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DIY: Roadster 2.5 PEM cleaning - step by step

Discussion in 'Roadster 2008-2012' started by m0rph, Jul 19, 2015.

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  1. scotty2541

    scotty2541 Member

    Joined:
    Mar 2, 2014
    Messages:
    195
    Location:
    Arlington, TX
    An AWESOME thanks for this. I just did it this morning.

    After shutting down the power, it took about 10 minutes for the voltage across the BAT +/- terminals to fall to under 2 volts. Must have been a lot of capacitors to bleed off.

    On my 2.5 the only difficulty was putting the PEM back in. Aligning it with the brackets that hold it from the left and right sides underneath, and with the 13mm bolts that go into the sides of the battery. That was a bit of manhandling.

    And my PEM underside looked clean, and nearly pristine. I was gonna ignore cleaning it, since I had already done the blowers underneath.

    Pem_smaller.jpg

    But even thought it looked clean, when I took a compressor to it at 80+psi, it blew a lot of dust out. So I'm glad I did blow it out even if it appeared that it didn't need it.

    With these instructions and a friend who used to service Hondas (but knows nothing about Tesla's) we got it knocked out is about 2 hours.

    Seriously, it's two person job, but it's easy!

    -Scotty
     
    • Like x 2
  2. coolVariable

    coolVariable Member

    Joined:
    Jan 15, 2018
    Messages:
    166
    Location:
    Los Angeles
    Did anyone ever post a step by step for cleaning the 1.5 PEM?
     
  3. coolVariable

    coolVariable Member

    Joined:
    Jan 15, 2018
    Messages:
    166
    Location:
    Los Angeles
    So I tried to get my 1.5 PEM off today, since my PEM has been overheating since I had it in for annual service with Javier.
    So much for letting a "pro" do it.
    I was progressing nicely until I got to the 13mm bolts that hold the PEM to the batter (one by the pump reservoir and one on the other side by the ground).

    I will try to quote one of the pics in this thread:

    What do people use to loosen these 13mm bolts that hold the PEM to the battery?
    A 13mm crescent wrench?
    I tried with an adjustable wrench but mine are on very tight and I am afraid of scratching the paint/carbon fiber around this area.
     
  4. hanknum

    hanknum Member

    Joined:
    Dec 7, 2018
    Messages:
    208
    Location:
    Santa Barbara
    Why in the world would you want to use a Crescent/adjustable wrench?

    Why not use a socket or box end wrench?
     
    • Like x 1
  5. warden_clyffe

    warden_clyffe Member

    Joined:
    Jun 16, 2015
    Messages:
    108
    Location:
    Germany
    we use 13mm ring-wrench spanner
     

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