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Fuel injection servo attachment - concerned ?

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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Wed Mar 04, 2009 2:33 pm Post subject: Fuel injection servo attachment - concerned ?

Trying to get my Precision Airmotive silver hawk EX F/I servo attached permanently to the Mattituck engine and Filtered Air Box.



I called Mahlon at Mattituck who told me that the servo is bolted on to the engine with the already attached studs. He said to use a std washer and then a star washer over that before you bolt it on to 204 in/lbs. I assume that it will not vibrate out - does anyone use locktite????



Next is the attachment to the FAB box which is accomplished with the supplied "non-standard"  1/4 x 20 bolts that are 1/2 inch long. Instead of the standard #AN4 bolts that can be safety wired. These to be secured with 96 in/lbs into the aluminum. Ingetion of these bolts into the maifold could be catastrophic.



Question: Does anyone know a source for  1/4 x 20 x 3/4" long (the 1/2" are too short) bolts that are drilled with a hole for safety wires????

_________________
See you OSH '18
Q/B - sold.

egohr1

Joined: 17 Jan 2006
Posts: 38
Location: Oklahoma City

Posted: Wed Mar 04, 2009 4:33 pm Post subject: Re: Fuel injection servo attachment - concerned ?

Check with Vans.  My FAB came with drilled bolts straight from Vans.  The bolts are specifically noted as needing to be safety wired.

_________________
eric gohr
EGOHR86@alumni.carnegiemellon.edu

jesse(at)saintaviation.co
Guest

Posted: Wed Mar 04, 2009 6:21 pm Post subject: Fuel injection servo attachment - concerned ?

Those should definitely have come with the FWF kit if I remember  

correctly.  Either that or it should come with the engine, but I think  

in one of the hardware bags in the FWF kit.  Check those out.



do not archive



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694



On Mar 4, 2009, at 5:33 PM, AirMike wrote:



 	  Quote: 	
		   



 Trying to get my Precision Airmotive silver hawk EX F/I servo  

 attached permanently to the Mattituck engine and Filtered Air Box.



 I called Mahlon at Mattituck who told me that the servo is bolted on  

 to the engine with the already attached studs. He said to use a std  

 washer and then a star washer over that before you bolt it on to 204  

 in/lbs. I assume that it will not vibrate out - does anyone use  

 locktite????



 Next is the attachment to the FAB box which is accomplished with the  

 supplied "non-standard"  1/4 x 20 bolts that are 1/2 inch long.  

 Instead of the standard #AN4 bolts that can be safety wired. These  

 to be secured with 96 in/lbs into the aluminum. Ingetion of these  

 bolts into the maifold could be catastrophic.



 Question: Does anyone know a source for  1/4 x 20 x 3/4" long (the  

 1/2" are too short) bolts that are drilled with a hole for safety  

 wires????



 --------

 OSH '08 or Bust (busted) be there in &quot;09

 Q/B Kit - wiring and FWF





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 33228#233228

AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Wed Mar 04, 2009 10:26 pm Post subject: safety wired bolts

My FWF kit that I picked up approx   August '07 has these plain 1/2" long 1/4x20 bolts. They use this "tab/washer arrangement" to secure the bolts in place. I consider this a poor solution and potentially dangerous giving you four more pieces of steel in the FAB. 



I may have located the drilled 1/4 x 20 bolts at Spencer Aircraft in Washington State.

_________________
See you OSH '18
Q/B - sold.

bkbrown(at)minetfiber.com
Guest

Posted: Thu Mar 05, 2009 6:34 am Post subject: Fuel injection servo attachment - concerned ?

Remember that it's really not a big deal to drill a bolt, either the head or

the threaded end.  There are jigs out there to help you do it (Avery or

Cleveland), or if you're a welder, you can make a jig.  I have purchased

many bolts for things like FAB's from a nearby farm supply store, some of

them maintain excellent selections (lengths and diameters) of grade 5 and

grade 8 bolts and various lock washers.  All the attachments to my FAB on my

plane are safetied...although there are also some shop side rivet heads that

could conceivable break off and get sucked in.  The reality though is, that

isn't the cause of very many accidents that I'm aware of.  Good luck in your

search.  BTW, I hate tab washers...and have broken many tabs at installation

over the years...which doesn't inspire much confidence in them for me.



--

Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Thu Mar 05, 2009 8:20 am Post subject: Re: Fuel injection servo attachment - concerned ?

Interesting explanations on locking methods:



http://www.roymech.co.uk/Useful_Tables/Screws/Locking.html



Michael

_________________
RV-10 builder (flying)
#511

partner14

Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas

Posted: Thu Mar 05, 2009 8:34 am Post subject: Fuel injection servo attachment - concerned ?

Without the cost of a special jig, just purchase several center drills.  Used in the machinists arean a lot.  They come in several sizes.  I use them for starting lot's of holes because they don't wander.... and I just finished drilling a bolt that I needed that was just a little longer than the pre-drilled bolt I had... no problem.

 Don McDonald



--- On Thu, 3/5/09, Bob and Karen Brown <bkbrown(at)minetfiber.com> wrote:



 [quote]

From: Bob and Karen Brown <bkbrown(at)minetfiber.com>

Subject: RE: Re: Fuel injection servo attachment - concerned ?

To: rv10-list(at)matronics.com

Date: Thursday, March 5, 2009, 6:32 AM



 --> RV10-List message posted by: "Bob and Karen Brown" <bkbrown(at)minetfiber.com (bkbrown(at)minetfiber.com)>



Remember that it's really not a big deal to drill a bolt, either the head or

the threaded end.  There are jigs out there to help you do it (Avery or

Cleveland), or if you're a welder, you can make a jig.  I have purchased

many bolts for things like FAB's from a nearby farm supply store, some of

them maintain excellent selections (lengths and diameters) of grade 5 and

grade 8 bolts and various lock washers.  All the attachments to my FAB on my

plane are safetied...although there are also some shop side rivet heads that

could conceivable break off and get sucked in.  The reality though is, that

isn't the cause of very many accidents that I'm aware of.  Good luck in  your

search.  BTW, I hate tab washers...and have broken many tabs at installation

over the years...which doesn't inspire much confidence in them for me.



--

_________________
Don A. McDonald
40636

AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Thu Mar 05, 2009 9:32 am Post subject: Fuel injection servo attachment - final word

I spoke to Vans this morning.



Apparently I had the FAB installation kit with bag 939-1. This kit was delivered in August of 2007. 



Bag 939-1 has been superseded by bag 939-2 with 1/4x20 bolts that are DRILLED.



Vans does not show this item in their on-line catalog and I was unable to find these drilled bolts anywhere else. I would urge anyone using the tabs to replace them with the drilled and safety wired bolts. The tabs are only supposed to be used once and could work harden and break off if used twice

_________________
See you OSH '18
Q/B - sold.

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Thu Mar 05, 2009 3:19 pm Post subject: Fuel injection servo attachment - concerned ?

An exceptional reference with one small footnote.  Nylocs have a max

temperature range and should be used judiciously around the FWF

application or near brake cylinders and M5606.  Heat will cause a loss

of locking capability at your worst time.  Other nuts meet that higher

temperature requirement.



To that I add, every builder is the manufacturer, they set their

standard on their experiment and they know best!



John



--

jcumins(at)jcis.net
Guest

Posted: Fri Mar 06, 2009 12:11 pm Post subject: Fuel injection servo attachment - concerned ?

If any one needs good aircraft hardware go to JCAero.com.  He has anything

and everything you need if it is not on his web site give him a call and we

will have it or he can order it.  I get all my hardware from him and he is

way cheaper then the other places.



But I can drive right up to his shop and get anything I need on a moments

notice.



John G. Cumins

President

 

JC'S Interactive Systems

2499 B1 Martin Rd

Fairfield Ca 94533

707-425-7100

707-425-7576 Fax

 

Your Total Technology Solution Provider

--

nukeflyboy

Joined: 05 Jan 2008
Posts: 162
Location: Granbury, TX

Posted: Sat Mar 07, 2009 3:47 am Post subject: Re: Fuel injection servo attachment - concerned ?

AirMike,



There are many ways to lock a bolt in place and there is nothing wrong with the tabs that were sent with the kit.  They work fine and are a recognized way of safetying a bolt to prevent backing out.  So is staking but bent tabs are much easier for homebuilders.  Often times it is not practical to safety wire and this is a good substitute.   Of course you can only use it once.



You can replace it with a drilled head/safety wire combo if you like, but it is not correct to say it is "dangerous".

_________________
Dave Moore
RV-6 built and sold
RV-10 built and flying

Gordon Anderson

Joined: 16 Apr 2012
Posts: 41
Location: Switzerland

Posted: Sun May 17, 2015 1:12 am Post subject: Re: Fuel injection servo attachment - concerned ?

I have the Van's Lycoming IO-540 and am ready to attach the fuel servo to the engine, but cannot find any instructions or hardware.  Only the nuts and plain washers holding the plastic "preservation" cover plate on the sump together with a blind gasket were supplied with the engine & servo. 



Lycoming Service Instruction 1484C gives the torques but states to "refer to the Parts Catalogue for the correct washers, lock washers, nuts, gaskets and spacers" 



Can anyone provide a copy of the relevant page in the Lycoming parts catalogue?



Assuming a gasket is required, is it normal to use one both above and below the control cable bracket?



Gordon Anderson

Switzerland

jesse(at)saintaviation.co
Guest

Posted: Sun May 17, 2015 5:54 am Post subject: Fuel injection servo attachment - concerned ?

You want a gasket on both sides of the bracket and you want lock washers under the nuts holding the servo on. The hardware, IIRC, should have been included with the FWF kit. 



Jesse Saint

Saint Aviation, Inc.

352-427-0285

jesse(at)saintaviation.com



Sent from my iPad



 	  Quote: 	
		   On May 17, 2015, at 5:12 AM, Gordon Anderson <mregoan(at)hispeed.ch> wrote:

 

 

 

 I have the Van's Lycoming IO-540 and am ready to attach the fuel servo to the engine, but cannot find any instructions or hardware.  Only the nuts and plain washers holding the plastic "preservation" cover plate on the sump together with a blind gasket were supplied with the engine & servo. 

 

 Lycoming Service Instruction 1484C gives the torques to "refer to the Parts Catalogue for the correct washers, lock washers, nuts, gaskets and spacers" 

 

 Can anyone provide a copy of the relevant page in the Lycoming parts catalogue?

 

 Assuming a gasket is required, is it normal to use one both above and below the control cable bracket?

 

 Gordon Anderson

 Switzerland

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=442185#442185

carl.froehlich(at)verizon
Guest

Posted: Sun May 17, 2015 6:13 am Post subject: Fuel injection servo attachment - concerned ?

You might want to look again.  Hardware and gaskets should be in a bag that

came with the engine.  If it is not there give Van's a call.



Yes - a gasket goes on each side of the control cable bracket.  If memory

serves, the bracket came with a gasket.



Carl



--

Gordon Anderson

Joined: 16 Apr 2012
Posts: 41
Location: Switzerland

Posted: Sun May 17, 2015 11:52 am Post subject: Re: Fuel injection servo attachment - concerned ?

Carl, Jesse, thanks a lot for challenging me to go look again.  Now I managed to find the hardware and gasket. Definitely time for some 5S in the workshopâ€¦.



Cheers, 



Gordon



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