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MTA Hobbies . Model Rectifier Corp . PowerHelis

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Engines Plugs Mufflers Fuel > Inspect The Inside Of My Motor After 9 Gallons (Please Look)
 
 
rupps5
Heliman
Location: columbus ohio

This is my first nitro engine, and it has 9 gallons of 5 or so different 30% and new magnum blend through it. I don't know what to look for if anything is wrong. The motor was running the same as when I bought it, which was fine except for bogging which I think is from the bad batch of carbs. The reason the engine is apart is because I sent the carb in for the exchange and thought I should have a look at the inside of the engine. The rear bearing is a little rusty but it is very smooth.

Well tell me if you see anything that needs to be replaced.

Thanks
jeff

















10-17-2008 03:36 AM
 
 
Futura SE
Veteran
Location: Fayetteville, Arkansas

Looks fine to me. That a YS SR???

Norman Ross Jr.
10-17-2008 04:14 AM
 
 
rupps5
Heliman
Location: columbus ohio

oh ya the engine is a tt53rl
10-17-2008 04:20 AM
 
 
Fly X Cell
Senior Heliman
Location: Hampton, VA

Put in new bearings

And hone that cylinder, put in a new ring, and see if you can get rid of the other rust spots. You've already got it open, so just do it while you wait for your new carb.

Furion 450
Stratus
Ion X2 Actro 32-3
Razor 600
MIniatureAircraftUSA Team Pilot
10-17-2008 04:55 AM
 
 
rupps5
Heliman
Location: columbus ohio

How do you hone sleeves? Would you use a hone for real car brakes or do they make something specific to rc engines?
10-17-2008 11:14 AM
 
 
George Matthews
Key Veteran
Location: N.W. Ohio

I would clean and reassemble.
The only thing I see that is of some concern would be the vertical marks on the sleeve. But as long as it was running strong I wouldn't be too concerned.
In fact the ring looks very good as I don't see any discoloration of the ring at all which is good.
If the rear bearing is smooth then the bit of rust you are seeing on the race I would consider normal.

George Matthews
Team MRC/Hirobo
Team Wildcat Fuels
RCPrecisionHeli.com
10-17-2008 11:56 AM
HOMEPAGE  
 
 
bl8zn
Senior Heliman
Location: Union County, NJ

Rebuild and fly it.

Jason "Fly or Die" Gonzales
"Stop your Whining and get to Flying "
10-17-2008 04:47 PM
 
 
Inspector Fuzz
Veteran
Location: Austin, TX. Where fat chicks succeed.

It all looks fine.
The only thing I would consider is a new rear bearing. If that one is still really smooth you may be OK with it. The balls are not rusty and are still shiny not dull.

Based on the color of your piston, you may be able run a little bit leaner than you have been. If you are happy with the power no need to mess with it, though.

Argue for your limitations and sure enough, they're yours
10-17-2008 06:04 PM
 
 
Funky Trex
Key Veteran
Location: Westerville, OH - USA

That engine looks great. It still has tons of life left before it needs a rebuild IMO. The only thing I would consider changing are the bearings since you have it apart already and it has 9 gallons through it.
10-17-2008 06:04 PM
 
 
bl8zn
Senior Heliman
Location: Union County, NJ

Be sure to close the carb barrel, clamp the fuel line to the carb and plug your exhaust after a days flight. I also run the engine dry of fuel on last flight...just clamp the fuel line and let the engine die.

Jason "Fly or Die" Gonzales
"Stop your Whining and get to Flying "
10-17-2008 06:47 PM
 
 
frickey295
Senior Heliman
Location: Avenel NJ USA

Looks good !!
Curious to see how the rear bearing longevity compares to OS
As funky stated, do the bearing while its apart

Frank

Vibe 50 BLS 451's ,Hyper, BW pipe, GY 611 , T REX 700 OS91 HZ
10-17-2008 07:26 PM
 
 
dkshema
rrProfessor
Location: Cedar Rapids, IA

Only 9 gallons, it's still a baby.

Hone the cylinder? It appears to still have most of its original cross-hatching from the factory, I see no glaze on the cylinder walls. I see no reason to do much other than put it back together properly, retune the new carb, and go fly.

-----

But....

If you have the burning desire to hone the cylinder, use one of these -- available from most auto parts stores for something on the order of $15 or less.



And if you DO hone it, take it out of the crankcase first. Clean it well afterwards to remove any grit left behind. Reassemble using after-run oil, and go break it in all over again.

-----

Oh yeah, one more thing. Your motor's parts seem to be laying around on some nice carpet or fuzzy terry cloth. That's a great way to get all sorts of nasty debris -- fibers, dirt, grime, slime -- on the parts. Clean it well before reassembly to remove all the foreign material from the various parts.

Lightly tighten the six head bolts using a diagonal pattern as shown below:



After you've lightly tightened all six bolts, repeat the process a couple more times, torquing the bolts a bit tighter each time. The diagonal pattern distributes stress evenly around the cylinder and insures that the head is flat on top of the cylinder. Don't overdo the torque to the point where you strip threads or break bolts, but after two or three iterations, you'll have the head bolts good and snug and they won't come loose on you.

-----

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

Dave
10-18-2008 05:04 AM
 
 
airdodger
Elite Veteran
Location: Johnston USA

Any rust in the engine is not good, rust is going to dislodge and cause wear, may get between balls on the bearing causing skidding. Bearings are made to tolerances of millionths of an inch. You would not throw sand in the engine, why is rust okay! It can also wear the other parts. The marks on the liner came from somewhere, you only show one side of the piston. The crank pin looks poor, should be in perfect condition, the rust probably made some of the wear. The parts are tinted from the oil being too hot, and those are just the parts you showed us. This does not mean the engine won't run fine, but it is far from perfect condition. I don't advocate honing cylinders, for one, you need to know the finish and the crosshatch pattern needed for the ring, also people dwell too long at the liner top and cause tapered cylinders just where you want the tightest fit.

Chris
10-18-2008 01:52 PM
 
 
Cowjock
Senior Heliman
Location: Collegeville, Pa.

Put the engine back together and run it. 9 gallons of fuel is not very much time on the engine. The rust on the bearing is not to bad, I've seen bearings with a lot more rust on than that still producing gobs of power.

Damn that ground is hard!
10-18-2008 02:20 PM
 
 
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Engines Plugs Mufflers Fuel > Inspect The Inside Of My Motor After 9 Gallons (Please Look)
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