RunRyder RC
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2072 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › 0s 55 head bolts
02-03-2010 03:00 PM  8 years agoPost 1
STUPINEER

rrApprentice

allen tx

My Posts: All  Forum  Topic

well boy and girls make sure you check your head bolts before you mount that pretty new motor. I could not weight last night about 11:30pm I had to fire up my new os 55 in my nwe vol 50. it started fast and easy I had to richen up the needles it was 39deg. Pulled it up into a hover and 30 secnds later it back fired and a autoed in. the head bolts were very loose. the piston hit the side of the head and took a chunck out of the piston.F**ck

If something hasn't broken on your helicopter, it's about to.'

PM  EMAIL  GALLERY  Attn:RR  Quote
02-03-2010 03:42 PM  8 years agoPost 2
bbaxter

rrApprentice

Central Illinois

My Posts: All  Forum  Topic

The piston cannot hit the cylinder head whether the head bolts are loose or tight, unless the head came completely off the top of the cylinder and was able to turn sideways.

PM  EMAIL  Attn:RR  Quote
02-03-2010 04:03 PM  8 years agoPost 3
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

My Posts: All  Forum  Topic

How did you mount the fan on that motor? Did you use a crank locking tool, or pushed the piston down through the glow hole?

It seems strange to me, logically there is NOTHING that can strike the piston, even with really stuffed up bearings.

I'm quite interrested now....... :-)

Concentrate on your weaknesses and your strengths will reward you!

PM  EMAIL  GALLERY  Attn:RR  Quote
02-03-2010 04:28 PM  8 years agoPost 4
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

I posted this in my thread about teh OS55, when I first got mine, I was one of the first to get "wild" motors. As in I'm not a rep, sponsored pilot etc..

I think it's generally just good practice to go through and check on ANY motor, OS/YS etc...

I also like to head up the head of my motor with a heat gun to allow parts to take in the heat and stretch a bit. That way when I give them a snug, they are going to stay snug when the motor heats back up and cycles etc...

I think the chunk of your motor missing is due to lean run from the head getting loose. Send it in for warranty and it may be covered. The head should have been on tight enough to run more than a few mins. I've heard of many motors going loose after many flights, but not this soon.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-03-2010 05:31 PM  8 years agoPost 5
STUPINEER

rrApprentice

allen tx

My Posts: All  Forum  Topic

all the head bols fell out and I had to find them in the drivway. when I pulled the motor the head fell off on the table. I also did use the crank locking tool.

If something hasn't broken on your helicopter, it's about to.'

PM  EMAIL  GALLERY  Attn:RR  Quote
02-03-2010 05:44 PM  8 years agoPost 6
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

ok this is very very important

Did you use the plastic tool that fits in BACK of the crank, or the metal tool that fits in the glow plug hole to lock the crank?

ps the back fire you heard was a lean detonation and probably the piston cracked then

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-03-2010 05:54 PM  8 years agoPost 7
STUPINEER

rrApprentice

allen tx

My Posts: All  Forum  Topic

the plastic tool that fits in BACK of the crank.

when i get home i will post some pic's

If something hasn't broken on your helicopter, it's about to.'

PM  EMAIL  GALLERY  Attn:RR  Quote
02-04-2010 04:31 PM  8 years agoPost 8
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

ok that should have been fine.
Head should have been tighter than that.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-04-2010 04:48 PM  8 years agoPost 9
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

Checking brand new engine bolts is like taking apart a heli that's partially built to check for loctite. It should be done on all engines. I take the head and backplate off to check for any foreign material.

Jeff

To hover is divine, the alternative is rather PLANE.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-04-2010 11:38 PM  8 years agoPost 10
Against Gravity

rrVeteran

Pottstown PA

My Posts: All  Forum  Topic

Loose Head Bolts
When I checked my new 55 over, I was able to tighten the head bolts by at least one and half turnes each. also had a stripped out backplate bolt, had to put a longer bolt in to fix that one.
OS's QC is getting bad.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 12:00 AM  8 years agoPost 11
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

I agree you should check Jeff, but really if they are that loose something is wrong with the assembly. Most people probably don't know to check. Only reason I do is b/c I've read of the OS50 Hyper heads coming loose. I don't remember seeing in the manual to check head bolt tightness. How are people to know unless they learn about it here, or read it in the manual. To my knowledge, it's not a pre-requisite to have internet or forum access, plus the ability to come across a thread like this; to buy and run a motor. They should be done right at the factory. I do double check myself and cinch them up. But I would expect the factory to have them assembled right, at least enough to run for many gallons w/out the head coming off.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 12:59 AM  8 years agoPost 12
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

Yeah I think they are pushing this stuff out at a rapid pace these days. It's difficult to get perfect quality control that way.

But it's like a lot of things that we learn about this hobby. Not all of it is in the manual nor is it written anywhere.

Is it in the manual to not start the heli at full throttle? I don't know about today's models but years ago it was in the manual. What do you know, I've started the dang things three times at full throttle.

Jeff

To hover is divine, the alternative is rather PLANE.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 01:17 AM  8 years agoPost 13
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

lol tru about teh hot start. If it's in the manual, don't do it, or wear a diaper lol.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 04:06 AM  8 years agoPost 14
STUPINEER

rrApprentice

allen tx

My Posts: All  Forum  Topic

I bought a new os55 today and guess what.
ALL the head bolts were loose!

WTF!

If something hasn't broken on your helicopter, it's about to.'

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 05:09 AM  8 years agoPost 15
STUPINEER

rrApprentice

allen tx

My Posts: All  Forum  Topic

PIC

If something hasn't broken on your helicopter, it's about to.'

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 08:22 AM  8 years agoPost 16
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

My Posts: All  Forum  Topic

Second photo shows clearly how the heat has melted the piston.
I think the lean running due to the head bolts comin loose is your answer.

I have re-torqued my Raptor's head bolts, thinking of it now. Like you would do with a car head. I actually made holes in the fan ducting to be able to check them in future.

Ouch, nice heli btw

Concentrate on your weaknesses and your strengths will reward you!

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 12:27 PM  8 years agoPost 17
SC Raptorman

rrVeteran

South Carolina

My Posts: All  Forum  Topic

Its a good idea to check all bolts on a new motor , I have found OS head bolts always alittle loose from my specs. Knock on wood I have never had one to come loose or burn the piston either.

Oh what a feeling 3D Flying can be
Magnum Fuels

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 12:37 PM  8 years agoPost 18
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

I would very clearly state when you send the motor back that you didn't know to check headbolts. That it ONLY ran a minute or so prior to stopping. That the headbolts were missing and the head fell off.
Clearly manufacturing issue. Now if it's covered will be the GREAT hobbico/hobbyservices mystery

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 04:03 PM  8 years agoPost 19
brcg123

rrKey Veteran

Wagoner OK USA

My Posts: All  Forum  Topic

how does loose head bolts have anything to do with melting a piston down? At the most, I would think you would lose compression and the engine would die, not melt down. The fact that you heard a pop, means you still had compression when it melted the piston. This is gonna be a hard one to prove its a warranty issue. Could someone please explain how this situation melts the head down. If your head bolts come loose on your car, it just wont start, because of no compression. It wont melt it down. the most it will do is leak antifreeze into the piston, and seize up, right?








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 04:31 PM  8 years agoPost 20
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

once the head loses seal you get an instant lean condition and the piston can get holed very easy in this case. Common problem IF a head comes loose to hole a piston.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2072 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › 0s 55 head bolts
 Print TOPIC  Make Suggestion 

 8  Topic Subscribe

Tuesday, November 13 - 1:05 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online