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10-12-2009, 03:42 AM
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Join Date: Sep 2008
Location: Tasmania Australia
Posts: 77
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Nose gear taper pin
Hi all
Today i was installing the taper pin in my nose gear were the bolt normally goes. To start with i couldnt get the taper reamer to cut and when i did i some how stupidy let the reamer cut to deep  so now the head of the taper pin actually goes below the surface of the mount when tightend. Does any one have ay ideas how to fix this or can i get an oversize taper pin or did i just stuff my engine frame and nose gear   
__________________
Paul Austin
Tasmania Australia
RV7A
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10-12-2009, 04:46 AM
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Join Date: Jan 2006
Location: Belgium
Posts: 645
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Have one made!
Paul, I don't know about an oversize taper pin, but if all else fails you could have a slightly larger one made by a machine shop. It will not be cheap, but sure cheaper than a new engine mount and gear leg (especially because it needs to be shipped down under).
Regards, Tonny.
__________________
"Pilottonny"
Tonny Tromp
Lanaken, Belgium (EU)
RV9A, Registration: PH-VAN
ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
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10-12-2009, 07:22 AM
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Join Date: Jul 2006
Location: Flower Mound, Texas
Posts: 122
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Taper Pins
Hi Paul,
Taper pins come in various grip lengths just like bolts. The answer to your problem may be as simple as purchasing a longer taper pin. Here is a specification for AN386 Pins (Thanks to Aircraft Spruce). You can always purchase a pin with a grip length longer than you need and shorten it by cutting off the excess large end of the taper.
If the shoulder on the small threaded end of the taper pin extends more than 1/16 inch beyond the tubing you may need to go to the next larger pin size (AN386-5).
Hope this helps.
__________________
Jim Ellis
RV-7A, N23VC, Slider, Garmin G3X Touch Panel,
Barrett Precision Engines Superior XPIO-360,
Dual P-Mags, Airflow Performance FM200A,
Classic Aero Designs Interior,
GLO Custom Aircraft Paint,
Flying
RV-9A N155T, Sold
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10-12-2009, 08:38 AM
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Join Date: Aug 2007
Location: Shallotte NC
Posts: 594
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taper pin??
Hmmmmmm...taper pin. I seem to remember an AN bolt in my 9A nosegear leg.
Is this a design change??
Thanks,
Chris
__________________
Chris Schmitt
Shallotte, NC
RV9A 90970 N614RV
Sold to nice folks in Texas and badly missed.
RV9 in progress
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10-12-2009, 08:48 AM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Hi Chris,
No... not a design change, just a fix for loose bolt fit.
Quote:
Originally Posted by carguy614
Hmmmmmm...taper pin. I seem to remember an AN bolt in my 9A nosegear leg.
Is this a design change??
Thanks,
Chris
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__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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10-12-2009, 09:46 AM
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Join Date: Jul 2006
Location: Flower Mound, Texas
Posts: 122
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Nose Gear Taper Pin Mod
Hi Chris,
Several years ago I wrote a brief article on replacing the nose gear bolt with a taper pin. You can find the article on the Matronics Wiki here.
A number of people that have tried this have had great difficulty reaming the tapered hole. The strut is very hard metal and does not ream easily. Unless you are really motivated I think you might be better off to use a close tolerance bolt rather than a taper pin. Do a search for nose gear bolts on this Forum and you will find sizes and sources for the bolt you need.
__________________
Jim Ellis
RV-7A, N23VC, Slider, Garmin G3X Touch Panel,
Barrett Precision Engines Superior XPIO-360,
Dual P-Mags, Airflow Performance FM200A,
Classic Aero Designs Interior,
GLO Custom Aircraft Paint,
Flying
RV-9A N155T, Sold
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10-12-2009, 10:57 AM
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Join Date: Jan 2007
Location: NC
Posts: 664
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Quote:
Originally Posted by Jim Ellis
Hi Chris,
Several years ago I wrote a brief article on replacing the nose gear bolt with a taper pin. You can find the article on the Matronics Wiki here.
A number of people that have tried this have had great difficulty reaming the tapered hole. The strut is very hard metal and does not ream easily. Unless you are really motivated I think you might be better off to use a close tolerance bolt rather than a taper pin. Do a search for nose gear bolts on this Forum and you will find sizes and sources for the bolt you need.
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Is the nosegear material different from the 6150 steel used for RV-3/4/6/7 gear legs? I used a taper pin on my RV-3 gear legs and drilling the hole took a lot more effort than reaming the taper. With a new reamer and adequate pressure, it cuts very easily and quickly. You would need a larger diameter pin, since a longer one would still fall through the hole. Sounds like a taper pin is a deviation from the plans, so in theory you could use whatever size pin you'd like...it's experimental  I've heard of RV-4 drivers having to enlarge the gear retainer bolt to 3/8" because the original wallowed out after several hundred hrs. The only negative to the Wittman gear, it seems to me.
Last edited by sandifer : 10-13-2009 at 09:51 AM.
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10-12-2009, 12:09 PM
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Join Date: Aug 2007
Location: Shallotte NC
Posts: 594
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Thanks guys...
Informative. I knew nothing about that modification.
Regards,
Chris
__________________
Chris Schmitt
Shallotte, NC
RV9A 90970 N614RV
Sold to nice folks in Texas and badly missed.
RV9 in progress
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10-13-2009, 12:16 AM
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Join Date: Feb 2006
Location: Hong Kong/Tasmania
Posts: 30
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Shipment from Vans
Hi Paul
We are having a shipment of FWF and Finish Kit from Vans to Hobart sometime early next month for a 9A. You are welcome to piggy-back anything you need to ship from Vans.. It may help if you wish..
Thanks
-Neil
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10-13-2009, 09:36 AM
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Join Date: Oct 2006
Location: Brooksville, FL
Posts: 356
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Nose Gear Bolt hole wear issue
Hi All,
I've seen this issue with a lot of Van's nose gear planes. The motor mount front gear bolt hole wears oblong when the bolt loosens. Taper pins and larger bolts are only a short term solution to a re-occuring problem. Once a taper pin hole or larger bolt hole wears again, fixing the problem will require a new mount and new gear leg.
What I have found is that by using permanent lock tight on the upper gear leg fitting eliminates the re-occuring problem.
Quote:
Originally Posted by sandifer
Is the nosegear material different from the 6150 steel used for RV-3/4/6/7 gear legs? I used a taper pin on my RV-3 gear legs and drilling the hole took a lot more effort than reaming the taper. With a new reamer and adequate pressure, it cuts very easily and quickly. You would need a larger diameter pin, since a longer one would still fall through the hole. Sounds like a taper pin is a deviation from the plans, so in theory you could use whatever size pin you'd like...it's experimental  I've heard of RV-4 drivers having to enlarge the gear retainer bolt to 3/8" because the original wallowed out after several hundered hrs. The only negative to the Wittman gear, it seems to me.
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__________________
Fred Stucklen
wstucklen1@cox.net
RV-7A N924RV Flying (1825 Hrs & counting)
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
Last edited by Fred.Stucklen : 10-13-2009 at 09:48 AM.
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