VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > Main > RV Ongoing Maintenance Issues
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 04-28-2019, 10:23 PM
lndwarrior lndwarrior is offline
 
Join Date: Mar 2015
Location: Cloverdale CA
Posts: 304
Default Damaged thread at engine case oil return fitting

Engine is an O-235. I finally traced an oil leak to a damaged thread inside the case at the oil return fitting.

Is the best solution to run a tap down the thread? If so, any tips on doing this? Since it's inside the engine case I'm concerned about screwing this up.

Any suggestions you have would be appreciated.

TIA
Gary
Reply With Quote
  #2  
Old 04-29-2019, 09:42 AM
guccidude1 guccidude1 is offline
 
Join Date: Mar 2008
Location: Reno NV
Posts: 556
Default Damaged thread at engine case oil return fitting

Running a tap to clean the threads is what I would do. Do it slowly and coat the tap with copious amount of grease to catch any metal filings. Go in a couple of turns remove, clean the grease off. recoat, and go in again. Wrap the male threads liberally with teflon tape and tighten. If it will not tighten, the only alternative I know of is helicoil. Get your local mechanic to do the job. Good luck, Dan from Reno
Reply With Quote
  #3  
Old 04-29-2019, 10:38 AM
engineerorange engineerorange is offline
 
Join Date: Apr 2008
Location: Catawba, NC
Posts: 200
Default

Quote:
Originally Posted by BillL View Post
heli-coil for an NPT thread designed to seal?? Maybe this recommendation should be reconsidered.

Minute - - -sorry
My case had one helicoil installed by crankcase services in a boogered oil return hole at overhaul. A little thread sealant and it is fine. NPT threads don?t seal without some sealant.
__________________
mangling aluminum since May 2009
RV7-A, flying
RV8 under construction
Reply With Quote
  #4  
Old 04-29-2019, 10:42 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,322
Default

Quote:
Originally Posted by engineerorange View Post
My case had one helicoil installed by crankcase services in a boogered oil return hole at overhaul. A little thread sealant and it is fine. NPT threads don?t seal without some sealant.
Good to hear. I deleted my post then a little research turned up some claims but "with sealant" was not very definitive. Your first hand knowledge is reassuring.
__________________
Bill

RV-7
Reply With Quote
  #5  
Old 04-29-2019, 10:44 AM
maniago's Avatar
maniago maniago is offline
 
Join Date: Aug 2014
Location: Bowie MD
Posts: 890
Default

Quote:
Originally Posted by guccidude1 View Post
Wrap the male threads liberally with teflon tape and tighten.
Teflon tape? Really? Maybe if you are super super experienced in its application.

Otherwise, Locktite 567 is bullet proof and idiot proof....and personally, I resemble that remark.....
__________________
Mani
Busby MustangII (FoldingWing) Pending DAR.
Don't be a hater; I'm a cousin with thin wings!
N251Y
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 10:59 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.