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M14P bent connecting rod

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richard.goode(at)russiana
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Posted: Fri Feb 09, 2018 5:46 am Post subject: M14P bent connecting rod

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

 

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Joined: 21 Apr 2016
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Location: Cairns, Australia

Posted: Mon Mar 05, 2018 10:15 pm Post subject: Re: M14P bent connecting rod

 	  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.

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richard.goode(at)russiana
Guest

Posted: Tue Mar 06, 2018 2:22 am Post subject: M14P bent connecting rod

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

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