Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

M14P bent connecting rod

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Yak-List
View previous topic :: View next topic  
Author Message
richard.goode(at)russiana
Guest





PostPosted: Fri Feb 09, 2018 5:46 am    Post subject: M14P bent connecting rod Reply with quote

What typically happens is that because of the bending, the connecting rod become shorter and therefore pulls the piston further out of the cylinder. The oil control ring is close to the bottom of the piston, and will then jump out of its groove and attempt to prevent the piston going back up. Inevitably the ring then breaks, and a very obvious sign is high oil consumption and smoke appearing from that one cylinder; and plug fouling. And this can be established using a TDC tool, demonstrating that the one piston is not going as far up the cylinder as the others. But you don't have a lot of time before the rod will break, and then it flails around, typically damaging other cylinders!

Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW

Tel:  +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com

From: Mark Pennington [mailto:pennington.construction.inc.1(at)gmail.com]
Sent: 09 February 2018 12:18
To: Richard Goode <richard.goode(at)russianaeros.com>
Subject: M14P bent connecting rod

Richard


I fly a CJ with the M14P conversion and seeing that makes things pretty obvious how important pulling the prop through every time you start the engine really is.



With an engine in that condition would there be any tell-tale signs of a bent rod that could be noticed while operating the plane? Or is this a "silent" problem that just fails later.



I am new owner, only about a year and a half so any info would be appreciated.



Thanks

Mark Pennington

Richmond VA

[img]cid:image002.jpg(at)01D3A1AC.3033E2F0[/img]
Virus-free. www.avast.com
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List



image002.jpg
 Description:
 Filesize:  350 Bytes
 Viewed:  3271 Time(s)

image002.jpg


Back to top
Lancer



Joined: 21 Apr 2016
Posts: 30
Location: Cairns, Australia

PostPosted: Mon Mar 05, 2018 10:15 pm    Post subject: Re: M14P bent connecting rod Reply with quote

richard.goode(at)russiana wrote:
What typically happens is that because of the bending, the connecting rod become shorter and therefore pulls the piston further out of the cylinder. The oil control ring is close to the bottom of the piston, and will then jump out of its groove and attempt to prevent the piston going back up. Inevitably the ring then breaks, and a very obvious sign is high oil consumption and smoke appearing from that one cylinder; and plug fouling.


With the Housai Engine, when the rod bends to the point where the lower oil control ring pops out the bottom of the cylinder, the crankshaft counterweights start milling the bottom off of the piston contaminating the inside of the engine and the oil system with loads of tiny shards of aluminum. I'd say the M14 would also do the same.


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

_________________
You can run but you can't hide
Back to top
View user's profile Send private message
richard.goode(at)russiana
Guest





PostPosted: Tue Mar 06, 2018 2:22 am    Post subject: M14P bent connecting rod Reply with quote

I have no experience of the Chinese engine, but have seen serious engine
failure quite often with the M 14, and what seems to happen is that the oil
control ring breaks as a consequence of the bent and therefore somewhat
shorter connecting rod; the engine continues to run but with extremely high
oil consumption and after a few hours if no one has had the sense to examine
things, then the connecting rod breaks and causes mayhem. But I've never
seen - or more to the point noticed - damage on the bottom of the piston.

Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW

Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
--


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Yak-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group