Squat-method landing gear disc replacement

[FlyingDude 1]

How do I tell if my '67 M20E has the new or old style donuts/gear? I have 3 donuts in the nose gear whereas the diagrams in the parts manual show 4 donuts in the nose gear. Can we say that the 4-donut version is the old style and 3-donut solution is the new style?

Thank you.

Edited Wednesday at 05:33 PM by FlyingDude

[mike20papa 192]

AN9 -24A is what is called out in my A model book for the bolt at bottom of shock tower.  Double check the grip length, but I bet these are the same thru the J.

[Andy95W 4,266]

1 hour ago, FlyingDude said:

How do I tell if my '67 M20E has the new or old style donuts/gear? I have 3 donuts in the nose gear whereas the diagrams in the parts manual show 4 donuts in the nose gear. Can we say that the 4-donut version is the old style and 3-donut solution is the new style?

Thank you.

Yes, that is correct.  Nosegear 3 discs=new style.

[carusoam 11,988]

The old Firestone donuts look like spindly legs...

They would stand out when parked next to any other Mooney.... each stack had an extra donut count...

Essentially the same height, just different donut dimensions....

PP thoughts only, not a mechanic...

Best regards,

-a-

[PilotCoyote 361]

Firestone

[carusoam 11,988]

Spindly!

 

That first donut has been completely compressed...

Go MS!

-a-

[cliffy 1,969]

How much do you want to bet that the "special" bolts are in fact standard AN bolts that have been ground or milled to the design needed to fit the application?

[mike20papa 192]

Just as a note .. when changing out the donuts on my (low time) A model - the most worn parts in the gear where the two pivot bolts that attach the nose wheel trunnion to the airframe.  They were deformed and allowing play into the retract mechanism. Would suggest inspecting these at nose gear OH.  Joe

[Andy95W 4,266]

1 hour ago, mike20papa said:

Just as a note .. when changing out the donuts on my (low time) A model - the most worn parts in the gear where the two pivot bolts that attach the nose wheel trunnion to the airframe.  They were deformed and allowing play into the retract mechanism. Would suggest inspecting these at nose gear OH.  Joe

⬆️⬆️⬆️ I second that recommendation. 

LASAR has oversized bushings and bearings that are PMA’ed for our landing gear.

[EricJ 2,394]

16 hours ago, carusoam said:

Spindly!

 

That first donut has been completely compressed...

Go MS!

-a-

I noticed that, too, and was wondering whether the Firestone units were designed for a progressive rate or something.