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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Piston pin retainers
10-17-2017 09:45 PM  22 months ago
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datidun

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N Ireland

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Piston pin retainers
Just wondering how often do you guys change the pins on your engines.
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10-17-2017 10:17 PM  22 months ago
EEngineer

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TX

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When you change the connecting rod....

And also change the wrist pin retaining clip.
Logo 600SXs, 800XX, TDR IIs
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10-19-2017 12:36 PM  22 months ago
datidun

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N Ireland

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Thought maybe every 2nd year.
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10-19-2017 12:54 PM  22 months ago
EEngineer

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TX

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There is no set date.Logo 600SXs, 800XX, TDR IIs
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10-19-2017 06:22 PM  22 months ago
Dawiev

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Middle East

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Unless you have another reason to open the engine, I would certainly not do it just to replace them.

Never reuse them.
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10-22-2017 08:26 PM  22 months ago
Richardmid1

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Leeds, England

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After a very long time! Change the clips if you are changing the piston though. The conrod will wear first but even then mostly at the crank end. I once bought a conrod for my 105 as I was replacing the piston and thought I might aswell as I had it apart but the new one had no less play than the old one so I never put the new one in!60% of the time, it works every time!
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10-23-2017 12:15 AM  22 months ago
wjvail

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Meridian, Mississippi

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Piston pin retainers
Never - unless there is some overriding reason to. i.e. one slips out of my needle nose pliers and shoots across the room, gets tweaked (however slightly) while being removing or inserting, becomes corroded etc. Helicopter motors do not see sufficient stress to warrant changing gudgeon retaining clips on an interval.

Bill
"Well, nothing bad can happen now."
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04-21-2018 04:43 PM  16 months ago
datidun

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N Ireland

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An old post but I lost my 55 today around a year old ran great and the pin came out screwing up the piston and sleeve, the clip is solidly wedged under the sleeve, what on earth causes the pin to come out?
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04-21-2018 04:52 PM  16 months ago
wjvail

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Meridian, Mississippi

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datidun...
An old post but I lost my 55 today around a year old ran great and the pin came out screwing up the piston and sleeve, the clip is solidly wedged under the sleeve, what on earth causes the pin to come out?
Had the clip ever been removed? If they are ever bent, no matter how little, they are much much more likely to become dislodged.
"Well, nothing bad can happen now."
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04-21-2018 10:50 PM  16 months ago
datidun

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No never been moved at all, I cant see how a clip can wear down.
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04-21-2018 11:35 PM  16 months ago
wjvail

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Meridian, Mississippi

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Is it possible it over rev-ed? That can cause a motor to toss a keeper. Even that is pretty unlikely.

Are you sure you lost a wrist pin retainer? You have the piston out of the sleeve and your looking at the wrist pin hole in the piston? Can you post a picture? What does the glow plug look like?
"Well, nothing bad can happen now."
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04-22-2018 09:48 AM  16 months ago
datidun

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N Ireland

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Glow plug looks good engine looks good inside, piston ring still black and no scoring on piston,I cant get the sleeve out at all, I always run on the rich side side, first flight of the day was good then about to start her again there was a loud clickhead speed 2050 idle up, thats not to high to throw a clip off.
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04-22-2018 10:02 AM  16 months ago
datidun

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04-23-2018 01:09 PM  16 months ago
Richardmid1

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Leeds, England

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So it might not actually be the wrist pin retainer? Could even be something that got dropped or sucked into the carb?60% of the time, it works every time!
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04-23-2018 01:50 PM  16 months ago
datidun

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N Ireland

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Its one of the clips for sure, look closely at the first picture, it will have to removed with heat the sleeve is jammed solidvibration and over rev is unlikly to remove a clip from its groove.
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04-23-2018 02:41 PM  16 months ago
Richardmid1

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Leeds, England

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Try pushing the liner back down then rotate the crank to get the piston all the way down then try prize the liner out again with the piston at BDC.60% of the time, it works every time!
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