Commander-List Digest Archive

Wed 10/14/15


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 05:38 PM - Commander 500S oil pressure (N202JH)
     2. 06:58 PM - Re: Commander 500S oil pressure (William Boelte)
     3. 07:24 PM - Re: Commander 500S oil pressure (N202JH)
 
 
 


Message 1


  • INDEX
  • Back to Main INDEX
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 05:38:04 PM PST US
    From: N202JH <n202jh@GMAIL.COM>
    Subject: Commander 500S oil pressure
    Good Evening, My boss has a Commander 500S. Right engine runs perfect oil pressure in flight. It matches the left engine within one PSI. However, the right engine does something strange between cold and hot engine core temperatures. First start of the day, cold engine, you get an initial high oil pressure as expected with cold oil. But it is very high, over 90 PSI. The left engine i s only around high 80s. Right engine oil press comes down as expected after the engine warms. We take off and in cruise, both pressures are matched +/- 1 PSI. After landing, the right engine oil pressure is very low, below bottom redli ne. If I were to do a feather check at this point, the prop recovery time is ver y long confirming low oil pressure. My mechanic replaced the ball and spring for the "oil pressure maintaining v alve", if that term is correct, and honed out a fresh seat for the ball. No change to the oil pressure behavior I listed above, Any ideas? Regards, Derek Groves Midas Air Corp Groves Aviation Inc. Dgroves484@gmail.com (954) 240-1383 Derek Groves Midas Air Corp Groves Aviation Inc. N202JH@gmail.com (954) 240-1383 Sent from my iPad


    Message 2


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 06:58:13 PM PST US
    Subject: Re: Commander 500S oil pressure
    From: William Boelte <n55bz@cox.net>
    I believe that there are springs with different rates available for the oil p ressure regulator assembly. They are painted different colors- white, yellow and green, if I remember correctly. Washers are placed into the oil pressur e regulator on top of the spring to set the minimum oil pressure and the dif ferent springs are used to set the max. The condition of the steel ball and t he ball seat is critical- just a little surface rust on the ball or a minute scratch on the seat can result in very low oil pressure. When changing any components of the oil pressure regulator be careful to rem ove all of the washers inside the spring housings before the initial start. I did not do this on one occasion and after replacing the ball and refacing the seat blew out the oil cooler about the time that the oil pressure needl e reached the end of the scale. It was amazing how rapidly the oil pressure r ose. I believe that there are adjustable oil pressure regulators which do not use washers to adjust the pressure. Kindest regards, Bill > On Oct 14, 2015, at 7:36 PM, N202JH <n202jh@GMAIL.COM> wrote: > > Good Evening, > > > My boss has a Commander 500S. > > Right engine runs perfect oil pressure in flight. It matches the left engi ne within one PSI. > > However, the right engine does something strange between cold and hot engi ne core temperatures. > > First start of the day, cold engine, you get an initial high oil pressure a s expected with cold oil. But it is very high, over 90 PSI. The left engine i s only around high 80s. > > Right engine oil press comes down as expected after the engine warms. > > We take off and in cruise, both pressures are matched +/- 1 PSI. > > After landing, the right engine oil pressure is very low, below bottom red line. > > If I were to do a feather check at this point, the prop recovery time is v ery long confirming low oil pressure. > > My mechanic replaced the ball and spring for the "oil pressure maintaining valve", if that term is correct, and honed out a fresh seat for the ball. > > No change to the oil pressure behavior I listed above, > > > Any ideas? > > Regards, > > Derek Groves > Midas Air Corp > Groves Aviation Inc. > Dgroves484@gmail.com > (954) 240-1383 > > Derek Groves > Midas Air Corp > Groves Aviation Inc. > N202JH@gmail.com > (954) 240-1383 > > Sent from my iPad > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >


    Message 3


  • INDEX
  • Back to Main INDEX
  • PREVIOUS
  • Skip to PREVIOUS Message
  • NEXT
  • Skip to NEXT Message
  • LIST
  • Reply to LIST Regarding this Message
  • SENDER
  • Reply to SENDER Regarding this Message
    Time: 07:24:28 PM PST US
    From: N202JH <n202jh@GMAIL.COM>
    Subject: Re: Commander 500S oil pressure
    Hi Bill nice to speak to you again, The temps are close to even on both...the low pressure side may be a bit hig her but I believe that is a result of the low oil pressure situation. Low o il pressure can bring high temps too I believe. In cruise, all temps and pressures match each other rather close. Regards, Derek Groves Midas Air Corp Groves Aviation Inc. N202JH@gmail.com (954) 240-1383 Sent from my iPad > On Oct 14, 2015, at 9:04 PM, BillLeff1 <BillLeff1@aol.com> wrote: > > What is the oil temp when the pressure is low. How does it compare to the o ther engine. Also, is the CHT high on that engine? Any metal in the screen o r filter? > > Bill Leff > > > > Sent from my Verizon Wireless 4G LTE DROID > On Oct 14, 2015 8:36 PM, N202JH <n202jh@GMAIL.COM> wrote: > Good Evening, > > > My boss has a Commander 500S. > > Right engine runs perfect oil pressure in flight. It matches the left engi ne within one PSI. > > However, the right engine does something strange between cold and hot engi ne core temperatures. > > First start of the day, cold engine, you get an initial high oil pressure a s expected with cold oil. But it is very high, over 90 PSI. The left engine i s only around high 80s. > > Right engine oil press comes down as expected after the engine warms. > > We take off and in cruise, both pressures are matched +/- 1 PSI. > > After landing, the right engine oil pressure is very low, below bottom red line. > > If I were to do a feather check at this point, the prop recovery time is v ery long confirming low oil pressure. > > My mechanic replaced the ball and spring for the "oil pressure maintaining valve", if that term is correct, and honed out a fresh seat for the ball. > > No change to the oil pressure behavior I listed above, > > > Any ideas? > > Regards, > > Derek Groves > Midas Air Corp > Groves Aviation Inc. > Dgroves484@gmail.com > (954) 240-1383 > > Derek Groves > Midas Air Corp > Groves Aviation Inc. > N202JH@gmail.com > (954) 240-1383 > > Derek Groves > Midas Air Corp > Groves Aviation Inc. > N202JH@gmail.com > (954) 240-1383 > > Sent from my iPad > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= >




    Other Matronics Email List Services

  • Post A New Message
  •   commander-list@matronics.com
  • UN/SUBSCRIBE
  •   http://www.matronics.com/subscription
  • List FAQ
  •   http://www.matronics.com/FAQ/Commander-List.htm
  • Web Forum Interface To Lists
  •   http://forums.matronics.com
  • Matronics List Wiki
  •   http://wiki.matronics.com
  • 7-Day List Browse
  •   http://www.matronics.com/browse/commander-list
  • Browse Commander-List Digests
  •   http://www.matronics.com/digest/commander-list
  • Browse Other Lists
  •   http://www.matronics.com/browse
  • Live Online Chat!
  •   http://www.matronics.com/chat
  • Archive Downloading
  •   http://www.matronics.com/archives
  • Photo Share
  •   http://www.matronics.com/photoshare
  • Other Email Lists
  •   http://www.matronics.com/emaillists
  • Contributions
  •   http://www.matronics.com/contribution

    These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.

    -- Please support this service by making your Contribution today! --