VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 12-23-2017, 06:26 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 1,506
Default oil leak on top of engine?

I don't understand this one. It's not the fwd crank seal. Has anyone had anything similar? thx, Steve



fwd crank seal area is clean


splatter on the cowl
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.

see Amanda Melton for www.rvplasticparts.com
Reply With Quote
  #2  
Old 12-23-2017, 06:39 PM
Craig23's Avatar
Craig23 Craig23 is offline
 
Join Date: Jan 2005
Location: Santa Rosa, CA
Posts: 215
Default Yep.

I have had a similar leak. I was getting some leakage from one of the safety-wired bolts in the photo, then later I had a leak from the bolt hole at the top of the case where the engine hoist bracket is installed. To fix that one my A&P friend, Mike Cingari, recommended removing the bolt, cleaning the hole out and using green (wicking) loctite to seal whatever gap there was between the two halves of the engine case. I redneck pressurized the loctite into the hole, let it set for a little while, put some gasket making material on the bolt shaft and reinstalled it. It's been dry ever since.

The bolts over the lifters were more of a problem, but only because I used too much force putting them back in and stripped the threads on the aluminum engine case.
__________________
Craig Schwartz
RV-8 (Flying!), IO-360B1PC2 (180 hp, 1 P-Mag, 1 Slick Mag), Whirlwind 200RV, AF-3500, G496, Digiflight II, Classic Aero Sportsman Ultraleather Seats
N868RV
Santa Rosa, CA
Reply With Quote
  #3  
Old 12-23-2017, 09:45 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 1,506
Default

thanks for the info. I'll take a look at those bolts after clean up and a flight with some oil trace powder. I'm amazed that the oil splatters to the underside of the upper cowl.
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.

see Amanda Melton for www.rvplasticparts.com
Reply With Quote
  #4  
Old 12-23-2017, 10:30 PM
Lars Lars is offline
 
Join Date: Nov 2005
Location: Davis, CA
Posts: 983
Default

The center cam journal is below the case bolt with the hoist ring on it. Loosen that bolt and tighten it again, you might get a leak (I did) because of pressurized oil trying to make its way out. It spread all over the top of the case, just as in your photo. I did the same thing as Craig. Removed bolt, squirted in some wicking loctite, torqued to spec. Leak-be-gone.

I haven't had a leak from a lifter anti-rotation pin (the black safety-wired bolts) but I suppose that could happen too. Just be careful with loctite there, don't want it getting into the lifter bore.
__________________
Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
600 hours as of April 9, 2018
Reply With Quote
  #5  
Old 12-24-2017, 06:25 AM
snopercod's Avatar
snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 1,000
Default Fluorescent Leak Detection Dye

When I had an oil leak that I couldn't find, in desperation I added Fluorescent Leak Detection Dye to the oil and searched for the leak with a UV flashlight in a darkened hangar. I eventually found a leaking valve cover gasket, but it took a while because the oil from a leak blows all over the engine. I changed out the oil with the dye as soon as I found the leak.
__________________
(2018 dues paid)
Reply With Quote
  #6  
Old 12-24-2017, 07:10 AM
Robert Anglin Robert Anglin is offline
 
Join Date: Mar 2008
Location: houston, texas
Posts: 766
Default Tip.

Down though the years we have found that these small leaks can be hard to spot at first. But once you find that you have one we just clean the area with some brake clean from your local aircraft car supply, then run it for a few minutes to see where the leak is coming from. The trick is to clean very good then run just long enough to start the leak to show it's self. The die trick work well too, but takes a little longer to let it get in the system and start showing it's seeping point. Hope this helps, Yours, R.E.A. III # 80888
Reply With Quote
  #7  
Old 12-24-2017, 12:17 PM
andyrv andyrv is offline
 
Join Date: Feb 2005
Location: Leawood, KS
Posts: 237
Default Locktite here too.

Had a similar leak but either not as bad or got lucky and caught it sooner. Used the vacuum and wicking locktite. No more leaks in last 500 hours.

Mine was only the bolt at the lifting ring. I also sealed the bolt, washers and the hole with Dow 737 after the vacuum/locktite but probably not needed.

Andy
Superior IO-360 Roller - 1350 hours
__________________
Andy Cobb
RV-7A
Reply With Quote
  #8  
Old 12-24-2017, 03:54 PM
Dorfie Dorfie is offline
 
Join Date: Aug 2009
Location: Lexington, KY
Posts: 430
Default

I had similar issue. Cleaned the oil leaks well with mineral spirits and let dry. Sprayed on athletes foot spray on suspected areas. It comes out white. Ground run engine till leak shows up. Worked very well to identify the leak source. The white wipes off easily.
Johan
__________________
Dorfie
RV10 Flying, N245JM
2018 dues paid with a smile
Reply With Quote
  #9  
Old 12-24-2017, 04:48 PM
snopercod's Avatar
snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 1,000
Default

Quote:
Originally Posted by Dorfie View Post
Sprayed on athletes foot spray on suspected areas.
Now that's a great idea!
__________________
(2018 dues paid)
Reply With Quote
  #10  
Old 12-26-2017, 08:20 AM
EXflyer EXflyer is offline
 
Join Date: Jan 2016
Location: Chiloquin OR
Posts: 46
Default

Looking at the oil track would say its from behind the lifting ring. Always hated tracing an oil leak after someone cleaned the engine off. Always likened it to tracking an animal after a rain storm.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 09:36 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.