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04-13-2010, 07:48 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Engine mount cotter pins
Is it me or is the cotter pin callout for the cotter pins on the engine mount to firewall bolts (RV-7A) too small?
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04-13-2010, 08:41 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Could be, Bob...
...so it's a good idea and standard practise for a lot of A@P's to use the largest size that will fit the hole. Same deal with safety wire.
Best,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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04-13-2010, 09:27 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,647
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Diameter too small or length too short? For the latter, you will find that longer pins are extremely difficult to work with. As it is, I've found you have to insert the pin until it hits the recess the nut is in, then turn the bolt until you can continue pushing the pin home. At least one bolt on my engine is awkwardly placed so that I can't align it so that a pin will have no interference on both sides, so the called-for pins are the best I can do. It can also be a real pain to turn the pin ends over in some of the hard-to reach spots.
__________________
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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04-13-2010, 10:47 AM
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Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
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Van issued a Revision to DWG 46A...
...dated 12/05/08/.
The old call out was for MS24665-208, and the new call out is to replace with MS24665-283. This increases the diameter of the cotter pin by 1/64.
I believe the pdf for this change is on Van's web site, either in the SB section or the Service Letter section.
Last edited by noelf : 04-13-2010 at 02:43 PM.
Reason: I posted some wrong data
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04-13-2010, 11:02 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Ah, thanks. The perils of having an old (unfinished) plane and plans.
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04-13-2010, 02:45 PM
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Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
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Dang...
...thanks SPARKY for catching my dyslexia post. I edited my original, and put in the correct MS24665-283 number.
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04-13-2010, 06:21 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Or you could...
Quote:
Originally Posted by Bob Collins
Is it me or is the cotter pin callout for the cotter pins on the engine mount to firewall bolts (RV-7A) too small?
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...just replace the nut with all-metal lock nuts like some certified planes use.
http://www.vansairforce.com/communit...ad.php?t=51522
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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04-13-2010, 07:33 PM
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Join Date: Jan 2005
Location: Cincinnati, Ohio
Posts: 1,060
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Quote:
Originally Posted by az_gila
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Thats what I do now.
__________________
Jon Thocker
Habitual Offender
RV4, RV4, RV6A, RV8, RV8, RV8,RV8, RV8, RV8, RV12
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