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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Help, Cant get engine to turn over.
07-19-2006 05:23 AM  14 years ago
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Chickenx10

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Ft Drum NY

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Help, Cant get engine to turn over.
i am trying to start my os 50 hyper for the first time, in my new titan. I go to try and start it but its hyrdro locked, so i fix that and then i go again and it starts up and idles for 20 seconds, i add a little throttle and it dies. Now when i try to start it the starter will not turn the motor at all. i did not fry it, but i cannot find a problem, anyone have any sugestions? its not hydrolocked, and i have tried different 12v batteries so my battery isnt dead
Raptor 50 Titan / OS 50 Hyper / GY401 w/ 9254
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07-19-2006 05:31 AM  14 years ago
Rappy30

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This is going to suck.
Drop the motor and pull the carb off
Pull the spark plug -- Will it turn now?
Take off the head -- Will it turn now?
Take off the backplate -- look for debris, also inspect the rear bearing, look for problems like missing bearings, bebris in the bearing track, etc.
remove the fan (maybe on to tight?)

If it still won't turn your piston is probably not square with the cylinder wall (jammed).

If that is the case take the engine to where you bought it or send it in to hobby services. You will probably need a piston, sleeve, and ring if it is indeed jammed.
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07-19-2006 05:40 AM  14 years ago
Chickenx10

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i just took motor out of the frame, i spun the fan part, and it was stick ( not moving ) so i twisted it harder and it popped loose, now its spinning great but, the lower boss on the connecting rod is rubbing on the crank case in one area, im guessing this should wear in ?Raptor 50 Titan / OS 50 Hyper / GY401 w/ 9254
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07-19-2006 05:45 AM  14 years ago
gkoutsis

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the lower boss on the connecting rod is rubbing on the crank case in one area, im guessing this should wear in ?
Put everything back together and send it back where you bought it from.....
George
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07-19-2006 05:45 AM  14 years ago
TMoore

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No, it sounds like the fan hub isn't tight on the engine. Time for a do-over.

TM
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07-19-2006 05:45 AM  14 years ago
Chickenx10

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well this was the very first tank, everythings really tight right nowRaptor 50 Titan / OS 50 Hyper / GY401 w/ 9254
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07-19-2006 05:48 AM  14 years ago
TMoore

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Pull the clutch off, take the fan hub off and pull the backplate and if the engine doesn't turn over freely with the clutch and fan off there is something else amiss.

TM
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07-19-2006 05:49 AM  14 years ago
Rappy30

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Hold the engine in one hand, the fan in the other, and pull them apart....do they move? If they do then get someone to help you install the fan correctly, if not can you take a picture of where it is rubbing and post it.
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07-19-2006 05:54 AM  14 years ago
Chickenx10

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ok i checked the fan and everything, its all good. So we took open the crank case with the 4 screws. and when you spin it, the little thing goes around along the frame in that groove. In one part, it rubs on the side of the motor. Im going to go to a tank of gas idling and see if it just had to be worn in. Sorry i dont have the cable to connect my camera to the computerRaptor 50 Titan / OS 50 Hyper / GY401 w/ 9254
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07-19-2006 06:03 AM  14 years ago
dkshema

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Not familiar with the specifics of the clutch/fan/start shaft setup on the Raptor, and looking at the assembly manual, there is no OS Hyper 50 specific information.

But I'll ask the question anyway, for future reference and knowledge:

Are you supposed to leave the large black steel washer that comes with the 50, in its place between the front bearing and the rest of the clutch assembly, or are you supposed to remove that washer before putting the clutch stack together?

If you need it, and it isn't there, that could lead to the kind of trouble you had.

Dave
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07-19-2006 06:08 AM  14 years ago
dkshema

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In one part, it rubs on the side of the motor. Im going to go to a tank of gas idling and see if it just had to be worn in
When you get done with that tank of fuel, you may proceed to remove your motor and toss it in the trash can, as you will have pretty much destroyed the rear bearing, the crankcase, the bottom end of the connecting rod, the con rod journal on the end of the crankshaft, a piston, ring, and cylinder. You might be able to salvage the head. The bits of metal will probably take out your glow plug, and end up in your muffler, only to confound you on the next motor you install.

If you have installed the fan, clutch, and flywheel correctly, with the backplate removed, NO parts of the motor should be rubbing each other as you describe. Running the motor in that condition will destroy it.

Dave
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07-19-2006 06:19 AM  14 years ago
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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If you have the motor in your hand , with the glow plug out. There should Be NO GRINDING WHAT SO EVER. When you turn it over. If there is, your motor has big problems. If the motor is new, it has a warrenty with it.If you bought it used, then you should be talking to who you bought it from. If you took the back plate off and there was any debrie in the motor or ware marks or grooves in the case. The motor has problems. It should turn over freely with no rubbing at all. It's not worth tring to fly if any of these conditions apply. You have a chance of loosing the heli.
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07-19-2006 06:32 AM  14 years ago
Chickenx10

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dkshema you were right, when the engine was tightened into the frame the clutch was pushed up tight againbst the housing and it was putting force on the end of the crankshaft and putting the engine in a bind. We were able to reposition the engine cradle to eliminate the problem.Raptor 50 Titan / OS 50 Hyper / GY401 w/ 9254
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07-19-2006 07:20 AM  14 years ago
JamesonMalpezzi

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TAKE THE BLACK WASHER OFFF ! IT WAS MESSING MINE UP BUT I TOOK IT OFF AND IT RAN FINE !
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07-19-2006 07:33 AM  14 years ago
Chickenx10

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you mean that black shim by the clutch?Raptor 50 Titan / OS 50 Hyper / GY401 w/ 9254
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07-19-2006 07:40 AM  14 years ago
JamesonMalpezzi

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Yes that little bugger.
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07-19-2006 07:51 AM  14 years ago
Chickenx10

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i took out the shim, it helped a little, but if i were to put in the engine mount screws it would still force the motor out. Im just going to make the screw holes larger in the metal piece that goes around the motor so i can drop it down slightlyRaptor 50 Titan / OS 50 Hyper / GY401 w/ 9254
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07-19-2006 07:54 AM  14 years ago
JamesonMalpezzi

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Make sure you also have the right engine mount, i had a OS and TT one and i mixed them up and it didnt work out so make sure its a OS mount. heliproz sells them. and another washer that may help you...its some kind aof clutch washer for the hyper....email erick about it..
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07-19-2006 08:00 AM  14 years ago
Rappy30

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Engine mount
I had a problem fitting my hyper into the OS engine mount. The lower two screw casings on the outside of the hyper would touch the engine mount when screwed in fully, this gave a sligh rear high angle to the engine. Using a dremel and a grinding stone I was able to clean a little material from the mount to get the engine to sit nice a flat.

Chickenx...you should not modify a 200$ motor to fit a 30$ mount...that is bass ackwards. Find the problem with the mount and fix it there.

Also, the others are correct, if the con rod is rubbing do not run that engine.

Out of curiousity, how are you tightening the fan to the crank. What I mean is how are you locking the crankshaft when you screw on the fan?

Finally, Do not use the washer that the engine comes with behind the fan, it is not needed.
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07-19-2006 08:03 AM  14 years ago
JamesonMalpezzi

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Well put rappy30
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