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HomeAircraftHelicopterMain Discussion › how to DeRust an engine?
03-28-2005 04:40 PM  13 years agoPost 1
Liron alm.

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Israel

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hi
I own a TT36 engine. it was mounted on my R30 and was replaced by a used o.s 32 due to "mood efect".
the engine just gave me a hard time tuning it.

the o.s 32 didnt gave me as much power as the TT36 so I decided to
mount the TT back using the o.s carb.

while installing it, I took off the back plate and I discovered some rust on the wheel that hold the piston rod (dont know whats he's name )

two Q's:
1 - how do I take the rust off? - can I use WD-40 to Derust the engine?
if so - how?

2 - do you think installing the o.s carb on the TT engine is a good idea?

thanks
Liron

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03-28-2005 04:48 PM  13 years agoPost 2
Leif

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USA

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If you've got visible rust inside the engine, it's quite likely that the rear engine bearing is also rusted. If this is the case, I would recommend NOT putting this engine into your R30 until you rebuild it.

Rusted bearings in an engine will cause major problems, including potential RF interference.

An OS37 would fix all your problems...

Leif

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03-28-2005 05:06 PM  13 years agoPost 3
Liron alm.

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Israel

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leif
thanks for the quick reply.
at second check, the rear bearing seems to be rusted.
how can i replace it?
where can i get a new bearing?

as for the other parts, can they be DeRusted?

will the WD40 take care of it, and if it will,
wont it Derust the rear bearing as well?

liron

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03-28-2005 05:23 PM  13 years agoPost 4
1275mini

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Wirral North West U.K.

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Bin it it will be cheaper to to that !!

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03-28-2005 05:31 PM  13 years agoPost 5
Leif

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USA

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No, you can't "de-rust" a bearing. You would need to replace it. Replacement bearings can be purchased from most hobby suppliers. Some people also buy bearings from more general hardware suppliers or direct from bearing companies such as Boca. Other parts MAY be cleaned up, but if the interior of the engine is rusting then chances are the sleeve is also rusted. That part also cannot be easily de-rusted without component replacement.

Considering that you didn't like this engine in the first place (fussy setup), and it now needs a re-build just to get it in shape, you might be better off to simply write this one off.

The OS37 has more power than the TT39, and is as reliable and stable as the OS32. It's not that expensive and is a bolt-in replacement for the 32-size engines.

Leif

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03-28-2005 05:32 PM  13 years agoPost 6
Liron alm.

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Israel

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Bin? you meen throw it away?
sorry, but i cant understand the logic of that...

how much can a new rear bearing cost?

if i'll take the rusted purts and send them a bit with a super fine sending paper.
will it do the work or will it out balance the engine?

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03-28-2005 05:38 PM  13 years agoPost 7
1275mini

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Wirral North West U.K.

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a lot of work and it will have to spot on inside and out just go and buy a new one ! it will work !!!

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03-28-2005 06:00 PM  13 years agoPost 8
Leif

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USA

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Yes, BIN it means throw it away (in Brit)! And yes, there is some logic in this.

The TT engines have their issues, including less than optimum carb design, leaky front bearings, and overall lower machining quality than OS engines.

You'll spend about $25 (or more) for a set of bearings for the engine, then you'll need to replace them (which involves cooking the engine in an oven to expand the metal to remove the old bearings), complete dissasembly of the remainder of the engine to check and possibly "de-rust" the other internal parts (assuming that you can... sometimes head screws just refuse to come out). Then, assuming you can clean and polish the other parts and get it back together correctly you'll be messing with an attempt to retrofit an OS carb onto this engine to eliminate the fussy mixture behavior... and all to get just a tad more performance than an OS32 stock.

Get a new engine, and it'll work perfectly from day 1.. and will probably give you years of good use. Oh, and next time oil your engine properly before storing it for any long period of time.

Leif

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03-28-2005 06:03 PM  13 years agoPost 9
1275mini

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Wirral North West U.K.

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I have been running a TT39 now for 2 years never missed a beat lovely little engine

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03-28-2005 06:13 PM  13 years agoPost 10
Liron alm.

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Israel

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you got me wrong...
the engine was never stored more then a weak...
the carb was allready fitted and the engine is running good,
but i still worried about the rust...

b.t.w, the carb is a direct fit to the TT engine. i'll take it flying on friday and see how does it work

liron

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03-28-2005 06:15 PM  13 years agoPost 11
RobRoy

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Huntsville, Alabama

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I have a TT36 in my rappy, and would put it up against an OS32 anyday. I know I have what can be described as the exception, but it has been a great engine for me. I even had to limit the upper end of my throttle curve to 85% due to the head speeds exceeding 2100. I will agree, it took a good bit more tuning than my OS to get it running sweet, but once there it's been great ever since.

Ignorance is curable, stupidity is for life.

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03-28-2005 06:15 PM  13 years agoPost 12
crowfly

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Pleasant View, TN U.S.A.

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Does the O.S. 32 have the same size rear bearing as the T.T.36???? If so, that would be your cheapest way out. Run that until it is worn out then buy a new engine.

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03-28-2005 06:34 PM  13 years agoPost 13
Liron alm.

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Israel

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Great idea!!!

does anyone knows if the have the same sized rear bearing?

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03-28-2005 06:53 PM  13 years agoPost 14
w.pasman

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Netherlands

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It may be not rust but just baked oil. May be caused by running the engine too hot, (or maybe by using non-synthetic oil?) I dont think that the rod can rust anyway. I would try to clean it. Maybe you can slide the pin through the hole until it moves smooth again?

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03-28-2005 06:57 PM  13 years agoPost 15
Liron alm.

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Israel

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the engine is turning smoothly.
i can see the rear bearing is rusted...
anyway, the engine gave me no problem beside tuning properly...

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03-29-2005 03:17 AM  13 years agoPost 16
crowfly

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Pleasant View, TN U.S.A.

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according to Boca Bearing Company, the O.S.32 & the T.T. 36 have the same size rear bearing. Sorry but I forgot to look at the front bearing. It's probably O.K. anyway. You can check it out at http://www.bocabearings.com

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03-29-2005 10:35 AM  13 years agoPost 17
Tuinkabouter

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Groenlo, Holland

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Why do you take the risk to crash a heli from $750+ for a engine from $150 ?

I Think you can better get a new one, I.E. the new OS37 as mentioned before.

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03-29-2005 11:15 AM  13 years agoPost 18
I3DM

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Israel

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Hey Liron,
if you need help replacing that bearing give me a call.

www.liorzahavi.com

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03-29-2005 02:19 PM  13 years agoPost 19
Supertoyz

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Colchester, VT

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Take the bearings out and take them to your local bearing distributor....."Bearing Specialties" or the likes. Check the Yellow pages for your area. They can get you the same size bearing of much better quality....usually for wholesale prices. If you have a little press you won't need to heat anything up just line everything up and gently press the bearing in until firmly seated.

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03-29-2005 03:24 PM  13 years agoPost 20
iskoos

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Orlando, FL

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Liron alm.
I would encourage you to fix that engine. It may cost you up to 40-50 bucks(most) and may require you put some time on that engine but R/C Hobby is NOT doing the things the easiest way.
A true R/C hobbyist should try to fix his stuff before considering getting a new one. I have one OS engine that I haven't run for about 6 years and the rear bearing rusted. I will go ahead and replace the bearing and clean up the rest of the rust. It won't cost me more than 20-30 bucks. Yes I will spend some time, but hey this is the beauty of it. I enjoy fixing up my stuff. It gives me fulfillment. At the end, what you are going to spend is not even half of what the new engine will cost. If you were to spend same as what the brandnew costs, then it wouldn't make sense to put that effort. But you will be ok in your case. Change the bearing, you can clean the rust on the back of the crankshaft(this is what you call wheel) by using fine sand paper. You can even clean the rust off of the piston and sleeve. But be careful here, use a sand paper (like1000 grid) and be very gentle. I always use some oil to minimize the scratches. If your OS 32 is ringed version, you will be safer. If it is ABC, then you don't want to sand outside the piston and inside the sleeve too much.
And Don't worry!.. your heli will not crash even if your engine quits on you. Every heli can auto down safely(if you know how to do it of course)
And even if you don't new engine doesn't mean that it wont quit. There is always risk of having flame out. This is part of this hobby.

Good luck

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