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oil seep

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dlm34077(at)gmail.com
Guest

Posted: Sun Jun 25, 2023 9:24 am Post subject: oil seep

Recently new oil and filter installed on IO540 D4A5. We added about 9.5 quarts on the stick.During the annual we opened and serviced (SB) the magnetos. We checked the strainer and removed/replaced the quick drain. We opened and closed five items.- These all check negative for seeps. Yet after seven days uncowled in the hangar, oil continues to seep slowly externally down the fuel pump drain line. I have also checked oil return lines. We are beginning to believe we may have overfilled the oil system. Any feedback from others?

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Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Sun Jun 25, 2023 10:04 am Post subject: oil seep

Could be a broken oil diaphragm in the fuel pump.



Check out this pump teardown from Dan's site:

https://www.danhorton.net/VAF/High%20Fuel%20Pressure/Fuel%20Pump%20Dismantled.docx



The oil sump holds 12 qts in the D4A5, per Lycoming specs. The excess oil would just come out the breather.

Lenny

On Sun, Jun 25, 2023 at 1:36 PM dlm <dlm34077(at)gmail.com (dlm34077(at)gmail.com)> wrote:



 	  Quote: 	
		  Recently new oil and filter installed on IO540 D4A5. We added about 9.5 quarts on the stick.During the annual we opened and serviced (SB) the magnetos. We checked the strainer and removed/replaced the quick drain. We opened and closed five items.- These all check negative for seeps. Yet after seven days uncowled in the hangar, oil continues to seep slowly externally down the fuel pump drain line. I have also checked oil return lines. We are beginning to believe we may have overfilled the oil system. Any feedback from others?

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 500 hrs

partner14

Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas

Posted: Sun Jun 25, 2023 10:39 am Post subject: oil seep

In 13 year and 1,300 hours I've never put more than 7 quarts in mine.

Don 

                  

                                                                    On Sunday, June 25, 2023 at 01:17:36 PM CDT, Lenny Iszak <lenard(at)rapiddecision.com> wrote:                 

                 



                 



                 Could be a broken oil diaphragm in the fuel pump.

Check out this pump teardown from Dan's site:

https://www.danhorton.net/VAF/High%20Fuel%20Pressure/Fuel%20Pump%20Dismantled.docx



The oil sump holds 12 qts in the D4A5, per Lycoming specs. The excess oil would just come out the breather.



Lenny



On Sun, Jun 25, 2023 at 1:36 PM dlm <dlm34077(at)gmail.com (dlm34077(at)gmail.com)> wrote:

 	  Quote: 	
		  Recently new oil and filter installed on IO540 D4A5. We added about 9.5 quarts on the stick.During the annual we opened and serviced (SB) the magnetos. We checked the strainer and removed/replaced the quick drain. We opened and closed five items.- These all check negative for seeps. Yet after seven days uncowled in the hangar, oil continues to seep slowly externally down the fuel pump drain line. I have also checked oil return lines. We are beginning to believe we may have overfilled the oil system. Any feedback from others?



Virus-free.www.avast.com[url=#m_1223495995127093501_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV10-List

_________________
Don A. McDonald
40636

dlm34077(at)gmail.com
Guest

Posted: Mon Jun 26, 2023 8:24 am Post subject: oil seep

subsequent to my last post, it now appears to be seeping around the seal between the mechanical fuel pump   and the accessory case.  Plan to reduce the amount of oil in the system by one quart and tighten the attached bolts of the fuel pump to the case. If the seal has to be changed ,I found that the exchange or overhaul LW-15473 price is $295 plus core charge of $100 from Quality Aircraft accessories in Tulsa. Since the part has run 1700 hours it is probably better to change the part when the new seal is installed rather than do the seal only since the remaining useful life of the part is about  300 hours.



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