Proper Landing gear axle attachment bolts
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Proper Landing gear axle attachment bolts
At annual I removed wheel fairings and back plates to install some 8.00 x 6 tires. Still to be determined brand of tire im going to as most of my flying is from asphalt with some grass strips included. But the thing I noticed most was the 5 washers on the back side of the lady legs (1953 B Model) attacthing the solid aluminum axles. Can't be right? Can anybody stear me the way of the proper bolt and nut An numbers. Top two bolts are of smaller diameter. Also whats the most popular brand of 8.00 X 6 or 8.5 x 6 tires.
Brent yocum with new to me 170B
Brent yocum with new to me 170B
Re: Proper Landing gear axle attachment bolts
The top bolts are AN5-23A or NAS145-41 and the bottoms are AN6-24A or NAS146-42. The NAS bolts are recommended for ski installations and require a special washer as well.
As a new owner you may want to download the C170B parts manual https://support.cessna.com/custsupt/dyn ... dynVal=477
Its FREE!
As a new owner you may want to download the C170B parts manual https://support.cessna.com/custsupt/dyn ... dynVal=477
Its FREE!
Karl
'53 170B N3158B SN:25400
ASW-20BL
'53 170B N3158B SN:25400
ASW-20BL
- ghostflyer
- Posts: 1395
- Joined: Mon Apr 21, 2008 3:06 am
Re: Proper Landing gear axle attachment bolts
I use Michelin tyres and tubes . I replace the tube each time I replace the tyre because tubes wear also. We have many brands of tyres on aircraft that come through the shop and have found Michelin’s are the slowest to loose pressure over time and have the best wear characteristics. Those Tundra tires from Alaska look and work great but wear so quickly on hard surfaces and cost a arm and a leg. My axle attach bolts are all the same size and are all MS bolts . Those axle attach bolts will be all different lengths because of the different thicknesses of the shims for alignment.
Re: Proper Landing gear axle attachment bolts
Thx for the info! My plane has the lady legs and no shims on either side.
- Bruce Fenstermacher
- Posts: 10321
- Joined: Tue Apr 23, 2002 11:24 am
Re: Proper Landing gear axle attachment bolts
Really, no shims. Is that even possible? I'd be looking into that.
BTW 8.50x6 are not on the TCDS so if you care, your looking at fishing around for paperwork to make them legal. 8:00x6 are on the TCDS.
BTW 8.50x6 are not on the TCDS so if you care, your looking at fishing around for paperwork to make them legal. 8:00x6 are on the TCDS.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Re: Proper Landing gear axle attachment bolts
I installed Air Trac 8.00x6 4-ply tires in June 2015 and have been extremely satisfied. They're much softer than the Michelin 7.00x6-6s they replaced, so they make landings a bit bouncier, but the softness is good on dirt and grass. I run 20-22psi operating mostly from concrete, and the tires have been wearing very well. I could run lower pressure, but I haven't experimented with it.
Re: Proper Landing gear axle attachment bolts
Really no shims. Seems to track straight. But again it’s new to me. I only have about 3 hrs in the 170.
What kind of toe in is desired?
What kind of toe in is desired?
Re: Proper Landing gear axle attachment bolts
Well , I don’t have any shims either and mine is ok on the ground as well (or so I think so). I’ve checked the alignment a few times didn’t need to re-adjust. I do have some of the outside wear pattern but it’s surviveable.
Jim McIntosh..
1953 C170B S/N 25656
02 K1200RS
1953 C170B S/N 25656
02 K1200RS
Re: Proper Landing gear axle attachment bolts
Zero Toe-in at 2,000 lbs is recommended by Cessna.Byocum wrote:Really no shims. Seems to track straight. But again it’s new to me. I only have about 3 hrs in the 170.
What kind of toe in is desired?
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
-
- Posts: 3481
- Joined: Sat May 06, 2006 6:05 pm
Re: Proper Landing gear axle attachment bolts
No shims with proper alignment would indicate a nice straight fuselage and straight gear, either from the factory or with proper rebuilds along the way.
No shims on my C180 either and it was wadded up into a ball by a tornado before I got it.
No shims on my C180 either and it was wadded up into a ball by a tornado before I got it.
Richard Pulley
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
-
- Posts: 121
- Joined: Sun Dec 03, 2006 3:44 am
Re: Proper Landing gear axle attachment bolts
Karl,lowNslow wrote:The top bolts are AN5-23A or NAS145-41 and the bottoms are AN6-24A or NAS146-42. The NAS bolts are recommended for ski installations and require a special washer as well.
As a new owner you may want to download the C170B parts manual https://support.cessna.com/custsupt/dyn ... dynVal=477
Its FREE!
What special washers? Looked everywhere, but couldn't find anything about a special washer.
- sfarringer
- Posts: 309
- Joined: Wed Jan 12, 2005 10:49 pm
Re: Proper Landing gear axle attachment bolts
These NAS bolts are a high strength bolt, and have a radius between the underside of the head and the bolt shank.
A special washer with a countersink that provides relief for the radius is required. Without the special washer, the regular washer can dig into the radius which creates a stress riser and compromises the bolt.
The 5/16 countersunk washer is NAS143-5C, which has been superceded by MS20002C5.
The 3/8 countersunk washer is NAS143-6C, which has been superceded by MS20002C6.
A special washer with a countersink that provides relief for the radius is required. Without the special washer, the regular washer can dig into the radius which creates a stress riser and compromises the bolt.
The 5/16 countersunk washer is NAS143-5C, which has been superceded by MS20002C5.
The 3/8 countersunk washer is NAS143-6C, which has been superceded by MS20002C6.
Ragwing S/N 18073
- Kevin Pearce
- Posts: 49
- Joined: Mon Feb 26, 2018 8:03 am
Re: Proper Landing gear axle attachment bolts
Karl
Thank you for posting the C170B parts manual link, very helpful.
Kevin
Thank you for posting the C170B parts manual link, very helpful.
Kevin
-
- Posts: 121
- Joined: Sun Dec 03, 2006 3:44 am
Re: Proper Landing gear axle attachment bolts
Thank you for the information.sfarringer wrote:These NAS bolts are a high strength bolt, and have a radius between the underside of the head and the bolt shank.
A special washer with a countersink that provides relief for the radius is required. Without the special washer, the regular washer can dig into the radius which creates a stress riser and compromises the bolt.
The 5/16 countersunk washer is NAS143-5C, which has been superceded by MS20002C5.
The 3/8 countersunk washer is NAS143-6C, which has been superceded by MS20002C6.
Looks like your plane is a little older than ours, which has a serial # of 18118.