around the crank from where the broken rod peices got chewed up. The cylinder looks brand new, not a mark on it, piston is clean and not discolored or pitted and the glow plug is not burnt white. Other than the rod falling apart the rest looks perfect. Not to disagree, but I am running a bit more rich than anyone else I have flown with. They keep telling me it is time to lean it out.... . Either way as long as the engine will be replaced or repaired I will be happy. Not to just disagree but wanting to learn why?

Greg

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03-11-2003 09:14 AM  14 years agoPost 5
G.Man

rrProfessor

Bristol

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Running too lean is the standard accusation for anyone who has had an engine failure...

However it is entirely possible that you just had a bad rod....

I have seen an engine where the bronze bush in the big end has pushed out of the rod and eaten into the backplate before... once the bearing moves slightly it gets no more lubrication and then it starts to sieze on the crank pin...

Sounds possible this has happened to you with all the ally shavings...

Don't Email me as I wont reply - PM Only (spam countermeasures)

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03-12-2003 05:23 AM  14 years agoPost 6
ChicoNick

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Chico CA

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Too bad about your engine. It sounds as if you got a bad rod. When you get it fixed come down here to Chico and fly with us. Or if you go to Reno again let me know I might meet you there. Good luck with Hobby Services.

Nick

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03-12-2003 08:12 AM  14 years agoPost 7
sebastianforbes

rrApprentice

the wallops, hampshire, england

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hi there

i had the same problem once.

the prop nut that holds on the fan and clutch came loose. the only difference was that the engine slowly ground to a halt as the con rod ground away.
.

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03-12-2003 05:15 PM  14 years agoPost 8
gwallace1

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Susanville, CA

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Hey Nick,

Yeah as soon as I get it back I will let you know. Weekends best for you? Let me know.

Greg

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03-12-2003 05:37 PM  14 years agoPost 9
ChicoNick

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Chico CA

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Weekends are the best but I get out of school at 1 on Mon, Wen, Fri if you can meet up after that. Let me know and lets fly ,

Nick

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03-19-2003 04:37 PM  14 years agoPost 10
gwallace1

rrVeteran

Susanville, CA

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Well I just heard back from Hobby Services and they said that the con rod in my engine was defective. They sent out a brand new OS 32 for me yesterday, hopefully will make it here by the weekend!!!! If not it was still only about a ten to twelve day turnaround.

Greg

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03-19-2003 04:41 PM  14 years agoPost 11
FinnDave

rrElite Veteran

Kouvola, Finland

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Got to love a happy ending!

David S., Kouvola, Finland

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03-19-2003 11:49 PM  14 years agoPost 12
ChicoNick

rrNovice

Chico CA

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If you get it in time lets fly this weekend.

Nick

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03-20-2003 12:34 AM  14 years agoPost 13
gwallace1

rrVeteran

Susanville, CA

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Just checked and it won't be here till Monday. I am hoping I have a better schedule next month. Having to work is really cutting into my flying.. I will let you know.

Greg

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03-20-2003 01:31 AM  14 years agoPost 14
ChicoNick

rrNovice

Chico CA

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Ya, work sucks. So does school. I can't wait to retire. My plan is to retire by 30 so I still have time to have fun . Thats only 7.5 years, I guess I beter get started on figuring out how to be rich .

Nick

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03-20-2003 02:54 AM  14 years agoPost 15
gwallace1

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Susanville, CA

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Good luck!! I'll be 30 in September. I will let you know when I have some free time. I am supposed to have a lot of Sundays off next month, but our schedule probably won't be out for a couple of days.

Greg

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03-20-2003 08:51 AM  14 years agoPost 16
G.Man

rrProfessor

Bristol

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AT least you now know it wasnt lean, and it was a defective rod...

It does happen, even to OS..

Don't Email me as I wont reply - PM Only (spam countermeasures)

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03-20-2003 12:24 PM  14 years agoPost 17
Jagboy69

rrKey Veteran

Miami

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yeah... and defective piston crowns too//// glad it worked out for you..

Jason /// Sceadu50/9chp WWW.Jagboy69.com

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03-20-2003 05:23 PM  14 years agoPost 18
gwallace1

rrVeteran

Susanville, CA

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Yeah I am glad to know it was not my fault, and it did work out quite well. Hobby services sent out a new motor the same day they received it, which suprised me. Now I have to go through another break in, but at least it was under warranty!!

Greg

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