The International Cessna^® 170 Association

Does anybody know the dimensions of the landing gear shim depicted as item 10 on page 50 of the parts manual. Part number 0541105. Just curious what material it's made out of and thickness and O.D. Thanks.

J. Simon

I have two new shims that I did not use when doing gear alignment.
I do not know which of the numbers indicate part numbers so this is all the numbers printed on part
#0541111-2 RJ44235
114 6817
and
71379-0441139-5
REV:F WO#38490
MFR-10854 5-2-03
and a used one with no part #
Any need them?

Did you perform a "search" for the word 'shim'?

See:
http://cessna170.org/phpBB2/viewtopic.php?p=33626#33626

I've seen the threads on wheel alignment shims and they are very useful. However, I was referring to the shim(s) which goes under the gear leg where it attaches inside the fuselage. It looks like a washer and is used to compensate for a wing-low situation. Just wondering how thick it is and what its made out of, etc. The reason I ask is because my airplane does have one wing slightly lower than the other, but it also has the p-ponk mod so I don't know how much clearance I have under the gear leg attach. Probably none if the mod was installed correctly. Thanks guys.

J Simon

I think it is just a washer.

MY BOOK SAYS TO USE A WASHER.

It's a common AN washer. And at gross weight, (full of fuel) on a level surface, your wingtips should be within 3-inches of the same distance from the ground. Until I worked on levelling a 170 and made comparisons between several of them, I hadn't noticed how many are not level at all. Don't bother with less than 3" IMHO. (Not exactly apples/apples but to get an idea of how one washer will affect things, try letting some air out of one tire and see what happens.)

Some advice while we're on the wing leveling topic!

If you are at all thinking of installing the "P Ponk" gear mod, be sure you do any necessary wing leveling before you install the mod. Once the mod is in, leveling becomes a major job requiring modification of the modification parts.

It was suggested that when installing the ponk beef-up use shims to keep the gap at or slightly larger than .750. My legs are about .700 but if I need to do an adjustment or go to the heavy .750 leg it can be done without having to mill the ponk part.

N171TD wrote:It was suggested that when installing the ponk beef-up use shims to keep the gap at or slightly larger than .750. My legs are about .700 but if I need to do an adjustment or go to the heavy .750 leg it can be done without having to mill the ponk part.

That seems like a pretty big gap. Is that supposed to be .075?

I assume he means the gap without the gear leg in place.

Sorry will try to clarify:
The gap without gear leg in place ( distance between gear block and bottom of ponk block ) aprox .750.
If your leg is .700 you will need a .050 shim.
This makes it much easier to attach leg.
Now if you go to a late 180 leg you do not have to mill the ponk block

I bought two 0541105 shims when I converted my 172.
They are .065 X 1.00 X 1.25 aluminum sheet stock with a .500 hole in the center.
Adding one shim will change the height by about 1.5 - 2 inches at the wing tip.

53B, Thanks, exactly what I was looking for.