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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › curious about markings to my piston rod
01-12-2010 05:53 AM  8 years agoPost 1
LjCraft12

rrApprentice

Decatur Ga, USA

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when disassembling my os 37 engine I made the terrible mistake of putting pliers to it and scared the piston rod at the bottom. Now I am wondering if I should trust it to the rpms I am gonna run it at or not? what do you guys think?

AMA number 938047

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01-12-2010 06:33 AM  8 years agoPost 2
Heli 770

rrProfessor

USA.

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Photos would help.

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01-12-2010 07:00 AM  8 years agoPost 3
TMoore

rrMaster

Cookeville, TN

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Unless you crushed one of the bushing features I would deburr it and go.

TM

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01-12-2010 10:28 AM  8 years agoPost 4
JRjoe

rrElite Veteran

Jonesville , IN USA #1

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Unless you crushed one of the bushing features I would deburr it and go.
I'd agree with that. Yes photos would help too.
I gotta ask, why are you disassembling the motor?


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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01-12-2010 12:52 PM  8 years agoPost 5
SteveH

rrProfessor

Texas

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Or, you could just buy a new one if you are worried about it....a new one is $17 at Ron's.

The government cannot give you anything without first taking it from someone else.

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01-12-2010 04:08 PM  8 years agoPost 6
LjCraft12

rrApprentice

Decatur Ga, USA

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I saw some rust on the piston itself and did that I know how to disassemble nitro engines but I see that these are a lil more different than nitro car engines. On my nitro car engines I rarely care about rust cause I just don't but this heli is proably one of my biggest investments almost a $1000 down on one heli I am cleaning the mess out of this thing lol. Also i got some after run oil on the bearings and people were saying thats not good so thats when I said i was going to clean the whole engine. But yeah i didn't scar it that bad and yeah I was debating on getting a new one since they are cheap.

I was also looking at some other pages talking about making marks on the engine parts getting more performance out of the engine how do ya'll feel about that. (personally I don't trust my self if I did do it, it would be to a car engine not my heli lol)

AMA number 938047

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01-12-2010 04:30 PM  8 years agoPost 7
Alexm0324

rrApprentice

Atlanta, Georgia USA

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I see a few issues here. 1. You say the piston is "rusted". An OS 37 piston is aluminum, so there should be no rust, but maybe burnt oil buildup which is pretty common depending on your fuel choice. 2. Whoever told you not to use after run oil is a bit misinformed. After run can eat away at O rings (depending on the formula and it takes a long time), but after run is better than no after run for keeping your bearings from getting pitted. O rings are the cheapest component in your engine.

If you could post a picture of the con rod we can probably help you out here. It would also be helpful to know what fuel you are running.
The other option is that you can come visit us at Atlanta RC Club since you are in Decatur. We usually have quite a few heli guys out there that are willing to help.

http://www.atlrcclub.com

for directions and info.

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01-12-2010 04:45 PM  8 years agoPost 8
LjCraft12

rrApprentice

Decatur Ga, USA

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yeah I am taking the engine out the heli now so give me 10 mins

I should prolly buty a new connecting rod huh?

AMA number 938047

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01-12-2010 05:56 PM  8 years agoPost 9
Ironhide

rrVeteran

dexter mi us

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Buy a new one or don't worry about it . Its just a 37 ,no offense . Put a listing in the classifieds . Someone will hook you up .

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01-12-2010 06:02 PM  8 years agoPost 10
Alexm0324

rrApprentice

Atlanta, Georgia USA

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+1 on Ironhide's reply. It might be ok... but why risk it.

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01-12-2010 06:54 PM  8 years agoPost 11
jschenck

rrProfessor

La Vista, NE.

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I would have no problem running that.

If you are having to force it there's probably something not right. Come back here and ask before taking pliers or a hammer to it and I'm sure someone can help you get it right!

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01-12-2010 06:58 PM  8 years agoPost 12
RaptorMan23

rrKey Veteran

Sioux City, IA

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Im with John ^^^^^^, granted that pliers arent the answer, that is totally runnable. Take some scotch brite pads, acetone, and smooth it up. But even that isnt really necessary, just make sure there are no burrs and go flying, dont buy a new conrod, total waste of money

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01-12-2010 07:08 PM  8 years agoPost 13
Heli 770

rrProfessor

USA.

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Most of the stress on a connecting rod is on the compression stroke. Next time if the rod won't slide off the crank pin use an L shaped tool under the rod and work on both ends of the rod so it won't bind on either pins.

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01-12-2010 07:11 PM  8 years agoPost 14
jschenck

rrProfessor

La Vista, NE.

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^^ exactly! Work on sliding the con-rod over to the very back of the pin on the piston side then it should slide right off the crankshaft. The L wrench is what I usually use also. Put some oil on the piston pin if it's not sliding easy and a bit of heat if there is some varnish/buildup.

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