RunRyder RC
 2  Topic Subscribe
WATCH
 1 page 551 views POST REPLY
HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Broken Connecting Rod
11-06-2004 11:36 PM  13 years agoPost 1
korzry

rrApprentice

Fort Collins, CO

My Posts: All  Forum  Topic

I bought an OS61 SXH-WC from a friend recently. Not sure how much time was on it. It sounded like it siezed in flight. After removal of the back plate it was obvious. The bottom of the connecting rod where it connects to the crankshaft disintegrated. It was broken into at least 4 seperate pieces. What might have caused this?

Ryan

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
11-07-2004 01:35 AM  13 years agoPost 2
Doug

rrElite Veteran

Port Saint Luice Florida....

My Posts: All  Forum  Topic

The piston siezed and the crank just pulled the rod apart

First member of Member of Bearings Anonymous

PM  EMAIL  GALLERY  Attn:RR  Quote
11-08-2004 04:50 AM  13 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Not enough oil content -- the bronze bushing in the rod goes south, the rod breaks.

Too lean, oil breaks down, no lube. The bronze bushing in the rod goes south, the rod breaks.

Over revving the engine (too many rpm), the con rod ends stretch, then break.

Your friend may have fried the engine prior to selling it to you.

I lost two con rods in an OS 32 this summer. Bottom end disintegrated both times. My guess is that I was too lean at the time. First time it was me -- too lean, second time, it was OS -- they repaired the engine under warranty, replaced all moving parts except the crankshaft. The conrod journal though smooth, had ridges in it from when the first rod blew.

They replaced the entire engine the second time I sent it back, telling them that they should have replaced the crank first time around..

Dave

PM  EMAIL  GALLERY  Attn:RR  Quote
11-16-2004 04:06 AM  13 years agoPost 4
TurboStew

rrApprentice

Ft Collins, CO

My Posts: All  Forum  Topic

You fly'in the He!! out of it!

8.5 pound 90 birds Rock!

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 551 views POST REPLY
HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Broken Connecting Rod
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Friday, June 22 - 5:09 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online