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HelicopterEngines Plugs Mufflers Fuel › How do you know when OS bearings are going bad
07-07-2008 05:18 PM  9 years agoPost 1
Cambo

rrApprentice

Phoenix, Arizona

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I keep thinking I am hearing weird noises coming out of the engine. The power is kind of there (Raven .50) but the engine just doesn't seem to have as much power as others i have seen. Is there a way of checking this without dropping the engine wich is a pain on century. I have close to 7 gallons through it.

Cameron

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07-07-2008 05:27 PM  9 years agoPost 2
saltbeetle

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Fairport, NY

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Does it sound like you are shaking a coffee can full of ball bearings? At 7 gallons, you are probably getting there.

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07-07-2008 05:30 PM  9 years agoPost 3
Cambo

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Phoenix, Arizona

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Ya, to some extent it does. It isn't really loud yet i can only hear it muffler side away from me

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07-07-2008 06:08 PM  9 years agoPost 4
Topher

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Rochester, Michigan

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Does it stay out late and starting to talk back?

will wash your heli for a quarter

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07-08-2008 12:48 AM  9 years agoPost 5
Cambo

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Phoenix, Arizona

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Here is the thing, the engine idles great, transitions fine, and seems to put out decent power running 30%. After doing a little research it is very possible that the lack of pop i am seeing compared to other heli vids on the net is my cyclic servos arn't very fast .20 and have a torque around 70oz. There is no significant rattle and i really can't tell if it is the gears (raven doesn't use any belts) wich are very loud on this bird. I am going down the lines of "if it ane't broke, don't fix it" The thing just flies really well and i really don't to tear the whole thing apart to find out the bearings are okay.

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07-08-2008 01:50 AM  9 years agoPost 6
utahbob

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St. George Utah

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rear brg

Hi--usually when the rear bearing is going you can hear it at idle: to be sure you can remove the glow plug; turn the heli upside down and remove the bottom plate and turn the crank over with your finger--if you feel roughness it's time for a change--if you do the "crank Mod" you can look at the balls to see if they are pitted and rough; be sure to orient the bottom plate correctly when you re-assemble; hope that helps!

I do a great decending funnel!

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07-08-2008 03:57 AM  9 years agoPost 7
Cambo

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Phoenix, Arizona

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Utahbob, i opened up the engine and did as you describe. There is no roughness. Furthermore, the engine sounds normal at idle so i think the bearings are good.

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07-08-2008 06:10 AM  9 years agoPost 8
Santiago P

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South West, Ohio

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The power is kind of there (Raven .50) but the engine just doesn't seem to have as much power as others i have seen.
Cambo,
When comparing engines, it only applies when the other engine is on identical helicopters, including mufflers, fuel, blades, pitch and cyclic setup, and most of all, pilots.

If not, you are comparing apples and oranges.

I have seen a heli been flown by the owner through a set of 3D manuevers, and then, flownn by one of the top pilots in the US, and the helis seem to have noticeable more power, the first one saying it was the owner, who was complaining of "not as much power as the visiting pilot.

I spend countless hours tunning. I enjoy it, and the best reward besides having a well running engine is listening my frieds say how much stronger my engine(s) is, specially when we all run identical setups.

Your engine may be very good, just need tender loving TWEAKING!

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07-08-2008 05:03 PM  9 years agoPost 9
DSR

rrNovice

Pretoria , South​Africa

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Well I know that it helps to tune the motor properly.
I had the tail drifting after 30 hours on my OS50 Hyper
and could not find out what coursed it. Replaced the bearings
and all was back to normal.

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07-15-2008 05:23 PM  9 years agoPost 10
Cambo

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Phoenix, Arizona

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Well, i had the engine out today and have decided to do a tear down. At idle i am noticing significant rattling noise and just seems to get worse every flight.

BTW, i was starting up the heli today and herd a loud pop. Turned out that when i was doing utahbob's method i forgot to put the glow plug back on tight. Was kind of funny.

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07-15-2008 06:31 PM  9 years agoPost 11
Cambo

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Phoenix, Arizona

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Well, i just got the whole thing apart. Engine is bear bones. I think my rear bearing is bad. I see no obvious flaws just looking at it but spinning the crank with the pistion out really showed the problem. It felt rough al the way around especially when the i put a little pressure on the crank to push it out. Once the crank was out i stuck my finger in the whole for the rear bearing and there is almost 1/2mm of play in it. The whole thing just feels really loose and really rough so i guese i need a new bearing. Any ideas as to were to grab one that isn't from OS. Would like to have one that is going to last more than 7 gallons. Also, while i have the engine apart should i replace the ring?

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07-15-2008 07:27 PM  9 years agoPost 12
JA Allen

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Waxhaw, NC

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Yes, it is worth the effort to put a new ring in while you have the whole engine apart. Cant hurt. Also, may be worth replacing the front bearing as well, if there was some lateral movement in the rear bearing, the front was probably taking the load. If it feels alright, then forget it.

Try BOCA Bearing, they have some great quality, longer lasting bearings for OS engines.

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07-15-2008 07:44 PM  9 years agoPost 13
Cambo

rrApprentice

Phoenix, Arizona

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Ya, i grabbed a bearing set from RC bearings. I am going to replace the front and back.

Maybe i will order a ring from tower

Cameron

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07-15-2008 07:57 PM  9 years agoPost 14
JA Allen

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Waxhaw, NC

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To make it easier to replace the bearings, heat in the oven, at about 300 Degrees, not too long, just to heat the case up good (should only be the case, bearings, remove everything else, make sure all o-rings are off the case)

Take the engine out while hot with an oven mitt, and rap the back square on a piece of wood, (prevents cracking or denting the case) and the rear bearing should drop out. Then for the front, a dowel, or something long enough, and with the diameter of the bearing from inside the case, tap it out. You can be tuff with these as you are going to toss them anyway.

Heat case again in oven for a bit, take it out, and using your oven mitts!!!! Replace the rear bearing, should be able to press in, but, if tight, should be tapped in with wood dowel along the OUTSIDE race ONLY. Make sure it is fully seated square. It should not have to be really forced

Front bearing same deal, or can use the dowel on outer race and tap in. Make sure it is seated square. Should not have to be really forced. Let cool.

Oil parts. Rebuild with Oil. Makes assembly of the crank, pins and ring easier. I will usually use just reg 30 weight engine oil while rebuilding, it will burn off first run, will keep parts from galling when starting first time dry, and get replaced by the fuel oil.

This is how I do it, others may have better tips. Mileage will vary which technique you use.

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07-16-2008 12:06 AM  9 years agoPost 15
RCMed-x

rrVeteran

westpalmbeachflorida​usa

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I will add put new bearing on crank while case is still hot and put crank and bearing in case . I use 1/4 in extensions a short one (3 in) connected to a longer one (6 in)put shorter one first thru back of motor attach longer one and tap with hammer thick part of short extension will push front bearing out.

A good teacher is a good listening student !

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07-16-2008 05:53 PM  9 years agoPost 16
TRACERBOB

rrVeteran

Closer than you​think

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It helps to assemble the main bearing on the crankshaft and place the crank assembly and the front bearing in the freezer for a couple of hours. That way, the bearings will drop right in the case.

Life is hard. Harder when your stupid

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07-16-2008 06:28 PM  9 years agoPost 17
Cambo

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Phoenix, Arizona

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Okay, sounds good.
I like the bearing in the freezer and then heating the crank idea.

Cameron

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07-16-2008 07:19 PM  9 years agoPost 18
TRACERBOB

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Closer than you​think

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I like the bearing in the freezer and then heating the crank idea.
Heat the case, not the crank. Crank and bearings go in the freezer.

Life is hard. Harder when your stupid

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07-16-2008 08:27 PM  9 years agoPost 19
Cambo

rrApprentice

Phoenix, Arizona

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Oops, typo, was thinking that but typing another

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07-16-2008 08:27 PM  9 years agoPost 20
JA Allen

rrApprentice

Waxhaw, NC

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Nice. Even better. Gonna note this.

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