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Old 08-20-2017, 03:58 AM   #1
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Default lycoming engine bolts

so we mounted the engine today. the starter was not attached and the hardware for it was not in the crate. if I go to ACS (or elsewhere), there is some awful looking price tags for Lycoming hardware, even something as simple as a nut. the worst offense is this bolt:

http://www.skygeek.com/textron-lycom...22-2-bolt.html, 3,400 bucks (which obviously I don't need but...).

do I really have to suffer thru these prices or is it ok just to buy some grade 8 cad plated nuts and bolts?


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Last edited by garyg; 08-20-2017 at 04:20 AM.
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Old 08-20-2017, 04:20 AM   #2
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That is actually a tool and there are cheaper ways to do it. If you were splitting cases every day, its probably a bargain. Their plate to go with it is $11,000. The Rolls Royce 250 fuel injector tool is $2,000; I bought the generic for $150.


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Old 08-20-2017, 04:26 AM   #3
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Quote:
Originally Posted by TFF1 View Post
That is actually a tool and there are cheaper ways to do it. If you were splitting cases every day, its probably a bargain. Their plate to go with it is $11,000. The Rolls Royce 250 fuel injector tool is $2,000; I bought the generic for $150.
dont look like much of a tool for 3k. I use to work on VW, Audis and Porshes and even an occasional Rolls Royce....

even still this bolt:
LW-31-0.88 LYCOMING BOLT-.3125-18 X .88 LONG HEX

is a whopping 72 bucks.

a simple 0.3125-18 nut is 2-3 bucks.
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Old 08-20-2017, 01:14 PM   #4
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Here's a good resource for the hardware sizes http://eci.aero/pdf/hardwaremanualM300.pdf

All the coarse thread bolts Ive seen on Lycomings are grade 5.
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Old 08-20-2017, 01:44 PM   #5
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Default Bolts

Grade 5 except that the Lycoming bolts are cad plated and the ones you buy at the hardware store may be zinc plated. I think Lyc strips and replates the grade 5 bolts.
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Old 08-20-2017, 02:00 PM   #6
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Thanks!

ok for the missing starter bolt it says:
AE8001-5-1.16 1 Bolt, Hex, 5/16-18 UNC-3 x 1-5/32 Long, for which the price i listed as a whopping 12.74.

the nuts are a mere 1.24...

why would anyone pay 12.74 bucks for one fairly non-descript bolt?
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Old 08-20-2017, 02:05 PM   #7
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grade 5 cad plated (1 1/2 inch) at mcmasters is 1.12 a piece, so it must be the oddball length driving the price?
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Old 08-20-2017, 04:30 PM   #8
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I think that's at least part of it. Lycoming uses a lot of odd length bolts. I've never understood why.
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Old 08-20-2017, 08:56 PM   #9
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check the aircraft spruce catalog or web site.... coarse MS bolts are listed as are Lycoming coarse standard bolts that are not overly expensive
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Old 08-20-2017, 11:00 PM   #10
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check the aircraft spruce catalog or web site.... coarse MS bolts are listed as are Lycoming coarse standard bolts that are not overly expensive
12.75 at ACS. I can only find the OEM part art ACS, no "generic"
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Old 08-21-2017, 06:39 PM   #11
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Lots of engines held together with AN hardware...Ranger had Part numbers for all there hardware and either made it in house or had it made. My guess is because 1) they wanted you to buy it from them only and 2) the designs of that engine predate AN hardware (the origins...they updated the manual several times and some, not all even have a AN sub called out)

One of one for Ranger is the cylinder base nuts. The are just basically a Jap nut..with a bit more meat on the base. (MS21042-"x")

Some guys will freak out over things like this and others will use what is currently a suitable sub. No sense in remaking hardware that would cost $$$$$$ when there is commercially available subs that are as good or better.

Another one on Ranger is the bolts that hold the flyweights on the counter balance plate and the bolts that hold the plate to the crank. They are not torqued but stretch a certain amount to be tight then they are drilling and a thin nut (also of some special part number) is drilled and a tapered pin inserted. The tapered pin is a AN Part but I don't think they make those either! Anyway, at some point we will have to research and make these bolts as all the NOS stuff will be gone. Same for the lead shim between the crank and counter balance.

In this case I've requested the drawings from the FAA to see what material, measurements etc etc is used. (I've requested alllll the engineering drawings on the Ranger....they are suppose to have them when they issued a type certificate and now that no one own it, or it's unclear who does...and they don't have the drawings I'm sure anyway...it's up to the FAA to hopefully have the drawings so new hardware can be made using the factory drawings or at least subs used based on the engineering drawings.


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