November 01, 2024, 01:39:03 AM

Author Topic: Clutch liner replacement  (Read 7411 times)

Offline Mike Spano

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Re: Clutch liner replacement
« Reply #15 on: November 13, 2015, 01:56:38 PM »
this is only my personal experience, I am in no way saying that OS or YS are wrong, nor am I telling you to not follow their direction.....only expressing my experience.

I used to have horrible issues with regulators sticking, carbs gunking up, crap like that. every day I would run my heli dry by pinching the fuel line. one day I forgot to do this, and the next my heli fired right up. from that day on, I have left fuel in my reg and carb after the days flight and have not had one single issue of a carb gunking up, or a reg sticking again....not one single time....
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Offline Danny Dugger

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Re: Clutch liner replacement
« Reply #16 on: November 13, 2015, 02:27:13 PM »
I also recently talked about this to a friend of mine who is a very long time nitro guy. He said that he used to burn the fuel out of his engines religiously and experienced a number of failures from gummed regs to failed main bearings in both YS and OS engines. He said since he stopped doing that his engines have lasted significantly longer, and run perfectly so I now do the same. I think maybe it burns too much of the oil off and unless you use after run oil EVERY time you're better off leaving the fuel in the crank case. (But I always use ARO if I know she's going to sit for an extended period of time.)
 Just another .02c

BTW if you're burning clutches just by shutting fuel off there's a possibility that your low needle is dirty rich or your idle is set too high... or consequently both. Just a thought... obviously I've never seen nor heard your rig but thought I'd put it out there. :)
« Last Edit: November 13, 2015, 02:58:02 PM by Danny Dugger »

Offline Rodney Kirstine

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Re: Clutch liner replacement
« Reply #17 on: November 13, 2015, 08:08:20 PM »
That's what autorotations are for!
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Offline troasb

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Re: Clutch liner replacement
« Reply #18 on: November 14, 2015, 08:51:36 AM »
So I understand you are advising me to leave fuel in the engine and not run it dry . This is the absolute opposite of what I have learned and experienced during my 38 years in the rc world. I early learned that if you leave the engine with fuel in the crankcase and carb, they will rust and the bearings will be ruined. So my procedure for preserving engines have always been to run them dry and add after run oil if they are not to be used for some time. This have always worked for me.

But the O.S. 105 HZ-R is the first engine I have had that have a regulator so it may be a little different. Also, helicopter engines due to their installation is difficult to add after run oil to them. I have had no problems starting the 105 using my dry run procedure. But as I now have broken another clutch with no hot starts or any other high strain on the clutch apart from my dry run procedure I cannot find another reason to this but that the dry run is ruining the clutch.

Offline garettoku

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Re: Clutch liner replacement
« Reply #19 on: November 14, 2015, 11:09:10 AM »
+1 to not running the helicopter engine dry.  No need for the excess wear on the drive train. 

In regards to the engine, its probably not the running dry that is damaging.   I think the damage happens when you start a dry motor.   I have a YS 91sr from 2006.  Never changed anything.  I put it in a drawer for 10+years and just reinstalled in my N7 this year.  It pulls like new.

« Last Edit: November 14, 2015, 11:15:12 AM by garettoku »

Offline troasb

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Re: Clutch liner replacement
« Reply #20 on: November 18, 2015, 03:05:35 AM »
I thought I had read in the instructions coming with my O.S. 105. HZ-R that you should not leave fuel in the engine after a session. I took a look in the manual today, and yes; it is clearly stated that: "Do not leave unused fuel in the engine at the conclusion of a days flying" And the manual says this about the regulator: "DO NOT allow fuel to remain in the regulator"

So I am not sure who to listen to, O.S. you guys, or my 38 years of experience with nitro engines.

Offline Danny Dugger

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Re: Clutch liner replacement
« Reply #21 on: November 18, 2015, 06:56:29 AM »
If you want to be safe: instead of running it dry at the end of the day pull the fuel line, pull the glow plug out, hold a paper towel over the hole and turn it over with your starter for a few seconds to clear the engine and add some after run oil.

Offline Mike Spano

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Re: Clutch liner replacement
« Reply #22 on: November 18, 2015, 07:34:39 AM »
that is why I explicitly stated
this is only my personal experience, I am in no way saying that OS or YS are wrong, nor am I telling you to not follow their direction.....only expressing my experience.
....in my post....
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Offline Danny Dugger

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Re: Clutch liner replacement
« Reply #23 on: November 18, 2015, 11:00:21 AM »
that is why I explicitly stated
this is only my personal experience, I am in no way saying that OS or YS are wrong, nor am I telling you to not follow their direction.....only expressing my experience.
....in my post....
Also why I added:

Just another .02c

...to mine as I was adding a personal account to what Mike said.
In the end it's your helicopter, do whatever you feel is best for it. I think nitro fuel has come a long way over the years and probably doesn't eat engines alive like it used to due to modern corrosion inhibitors and synthetic oils. When I had my backplate off week before last the crank and bearing looked just fine and she runs like a top.

Offline troasb

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Re: Clutch liner replacement
« Reply #24 on: November 18, 2015, 12:42:43 PM »
Well, I am an old guy in this game, and I guess things have changed to the better. When I started i rc in 77-78 we only used FAI fuel without nitro and only plain castor oil, and had no problems with rust and corrosion, but had to preserve the engines with after run oil if the engines where not to be used for months or more or as the castor would gum and seize the bearings.

In my rc-car racing time, we used 25% nitro and 10% castor oil that we usually blended by ourselfes. And this could not be left even overnight without rust taking place. We either had to run the engines after the days racing with plain 0% nitro fuel, or flush the engines with 5-56/WD-40 and running it through on the starter.

A few years ago, about 4 years i think, I got myself an O.S. 200 fourstroke engine. Due to servo failure the plane and engine went down very hard, totally destroying the plane and major damage to the engine. I was told by the supplier of the fuel that  I was using, about 15% nitro, had additives to prevent rust and corrosion, so I didn't have to think about preserving the engine while I was getting new parts for it. Well, when I took it apart some months later, it was totally corroded inside, and it went in the trash. So much for modern fuel 4 years ago.

To this day I have never seen a nitrofuel that is corrosionproof, and I have my doubts if I ever will. Methanole attracts water, and nitro leaves very corrosive remains in the engine. This is a sure recipy for corrosion that is very difficult to avoid.

Offline Danny Dugger

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Re: Clutch liner replacement
« Reply #25 on: November 18, 2015, 04:19:10 PM »
Yes corrosion inhibitors slow corrosion, they do not prevent it. That's why I feel OK leaving fuel in for a day or two between flights but not long term. If it's going to sit I clean it out using the method I mentioned above. I respect your time in the hobby and your opinions and experiences. I agree with your statements about fuel above 100%. I'm only saying it's my opinion that running an engine lean until it cuts off on a regular basis and leaving it dry may be a little hard on the engine. Even if you prefer to run the engine dry you would probably be better off adding after run oil every time instead of leaving it dry. I was only recommending leaving fuel in it for short term intervals in a regularly flown heli :) For short term I think the fuel may be less harmful than run dry and left dry. After run oil is obviously the best option in any case.