Stump the Expert

How to keep the Cessna 170 flying and airworthy.

Moderators: GAHorn, Karl Towle, Bruce Fenstermacher

User avatar
n2582d
Posts: 2808
Joined: Mon Apr 29, 2002 4:58 am

Re: Stump the Expert

Post by n2582d »

c170b53 wrote:I took the flap drive system out of a Cessna XP about a year ago (the washer in that case was much thinner), it was just a horrible job as the through bolt had seized on the bearings. ...
Just to be clear Jim, you mean the through bolt had rusted to the bushing - the long hollow tube - correct? It's interesting that the ID of your washer looks smaller than mine. It looks to me that it is designed to fit under, rather than around, the 3/8" dia. bushing. Is the p/n of the washer the same for the XP? Could be my washer is not the correct ID???

I picked up a scrap early 172 wing from Faeth Aircraft for $30 to harvest some ribs for my wing rebuild. Since I had a 172 flap belcrank I practiced brazing a nut to the shaft to attach a zerk fitting to. Trying to figure out a way to better lubricate the bearings on either end of these bellcrank shafts. I think the ideal solution would be to find some sealed bearings.
IMG_0351.JPG
Last edited by n2582d on Wed Apr 19, 2017 5:19 am, edited 1 time in total.
Gary
User avatar
c170b53
Posts: 2527
Joined: Mon Apr 22, 2002 8:01 pm

Re: Stump the Expert

Post by c170b53 »

The bolt was seized solid on the bushing p/n 0523536. Could'nt even drive it out on the bench. Bushing is the same but p/n for the flap quadrant washer is different, good eye Gary.
The 79 Xp IPC lists the washer as s1450-20B12-032 for the flap quadrant
The aileron washer is 0522629-1 .
A true expect could figure out how Cessna numbers their parts
Bruce I on the other hand, like to consider myself more as the absent minded mechanic (professor) rather than expert.
Seeing as I had forgotten all about this, I obviously ..NAILED IT... :D
Jim McIntosh..
1953 C170B S/N 25656
02 K1200RS
User avatar
n2582d
Posts: 2808
Joined: Mon Apr 29, 2002 4:58 am

Re: Stump the Expert

Post by n2582d »

c170b53 wrote:... The 79 Xp IPC lists the washer as s1450-20B12-032 for the flap quadrant. The aileron washer is 0522629-1 ... .
Weird that they would list an original and a superseded p/n in the same IPC.
IMG_0348.JPG
The price, at $4, is a lot cheaper than the C-170 washer.
Gary
User avatar
Bruce Fenstermacher
Posts: 10313
Joined: Tue Apr 23, 2002 11:24 am

Re: Stump the Expert

Post by Bruce Fenstermacher »

n2582d wrote:
c170b53 wrote:... The 79 Xp IPC lists the washer as s1450-20B12-032 for the flap quadrant. The aileron washer is 0522629-1 ... .
Weird that they would list an original and a superseded p/n in the same IPC.
IMG_0348.JPG
The price, at $4, is a lot cheaper than the C-170 washer.
Guess Cessna has been weird since the 170 IPC as it list parts to be used until exhausted and the new number.
CAUTION - My forum posts may be worth what you paid for them!

Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
User avatar
c170b53
Posts: 2527
Joined: Mon Apr 22, 2002 8:01 pm

Re: Stump the Expert

Post by c170b53 »

image.jpeg
Here's the bushing/bolt removed.
Should someone have a stuck bolt, it's not easy to remove, as soon as you remove one end, the whole assy will wobble in the wing when you try to remove the other end. Best to start small at both ends and open up the holes in stages.
Jim McIntosh..
1953 C170B S/N 25656
02 K1200RS
User avatar
n2582d
Posts: 2808
Joined: Mon Apr 29, 2002 4:58 am

Re: Stump the Expert

Post by n2582d »

Wow, that looks like a fun job Jim! It must have been a challenge not to elongate the mounting holes in the wing.

I ended up making my brass washers using some .032" shim stock from the hobby store. $3 for K&S #8242. Drilling with a 7/8" hole saw made washers slightly under .75" OD.
Gary
User avatar
c170b53
Posts: 2527
Joined: Mon Apr 22, 2002 8:01 pm

Re: Stump the Expert

Post by c170b53 »

Exactly, it just took some patience to remove.
Great thing for me here! I find its amazing (really? :D ) that I fall to recognize I'm falling into the same trap; Cessna IPC's can be very misleading. The XP IPC did not break down the quadrant I was working on, so I thought it was an assembly I had to buy. I contacted a popular used parts supplier who had 50 plus NOS in stock. But they still wanted 50% of the new Cessna crazy price so I've been waffling. Now with this threads info, it's just the bolt and bushing I need, the IPC just missed listing them.
Jim McIntosh..
1953 C170B S/N 25656
02 K1200RS
User avatar
GAHorn
Posts: 20967
Joined: Fri Apr 12, 2002 8:45 pm

Re: Stump the Expert

Post by GAHorn »

I was told that Ex-spurt was the correct nomenclature.

EX=A has-been.

Spurt= A drip, under pressure.
'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. ;)
User avatar
n2582d
Posts: 2808
Joined: Mon Apr 29, 2002 4:58 am

Re: Stump the Expert

Post by n2582d »

Here's a NOS part I came across recently. Any guesses to what it's for? Anybody else still have this on their 170? 7/8" between mounting holes.
IMG_0566.JPG
Gary
User avatar
n2582d
Posts: 2808
Joined: Mon Apr 29, 2002 4:58 am

Re: Stump the Expert

Post by n2582d »

Fig. 35-60 in the 170B IPC. P/N 0511018 is a headphone hook. Looks like it would work better on the WWII style headphones with the two narrow bands than with a modern noise-canceling set.
IMG_0580.JPG
Gary
Post Reply