Results 1 to 8 of 8

Thread: No oil pressure indication

  1. #1

    No oil pressure indication

    The dreaded no oil pressure on start up tonight. Engine start was
    normal and sounded fine during the short time that it ran. No leaks,
    drips (other than normal) or smell in the engine compartment. Recent
    annual indicated good compressions.

    Are the any checks a non mechanic can do.

    J Merrick
    8786 M
    M571
    -----------------------------------------
    This message was automatically imported from BAC-Mail or the Musketeer Mail list. Replies might not be seen by the original author.

  2. #2
    The quickest and easiest way to check is to 'Tee in' another oil pressure gauge in the cockpit pressure line; or to un-cowl the engine and connect a gauge at the engine port. If you connect at the engine fitting, you can easily run a piece of .041" or .032" safety wire into the restrictor fitting on the engine. You can also disconnect the gauge end in the cabin, and flush some solvent through the gauge line. If you fool with this on your own, make darn sure no wire winds up inside the engine.

    I doubt that you could make a case that this is legal non-A&P owner maintenance; and at any rate, if you are not familiar with what you are doing and why, you can make quite a mess during these diagnostics.

    The good news is that this is far more likely to be a clogged restrictor fitting, clogged pressure line, or bad gauge; as opposed to actually having no oil pressure in the engine. The latter is highly unlikely, but certainly not impossible.

  3. #3
    Guest
    Guest

    No oil pressure indication

    Hi,
    Looks like you have the IO-346. I had a no oil pressure start with no other problems just like yours. We found it to be a small tag end of safety wire had been picked up by the sump and run through the oil pump then lodged in the pressure relif valve dumping the majority of the oil babk into the sump.

    The oil pump is mounted on the outside of the engine at the rear of the case, can be removed after paying the price of skinned knuckles. You should have a mech with you on this.
    Depending on what you find, you might get away with anything from a flush & go to an overhaul. I was at TBO , so I did an overhaul.

    Blue Skies

    Al Todd Use to own 8770M, 9321 S

    -----------------------------------------
    This message was automatically imported from BAC-Mail or the Musketeer Mail list. Replies might not be seen by the original author.

  4. #4

    No oil pressure indication

    Went out this morning and took off the oil pressure hose at the
    firewall and fed into a bottle.

    Started normally but no oil fed into the bottle from the oil pump.
    Engine sounded totally normal.

    Took the entire line off at both connections and blew through it. No
    residual oil comes out.

    Right side of engine is dry. More oil on left. Oil at hose
    connections to oil pump and cooler.

    I think I will remove the oil pump and see what it looks like.

    Hope this not a bad one ($)

    Looking possibly for overhaul shops

    J Merrick

    8786M
    -----------------------------------------
    This message was automatically imported from BAC-Mail or the Musketeer Mail list. Replies might not be seen by the original author.

  5. #5

    No oil pressure indication

    Test the guage at the oil pressure sender hose. Usually on the
    Lycoming, this line is at the accessory case next to the right isolator
    mount. It doesn't have to be a great connection, just enough to hold
    50psi. Then, with an assistant, put 25-50 psi of compressed air (use a
    regulator to avoid damage) into the hose and see if the guage moves. If
    the guage does work, then your in for some fun. Drain the oil strain,
    it through a paint filter or something and cut open the filter, and
    inspect the suction screen (usually in the sump on the rear right side
    under a plug that is about an inch + in diameter. The suction screen
    will require a new crush gasket. Check for debris especially magnetic
    type. It is normal to have a few small aluminum flakes and depending on
    how much you fly, carbon chunks. If you have lots of metal, especially
    magnetic, call your mechanic, and save the filter media and debris from
    the suction screen. Did you have engine work recently? Could there be
    paper towel in the sump? Good job paying attention to your gauges.

    Joe
    -----------------------------------------
    This message was automatically imported from BAC-Mail or the Musketeer Mail list. Replies might not be seen by the original author.

  6. #6

    No oil pressure indication

    Don't decide to remove the oil pump lightly. It is a real problem to get it off and an even bigger problem to get it back together without leaks. I assume you have a Continental engine. These don't have the problems that the Lycomings do.
    -----------------------------------------
    This message was automatically imported from BAC-Mail or the Musketeer Mail list. Replies might not be seen by the original author.

  7. #7
    Joe Merrick, before you screw with the oil pump, PLEASE re-read my first post. You have made no mention of clearing the restrictor fitting on the engine end of the oil gauge line. You also said no oil came out of the gauge line, but you did not indicate whether air went through it. Please make sure that the restrictor fitting is clear, before doing anything more extensive on the engine. After running some wire into it, make sure you can blow air into the fitting.

    You need to exhaust all the other possible culprits before suspecting the oil pump. It is very rare for an oil pump to just stop pumping altogether; it would require a structural failure in the drive to make that happen.

  8. #8
    Posted by Joe Merrick on June 12, via BAC-Mail:

    Posted: Jun 12, 2007 - 09:18 PM
    --------------------------------------------------------------------------------
    Went back out to plane again. Removed the oil pressure hose from the
    firewall after not having any indication on the gauge.

    Put the hose in my mouth and blew back into the engine. Heard
    two "glup glups".

    Removed the entire hose from the engine end and wrapped the nozzle in a rag. Started the plane for 15 seconds. Re- checked and saw oil all
    over the place. Even blew through the rag.

    Re connected hose and there you go: Oil Pressure! Ran for 15 minutes
    and everything appears normal. Will change oil and have mechanic look
    things over.

    Thank you for all of your comments.

    J. Merrick

Similar Threads

  1. Music over Nav frequency trouble no CDI indication
    By Chas in forum Musketeer-Mail Archive
    Replies: 1
    Last Post: 04-25-2006, 02:19 AM
  2. Discharging Battery Indication
    By Rellihan in forum Musketeer-Mail Archive
    Replies: 1
    Last Post: 07-04-2005, 07:23 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO