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Snazpappy
Joined: 01 Jan 2019
Posts: 33
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 Posted: Mon May 31, 2021 9:40 pm Post subject: Spark Plug Inserts |
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I have some loose spark plug inserts on my M-14PF and wondering what the best fix is? I am hoping it is a field repair I can do myself. I already texted my M-14/Yak savant Dennis Savarese, and hope to get more input from everyone.
Thanks
Todd
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richard.goode(at)russiana
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| Posted: Mon May 31, 2021 11:16 pm Post subject: Spark Plug Inserts |
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Unfortunately there is no "field repair" for this quite common problem. The cylinder needs to go to a good machine shop; remove the loose insert; enlarge and make new threads in the cylinder and similarly machine a larger insert. And it should be inserted with an interference fit with the cylinder hot and the insert cold when assembling.
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
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GeorgeCoy
Joined: 02 Dec 2010
Posts: 310
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| Posted: Tue Jun 01, 2021 5:02 am Post subject: Spark Plug Inserts |
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Todd,
Richard is correct, that the cylinder must be removed to be
repaired. Attached are service instructions for the replacement. We also can
supply the oversize bushings and oversize checking pins.
The cause of the bushings loosening is usually over torquing of the spark
plugs, removing and installing while the engine is hot or and lack of
antiseizure compound when installing spark plugs.
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Replacement_spark_plug_bushing.doc |
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Snazpappy
Joined: 01 Jan 2019
Posts: 33
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| Posted: Tue Jun 01, 2021 6:58 am Post subject: Re: Spark Plug Inserts |
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Thanks guys, same thing Dennis recommends. Can a guy get away with flying it to a shop for the repairs?
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richard.goode(at)russiana
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| Posted: Tue Jun 01, 2021 7:36 am Post subject: Spark Plug Inserts |
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That is an interesting question! The bottom line is that the insert would definitely blow out of the cylinder at a stage, and then of course you will have a jet of hot exhaust, of course ignited by the other sparking plug blowing out. But if you're talking about a 20 minute flight back to base, it is probably a gamble worth taking!
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
--
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Snazpappy
Joined: 01 Jan 2019
Posts: 33
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| Posted: Wed Jun 02, 2021 9:20 am Post subject: Re: Spark Plug Inserts |
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I am looking at a rebuilt engine but if I were to take off a couple cylinders where would you guys recommend me sending them in to, to be resleaved for the spark plug inserts? Talked to Rhonda at Barrett they have the EO and parts but have not done one yet, Also not sure what ring set up I have for the pistons will these parts be readily available and through who?
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dsavarese0812(at)bellsout
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| Posted: Wed Jun 02, 2021 10:47 am Post subject: Spark Plug Inserts |
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The cylinder does not have to be “sleeved”. Just replace the spark plug inserts.
Dennis
Sent from my iPhone
| Quote: | On Jun 2, 2021, at 1:23 PM, Snazpappy <snazman1(at)hotmail.com> wrote:
I am looking at a rebuilt engine but if I were to take off a couple cylinders where would you guys recommend me sending them in to, to be resleaved for the spark plug inserts? Talked to Rhonda at Barrett they have the EO and parts but have not done one yet, Also not sure what ring set up I have for the pistons will these parts be readily available and through who?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502207#502207
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Snazpappy
Joined: 01 Jan 2019
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