Oil line from engine block leak

Discussion in 'Wrenchin' Secrets' started by Jollygood, May 31, 2018.

  1. Jollygood

    Jollygood Well-Known Member

    just finished throwing my engine back in the car. I’ve got the typical oil drip from the brass fittings to the oil pressure gauge. I’ve broken two brass couplers trying to cinch it down and have yet to solve the leak. I haven’t used any type of sealant on the threads as I wouldn’t expect it would need any. Has anyone had this issue and solved it? I know...Buick’s leak... but I’m stubborn.

  2. buick64203

    buick64203 Just plum crazy Staff Member

    Are you sure its leaking from the compression fitting? Might be leaking from the threads going into the block. Don't use Teflon tape though. Get some pipe dope and apply it sparingly to the threads on the fitting going into the block
    sailbrd and JoeBlog like this.
  3. JoeBlog

    JoeBlog Platinum Level Contributor

    +1 on the pipe dope. I put in new dial gauges and had that issue. I don’t have that issue any more...
  4. steve covington

    steve covington Well-Known Member

    Pipe sealant with teflon (PST) available in a small tube at most parts stores...
    (Yeah, pipe dope)
  5. Jollygood

    Jollygood Well-Known Member

    Ok, I’ll give that a shot, I’ve got some on hand I’ve just heard counter arguments. I’ve also heard to use permatex copper gasket sealant. Either way, I’ll try one then the next should the first fail and will post my results. Thanks all
  6. Bluzilla

    Bluzilla a.k.a. "THE DOCTOR"

    I had a 3/8" NPT tap break a tooth while tapping my current block. Ended up "Deep Tapping" and will be using this sealant.

    LOCTITE 545
    (Known as Loctite 545 Thread Sealant Hydraulic/Pneumatic Sealant
    High lubricity thread sealant for locking and sealing metal pipes and small fittings with fine threads.

    LOCTITE® 545 is a pipe thread sealant designed for locking and sealing of metal pipes and fittings. It is specially formulated to offer high lubricity for easy assembly and removal. Recommended for fine threaded fittings as used in hydraulic and pneumatic installations and small fittings in general. Suitable for fittings up to 50 mm in diameter including pneumatic and hydraulic fittings.

    Jollygood likes this.
  7. Jollygood

    Jollygood Well-Known Member

    went on a Sunday cruise after trying the PTFE pipe dope and it’s now dry as a bone! Thanks all! Now if I could only figure out where all this rubber in the rear wheel wells keeps coming from....
  8. sailbrd

    sailbrd Well-Known Member

    That is "tire pollen." It goes away after the first snow.

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