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IO-240B With the 15V 60A TCM alternator

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Keith.Miller(at)esa.int
Guest

Posted: Sun Jul 29, 2012 10:34 pm Post subject: IO-240B With the 15V 60A TCM alternator

At 450hrs the drive coupling on my alternator has failed ,  maybe its just

coincidence   with  the experience of Tim last year where his failed at

around the same number of hours , I stripped it out yesterday and  it is the

same elastomeric one piece  assembly.

Question : Tim or anyone else  , what was your opinion of the Drake

rebuild  , how long  did it take and any contact details.

Keith

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  |Keith.Miller(at)esa.int                                                                                                                                  |

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  |kis-list(at)matronics.com                                                                                                                                |

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  |04/03/2011 11:23                                                                                                                                      |

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  |Re: IO-240B With the 15V 60A TCM alternator                                                                                                 |

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  |owner-kis-list-server(at)matronics.com                                                                                                                   |

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Hopefully mine will last a bit longer , but good to know that  there are some

options

  From:       "helixaviation(at)googlemail.com" <helixaviation(at)btinternet.com>

  To:         kis-list(at)matronics.com

  Date:       04/03/2011 11:11

  Subject:    Re: IO-240B With the 15V 60A TCM altinator

  Sent by:    owner-kis-list-server(at)matronics.com

Keith. My alternator drive coupling failed after about 50 hours. I put it

down to kickback on startup and had the mags retarded a little. The original

coupling was elastomeric and had failed in sheer. I managed to locate an

alternative style that was mechanical but has rubber inserts for shock

absorbtion. I got it second hand and from memory only cost about £100. John

--

Sent from my Android phone with K-9 Mail. Please excuse my brevity.

Keith.Miller(at)esa.int wrote:

  want to hear , my IO240B is just coming up to 400hrs , but thanks for

  sharing it with us anyway , at least the shock will be less when it

  eventually happens to mine Keith From: "F. Tim Yoder"

  <ftyoder(at)yoderbuilt.com> To: <kis-list(at)matronics.com> Date: 04/03/2011

  04:09 Subject: IO-240B With the 15V 60A TCM altinator Sent by:

  owner-kis-list-server(at)matronics.com FYI, I was fly a couple weeks ago and

  lost The Alt. I determined that the Alt. was not producing power and

  removed it. I am sure Cont. could have made that job harder if they tried.

  I found the Alt. was ok but the Alt. Drive Coupling Assembly (P/N 635796)

  was broken, the Lord rubber mount came loose from the ss shroud. Better if

  the Alt was bad. The bad news is that Cont. wants $2077.00 for this part,

  no, the engine is not included! The not so bad news is that Drake rebuilds

  them and they can be had for $600.00 to $900.00, with a good core. I only

  had a little over 400 hrs. on the engine. I had to remove a Slick Mag to

  get the Alt. out, so I had the mag 500 hr service done. New points and

  replaced a bad gear. So for only a $1000.00 + I now have lots of amps &

  volts. Hope you have the "good" ones!

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ftyoder(at)yoderbuilt.com
Guest

Posted: Mon Jul 30, 2012 4:38 am Post subject: IO-240B With the 15V 60A TCM alternator

Keith,

Sorry to hear about that. A local FBO had one in stock so I wasn't down 

long. They just cost to damn much. If you price a new one you will be glad 

to get a rebuilt one . You might check with a mechanic about the 

possibility of converting to the old geared system. Maybe OC has an idea if 

that is possible or affordable.

Good luck, Tim

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Keith.Miller(at)esa.int
Guest

Posted: Mon Jul 30, 2012 5:00 am Post subject: IO-240B With the 15V 60A TCM alternator

Tim



I have started to look into the possibilities of switching to the old style

mechanical  coupling, But I wonder if there were any good   reasons why TCM

switched to the Elastomeric type,Did they have in field failures, or was it

simply to  protect a 600$ alternator  with a 2000$ coupling .



also I am wondering why it failed ?   My alternator is spinning freely  so it

wasn't due to  this,

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  |"F. Tim Yoder" <ftyoder(at)yoderbuilt.com>                                                                                                               |

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  |<kis-list(at)matronics.com>                                                                                                                              |

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  |30/07/2012 14:39                                                                                                                                      |

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  |Re: IO-240B With the 15V 60A TCM alternator                                                                                                 |

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  |owner-kis-list-server(at)matronics.com                                                                                                                   |

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Keith,

Sorry to hear about that. A local FBO had one in stock so I wasn't down

long. They just cost to damn much. If you price a new one you will be glad

to get a rebuilt one . You might check with a mechanic about the

possibility of converting to the old geared system. Maybe OC has an idea if

that is possible or affordable.

Good luck, Tim

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ftyoder(at)yoderbuilt.com
Guest

Posted: Mon Jul 30, 2012 6:26 am Post subject: IO-240B With the 15V 60A TCM alternator

My alternator was also good. One of the local mechanics also wondered why 

went to the bonded coupling. His experience was few failures of the gear. 

One of the gears is designed to fail before damaging the alternator, is the 

way I understand it.



Tim

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Keith.Miller(at)esa.int
Guest

Posted: Mon Jul 30, 2012 6:45 am Post subject: IO-240B With the 15V 60A TCM alternator

Just spoke with Drakes  representative and he said the most common cause of

failure was too high a load on the alternator immediately after start up

since this is when  the  alternator is   running slow, Or if a large  load is

suddenly put on the alternator  in flight . He said they get a few  in for

refurbishment every week, particularly in the summer when owners are

switching on the airco  before start up  ( are they battery operated ? ) ,

Clearly  this is not my problem ( particularly in  the cold Europe this

summer  we have had )  but this has got me thinking and maybe its the lithium

Ion battery I installed earlier this year , immediately after startup it

draws very large currents  which drop almost immediately  ( these batteries

go from zero to  fully charged in 15 mins ).  It may have nothing at all to

do with this.



Keith

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  |"F. Tim Yoder" <ftyoder(at)yoderbuilt.com>                                                                                                               |

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  |<kis-list(at)matronics.com>                                                                                                                              |

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  |30/07/2012 16:27                                                                                                                                      |

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  |Re: IO-240B With the 15V 60A TCM alternator                                                                                                 |

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  |owner-kis-list-server(at)matronics.com                                                                                                                   |

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My alternator was also good. One of the local mechanics also wondered why

went to the bonded coupling. His experience was few failures of the gear.

One of the gears is designed to fail before damaging the alternator, is the

way I understand it.



Tim

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