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HelicopterEngines Plugs Mufflers Fuel › is it safe to grease the throttle barrel?
11-28-2007 07:52 PM  10 years agoPost 1
xxcysxx

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Baltimore, MD - USA

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hello,
i was wondering if it is safe to grease the throttle barrel. the barrel on the carburetor that rotate to adjust the throttle.
the engine is brand new, and feel loose and move freely. however, sometimes it feels a little notchy. i think this is part of it being brand new. i think a little triflow grease will smoothen it. but i'm worry if it will affect the engine in anyway if i grease this part. have any of you grease your engine barrel.

thanks

Tam

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11-28-2007 09:06 PM  10 years agoPost 2
Rick_H

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Boulder City, Nevada

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Don't grease it. The oil in the fuel will lub it well enough.

Rick

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11-28-2007 09:14 PM  10 years agoPost 3
michael88997

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Lewisville,Tx

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if you have never fired up the engine you can put a couple of drops of after run oil in the carb and in the engine itself to lube it some

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11-28-2007 09:52 PM  10 years agoPost 4
GMPheli

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W. Bridgewater, MA USA

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I grease them all the time. Especially the notch with the screw that moves the barrel in and out. Heavy duty wheel bearing grease. I also grease the O rings and seals. Never caused me a problem. Just took apart an old OS SFN-H that has a Supertigre carb that I greased 4 of 5 years ago. There was still some grease in the rubber boot. And I also lube my ball links with silicone oil, another thing that everyone tells you not to do

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11-28-2007 10:14 PM  10 years agoPost 5
xxcysxx

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Baltimore, MD - USA

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okay, someone says don't grease it. but it doesn't hurt the engine if i grease it right.
actually i was more referring to the screw that move the throttle barrel in and out. is it okay to grease this area. i feel this is the part that causes resistance to the notchy feeling when i turn the throttle barrel.

Tam

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11-29-2007 08:41 AM  10 years agoPost 6
Jafa

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Sydney, Australia

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I've had two C-Spec carb barrels lock up due to grease in this area

If you check that screw carefully I think you will find it's a tad too long - I file the bum off it and that seems to sort it out

The oil in the fuel does lubricate the barrel


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-29-2007 10:53 AM  10 years agoPost 7
ZXXflyer

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stone mountain, georgia, US

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9 times out of ten, the screw that retains the throttle barrel has a burr on it from the factory.. I file them and then wet sand. I also smooth out the groove in the throttle barrrel where the end of the bolt rides.
I've actually had the throttle on one of my 30 size helis lock up at wide open before.. luckily I was low on fuel and can auto no problem.
When I pulled the carb apart sure enough the bolt/pin had a rough end on it.

Believer in Weston motors!

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11-29-2007 01:15 PM  10 years agoPost 8
GMPheli

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W. Bridgewater, MA USA

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How can grease make it lock up? If you fill it maybe? Then it will still work, it would just be slow as it forces the grease out. Maybe poor quality grease that hardened? A little grease is not going to hurt anything and will help it from wearing. I have done this many times and have never had a barrel lock or any problems.

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11-29-2007 01:32 PM  10 years agoPost 9
jbiter

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Sebring, FL

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Grease shouldn't hurt the motor unless we are talking about a YS motor. The silicone diaphram in those doesn't get along to well with petroleum products.

Jeff

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11-29-2007 05:14 PM  10 years agoPost 10
xxcysxx

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Baltimore, MD - USA

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Well, its not the ys engine. It a thunder tiger 90 pro engine. The throttle barrel is not as smooth as i like it to be. I just wanted to add some triflow grease to the screw that hold the throttle barrel to smoothen it out. But i will check it first to make sure there is no machining burrs and file it smooth first.

Tam

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11-29-2007 05:23 PM  10 years agoPost 11
Cope

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South Lake Tahoe CA

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Try flow is a non petroleum based lube is it not?

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11-29-2007 09:39 PM  10 years agoPost 12
xxcysxx

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Baltimore, MD - USA

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i went to the triflow lubricants website and it doesn't mention anything about petroleum. but it says synthetic grease. what does that mean?

what about "3 in 1 oil", is this safe.
a local club member just warn me that some grease and oil are penetrating and could cause damage to the engine. maybe i'll just call all this greasing idea off. i'll get some after run oil and use that instead.

Tam

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11-30-2007 09:16 PM  10 years agoPost 13
JuanRodriguez

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The Villages, Florida

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My vote would be NOT to grease it. Grease can attract dirt and when enough is mixed with it, you're creating what in essense is a grinding compound.....

Same goes for the ball links.....ie, no grease here....not needed, IMO.

as has been said, probably a small burr than can be easily cleaned up or the screw is a "tad" too long.

All that being said, PLEASE, let's not start a pissing contest over this issue as is normally the case here on RR lately.......

These are opinions and everyone may do things a little differently. That does not mean one is "right" or "wrong".....

Bottom line, everyone is free to choose whatever method suits them best.....

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12-01-2007 02:31 AM  10 years agoPost 14
GMPheli

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W. Bridgewater, MA USA

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I agree with Juan. But now I have to counter with my opinions (G). I highly doubt any dirt is going to get thru the little bit of clearance between the throttle barrel and the carb body and into this area in question. And having a little excess grease oozing out of areas like this is actually quite beneficial. If there are small particles of dirt vibrating around the area, the grease will catch and hold them, preventing them from vibrating around and working there way into the places where you don't want them to go. This is a high vibration/wear area. Do you need grease? No. But I can guarantee that it will wear less with it. The person who said it caused his barrel to lock must've used poor quality grease that was not up to the temp, or his carb barrel could have been coated with something that reacted with the particular grease. OS likes to coat there throttle barrels with some kind of anti friction/rust material. Coating the throttle barrel with grease also helps to seal against air leaks. When I install a carb, I coat the O-ring and the screws with the same high temp wheel bearing grease. Here too, it helps to seal against air leaks. Head bolts, back plate gaskets and bolts, and head gaskets also get a thin coating of grease. And the next time you have a new ball link that is a little tight, put a light coating of silicone oil on the inside of the ball link before you fit it. They fit so tight that there aint no way dirt is going to get in there. And the link will be much easier to move, and break in perfectly to the ball. I never use ball link pliers as they nick balls quite often. These nicks will wear out your links in short order. I am a technician by trade. I see the value of proper lubrication as a lot of the machines I work on run 24/7. However, to each his own. I am just telling you what works for me. You have to sift thru all the advise and do as you see fit.

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12-01-2007 07:17 PM  10 years agoPost 15
J Kofoed

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Denmark

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I use triflow to grease the throttle barrel, all links and one way bearing, not on sliding parts like tail- and main shaft.

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12-03-2007 07:40 PM  10 years agoPost 16
xxcysxx

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Baltimore, MD - USA

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Well, i did it. I went ahead and grease everything. I disassemble the entire engine and greased everything with triflow synthetic grease.
I disassemble the entire carberator assembly and cleaned it with ronsonol (zippo lighter fuel). You should of see how much machining burrs i got out of it from all the cleaning. I greased the throttle barrel, every needles rubber o rings i could find, and the rubber o rings from the carberator and back plate. I also grease the aluminum gasket that sit between the head and crank case.

the throttle barrel feel very smooth now. But i felt a lot of resistance from the grease when i rotate the barrel. Is this going to be okay this way. Will this bog down a high speed servo inline with a governor?

Tam

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12-04-2007 08:17 AM  10 years agoPost 17
Jafa

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Sydney, Australia

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How can grease make it lock up?
Maybe poor quality grease that hardened?
Exactly

Both mine were factory greased, had never been dismantled, were within their 1st 50 flights, the grease hardened and stalled the throttle servo (S9253 - not strong).

It's very rare but it does happen


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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12-04-2007 12:45 PM  10 years agoPost 18
GMPheli

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W. Bridgewater, MA USA

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I have never used mine with a govenor, but they quickly loosen up from heat and use. Check it after the first flight.

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12-04-2007 01:10 PM  10 years agoPost 19
dkshema

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Cedar Rapids, IA

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There is absolutely no reason to grease any part of your motor, throttle barrel included.

There's enough lube in the fuel you're running to keep things moving nice and free.

Grease is asking for trouble, as it will eventually collect dirt and dust and then you WILL have a problem with things getting stuck.

There's also a good chance that the fuel, combined with it's built-in lube will wash away the grease in short order.

Yes you can grease it. No, it's not necessary. In nearly 40 years of RC flying, with dozens of motors, I've never run across a carb barrel that needed greasing, or one that benefitted from greasing.

If you removed burrs from the machining process, good for you. Don't complicate matters by performing maintenance that has no reason for being done in the first place. Keep it simple.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-04-2007 01:17 PM  10 years agoPost 20
HeliPhil

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Brentwood, Essex, UK

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yep - find the problem, don't add to the problem. There should be more than enough oil from the fuel to lube the barrel. If its not smooth then find out why....

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HelicopterEngines Plugs Mufflers Fuel › is it safe to grease the throttle barrel?
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