Lycoming O-540 Engine model question

Discussion in 'Maintenance Bay' started by DKirkpatrick, Jul 3, 2019.

  1. DKirkpatrick

    DKirkpatrick Pre-takeoff checklist

    Joined:
    May 18, 2011
    Messages:
    214

    Display name:
    DKirkpatrick
    Hi,
    Looking at a nice older Piper 235. Has a nice older Lycoming O-540 B4B5... If I should find a Lycoming O-540 A1D5 replacement engine, from a Comanche, can that go into the Piper 235? Can that engine be modified to the BRB5? Thanks in advance for the coaching.
     
  2. kyleb

    kyleb Final Approach PoA Supporter

    Joined:
    Jun 13, 2008
    Messages:
    6,257
    Location:
    Marietta, GA

    Display name:
    Drake the Outlaw
  3. Clip4

    Clip4 Final Approach

    Joined:
    Jun 27, 2013
    Messages:
    6,819
    Location:
    A Rubber Room

    Display name:
    Cli4ord
    Why do you want to do this?
     
  4. DKirkpatrick

    DKirkpatrick Pre-takeoff checklist

    Joined:
    May 18, 2011
    Messages:
    214

    Display name:
    DKirkpatrick
    Thanks for your help with this. Will do my homework
    dan
     
  5. Tom-D

    Tom-D Taxi to Parking

    Joined:
    Feb 23, 2005
    Messages:
    34,736

    Display name:
    Tom-D
    No this can't be done,, the rules governing the swapping of data tag prohibits it.
    different engine requires an Approval of some sort. (STC, or Field approval)
     
  6. Tom-D

    Tom-D Taxi to Parking

    Joined:
    Feb 23, 2005
    Messages:
    34,736

    Display name:
    Tom-D
    The manufacturer can rebuild any engine to any configuration they choose and issue a new data tag.
     
  7. charlie

    charlie Pre-takeoff checklist

    Joined:
    Feb 23, 2005
    Messages:
    255
    Location:
    zephyrhills FL and harbour island Bahamas

    Display name:
    Charlie
    Tom is correct as usual. Back before about '86 the factory would allow conversion of engines and provide a modified data plate for the "new" model engine. We had to submit to them a list of the changed parts. G & N was doing that several times a month. The straw that broke the camel's back came when we converted a pair of TIO_540-A2C engines to IO-540-M1A5's that were installed in a new Evangel aircraft. The parts change list was seriously long. Lycoming was really unhappy because they cancelled their order for Factory M1A5's because Lycoming union workers was were on strike. Not to be outdone we applied for and received an approval to do the conversions and modify the data plates under a process specification on the shop's FAR 145 repair station certificate. Penn Yan later received the same approval. I was there!
     
    GRG55 likes this.
  8. JAWS

    JAWS Cleared for Takeoff

    Joined:
    Oct 7, 2016
    Messages:
    1,171

    Display name:
    JAWS
    I once changed an O-320 from a Cherokee to a 172. Swapped the accessory cases and guts (fuel pump plunger) and prop flange bushings and probably a few other things. Used the IPC's and got permission from Transport Canada. One of their requirements was to remark the data plates as applicable and continue the logs (no swapping).

    It was a lot of work, but was doable at that time. I would have to be convinced (a lot) to go through the hassle today, if it would even be applicable to the OP's models.