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Thread: Refurbing a Very Early A/C System

  1. #41
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

    Posts:    1,321

    My VIN:    <2000

    Club(s):   (DCF)

    A/C Hub Adapter assembly

    While waiting for the compressor paint to cure, I assembled the pressure release valve (106918 ) and the high pressure switch (106917) onto the hub adapter (110527):


    I began removing 30 years of oxidation off the hub adapter using Mother's Mag & Aluminum polish, (or maybe it was raw aluminum anyway). I also replaced the Schrader valve in the high pressure switch fitting with a new one featuring neoprene seals. I think DMC already replaced it as the old one was the same as my new one. I used this "Slime" valve core tool (#20178 ) that clicks/releases when the valve is sufficiently tight:


    I also replaced the 3 O-rings with HNBR versions that I got from the same kit listed in an earlier post, soaking them in mineral oil first and using oil on the threads:


    Both switches tightened, and the polishing done. I used two small applications of the polish and just a bit of rubbing it in and off with a shop paper towel and it turned out better than I expected. Also, I think I'll find a suitable rubber plug for the hole in the top of the pressure release valve to keep water out of it:


    Other than that, this is ready to go on the car.
    Last edited by DMC-81; 10-12-2017 at 08:56 PM.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  2. #42
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

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    Finishing up Compressor

    I found this little nylon beauty plug locally at Ace Hardware to cover the hole in the top of the pressure release valve. That should stop water and dirt without impeding the function:


    The compressor paint is sufficiently cured, so I reassembled the front portion, clutch coil first. As before, the beveled side of the snap ring faces you:


    Pulley installed. I put some oil around the inside of the bearing race and tapped it in place using a rubber hammer. Then the snap ring:


    Next, I installed the 2 shims and then positioned the armature plate in place after putting a little bit of oil around where it presses onto the shaft. I used a 19 mm socket in the center and tapped it in place using a rubber hammer.


    I used OEM A/C Clutch Holding Tool ( part # 27000) and a 19mm socket to torque the armature nut to 25.5 ft/lbs. Then I checked the air gap. As Dennis mentioned earlier the spec is .016" to .031" . Mine was .025" :


    Compressor ready to be re-installed:
    Last edited by DMC-81; 10-15-2017 at 12:52 AM.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  3. #43
    Senior Member DMC5180's Avatar
    Join Date:  May 2011

    Location:  Reedsburg, WI

    Posts:    3,423

    My VIN:    5180

    Club(s):   (DMWC) (DCUK)

    Dana,

    It seems like you skipped over the part of piston and swash plate reassembly. Did you replace the Rings? I assume the pistons and cylinder bores showed no signs of wear.
    DENNIS

    VIN 5180, Frame 3652, STAGE I, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID sealed beam style headlights, SPAX user since 2009, Eibach springs, Mid-State Club Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, GENUINE MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.

  4. #44
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

    Posts:    1,321

    My VIN:    <2000

    Club(s):   (DCF)

    Quote Originally Posted by DMC5180 View Post
    Dana,

    It seems like you skipped over the part of piston and swash plate reassembly.
    Hi Dennis,

    Sorry, here is the piston & swashplate assembly ready to go back together. I re-assembled it by orienting the pinion and ball bearing with the 5 pistons closed in around it, then positioning the woodruff key and spring in the case, then carefully lowering the piston/swashplate assembly down in the case. It took half a dozen tries to get it seated so I could then position each piston in the cylinders. I lubed each part with mineral oil, applied by a clean artists brush:


    Here is the assembly installed in the original orientation:


    Quote Originally Posted by DMC5180 View Post
    Did you replace the Rings? I assume the pistons and cylinder bores showed no signs of wear.
    Although Sanden says the piston assembly cannot be refurbished ( i.e. rings, etc), you are correct that there was no scoring in either the bores or the pistons or any sign of wear. After the compressor was put back together, I turned the armature slowly by hand and I could feel a slight suction. I don't know how fast it has to move for there to be real suction for a test.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  5. #45
    Senior Member DMC5180's Avatar
    Join Date:  May 2011

    Location:  Reedsburg, WI

    Posts:    3,423

    My VIN:    5180

    Club(s):   (DMWC) (DCUK)

    Refurbing a Very Early A/C System

    Thanks for the added info.

    At some point this thread needs to be placed in the How To Section. Great detail write ups and photo documenting. Granted most folks would not go through the tear down like you have but still great stuff. It also takes a lot of the mystery out of what’s inside a typical A/C compressor.
    Last edited by DMC5180; 10-15-2017 at 08:58 PM.
    DENNIS

    VIN 5180, Frame 3652, STAGE I, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID sealed beam style headlights, SPAX user since 2009, Eibach springs, Mid-State Club Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, GENUINE MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.

  6. #46
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

    Posts:    1,321

    My VIN:    <2000

    Club(s):   (DCF)

    Quote Originally Posted by DMC5180 View Post
    Thanks for the added info.

    At some point this thread needs to be placed in the How To Section. Great detail write ups and photo documenting. Granted most folks would not go through the tear down like you have but still great stuff. It also takes a lot of the mystery out of what’s inside a typical A/C compressor.
    You're welcome, and thanks for the compliment. I hope that it is useful to anyone reading it.

    My next post will be flushing.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

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