VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-8/8A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 02-20-2015, 09:32 PM
erich weaver's Avatar
erich weaver erich weaver is offline
 
Join Date: Aug 2006
Location: santa barbara, CA
Posts: 1,376
Default

Checked my NL starter today. LOOSE! Tab washers were in place.

There is a problem here folks. Everyone should check theirs.

Erich
Reply With Quote
  #12  
Old 09-16-2015, 12:37 PM
tim2542 tim2542 is offline
 
Join Date: Aug 2009
Location: Redding,Ca
Posts: 423
Default Failed again

Yeah mine has come loose again after 49 hrs, bolts pulled, lock tabs still in place. I'm not sure whether to send it in for warranty or just install some tine-serts myself, or buy a B&C.
Tim
Reply With Quote
  #13  
Old 09-16-2015, 12:55 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 3,536
Default

Quote:
Originally Posted by tim2542 View Post
Yeah mine has come loose again after 49 hrs, bolts pulled, lock tabs still in place. I'm not sure whether to send it in for warranty or just install some tine-serts myself, or buy a B&C.
Tim
If you don't send it for warranty how are they going to learn? It is not a flight risk. Put inserts in the new one.

Edit: Or . . Work with them to figure it out. Others might benefit too, and you won't have to experiment solo.
__________________
Bill

Last edited by BillL : 09-16-2015 at 01:25 PM.
Reply With Quote
  #14  
Old 09-17-2015, 06:21 AM
WA85 WA85 is offline
 
Join Date: Apr 2010
Location: Madison, AL
Posts: 88
Default

Over the past 25 years of working on Lycoming engines I have seen many of the in line type starters with loose case bolts and weeping a grey "grease like" substance. A theory explained one day was that the starter motor house experiences small amounts of torque during starting and the long through bolts get twisted slightly, which eventually leads to fretting as the housing gets looser and looser. Not sure how true this is, but this is a fairly common issue.
Reply With Quote
  #15  
Old 09-17-2015, 09:33 AM
jjconstant's Avatar
jjconstant jjconstant is offline
 
Join Date: Dec 2006
Location: Oakland CA
Posts: 720
Default

Hmmm...I've absolutely noticed this repeatedly and repeadtedly tightened the bolts. I put torque seal on the heads and noticed it cracks so there definitely is some loosening going on. Mine did not come with any locking mechanism other than star style lock washers. I remove the phillips head bolts/screws, put new star washers under it, tighten and torque seal. At first it seemed like they loosened with fewer hours, as time has gone on it seems I have to do it less, though I don't know if it's associated with the number of start cycles. I haven't been able to fly as much recently

It would be great to have a more reliable solution...
__________________
All Best

Jeremy Constant
RV7A "Stella Luna" ECI IO-360 WW200RV Pmags 360hrs
VAF 2017 paid plus some for those who can't
Reply With Quote
  #16  
Old 10-24-2015, 10:17 AM
g zero g zero is offline
 
Join Date: Jun 2007
Location: palm coast fl.
Posts: 905
Default Starter

Pulled the cowl to change the oil and give everything a good look . The Skytec Starter was making a mess , sent some pics to SkyTec . They want the starter back for warrantee . Guess they know about the issue and want to make it right .
__________________
Rv8 250 hp Ly-Con
N 666 TA / serial #999
Airworthiness Certificate issued 12/15/2014
First Flight 2-3-2015 🚀
2014 donation paid
Reply With Quote
  #17  
Old 10-24-2015, 05:13 PM
scard's Avatar
scard scard is offline
 
Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 2,544
Default

Just back from the hangar, working on a condition inspection. Skytec NL with a few hundred hours on it completely loose between the halves. Full on "jiggle, jiggle 3/32" between the halves with locking tabs still in place. I'll be interested to hear Skytec's comment.
__________________
Scott Card
RV-9A N4822C flying 1700+hrs. / Cedar Park, TX
Track
RV8 Building - fuselage / showplanes canopy (Done!)
Reply With Quote
  #18  
Old 10-24-2015, 06:01 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 3,536
Default

Quote:
Originally Posted by scard View Post
Just back from the hangar, working on a condition inspection. Skytec NL with a few hundred hours on it completely loose between the halves. Full on "jiggle, jiggle 3/32" between the halves with locking tabs still in place. I'll be interested to hear Skytec's comment.
I would not expect full disclosure, just warranty.

Someone should measure the bolt length each time it comes loose. It may be yielding instead of pulling out the threads. That would help those out of warranty narrow the failure mode, and effect a durable repair. These should be pretty high strength bolts, maybe they came from a non-heat treating country.

Edit: I guess this goes on the oil change check list?
__________________
Bill

Last edited by BillL : 10-24-2015 at 06:03 PM.
Reply With Quote
  #19  
Old 10-24-2015, 06:19 PM
1001001's Avatar
1001001 1001001 is offline
 
Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 565
Default

One trick might be to remove the bolts one at a time and reinstall them, preheating them first. Depending on the material of construction of the bolts, the bolt length difference due to thermal expansion can be very precisely calculated. Heat the bolts so they are maybe 0.0005"- 0.001" longer than cold, then install them.

Steam turbines are often assembled this way, to create a sealing pressure between the two halves that varies less when the casings and bolts heat up and expand.
Reply With Quote
  #20  
Old 10-25-2015, 10:53 AM
Lenny Iszak's Avatar
Lenny Iszak Lenny Iszak is offline
 
Join Date: Sep 2008
Location: Palm City, FL
Posts: 186
Default tab washers

Does anyone know what's the part number for those tab washers?

Lenny
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 11:22 PM.


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.