Play in trim shaft, normal?

[Flyingfisher]

Hi guys, in annual and underneath the belly we noticed the shaft that goes from the trim wheel back to the tail has a LOT of play in it. I ordered new bushings for where it is captured along the airframe (NMC557-16A) but it will still have a lot of play. Is this normal? And if not what fixes this?

[carusoam]

Great video evidence, fish!

having a control rod slopping around that much can’t be right...

We know a guy... @M20Doc

That can probably make a recommendation on that...

When the painted surface is getting rubbed off, that is a sign of something outside the norm...

Best regards,

-a-

[Guest]

17 minutes ago, Flyingfisher said:

Hi guys, in annual and underneath the belly we noticed the shaft that goes from the trim wheel back to the tail has a LOT of play in it. I ordered new bushings for where it is captured along the airframe (NMC557-16A) but it will still have a lot of play. Is this normal? And if not what fixes this?

That amount of play in the trim shafts is normal.  Just be sure that all of the nylon bushings are in all of the hangers and the the wear sleeve is in place on the trim shafts.  The allowable wear limit is only 0.007”.

Clarence

[1964-M20E]

Is the video before replacing the blocks?

Clean the spots where the blocks are and check the wear as Doc suggested.

The @M20Doc has spoken but I am with you it appears to be a lot of play.  I'm just an owner/pilot not a mechanic.  However, I do owner assisted annuals and I slept at a hotel somewhere in the past.

 

[Flyingfisher]

Thank you very much no the blocks have not been replaced. This is what they sent me. The ones on the plane are worn to the aluminum. 

[Prior owner]

My rods also have play (nothing like in that video), but there are no nylon rings installed..was this a change in design? They aren’t in the parts diagram either... are wear sleeves available for earlier models?

Edited October 8, 2018 by PilotCoyote

[Guest]

This might help. Trim tube inspection and maintenance.

https://cdn2.hubspot.net/hubfs/4147179/technical_documents/service_bulletins/sbm20-185-1.pdf?t=1538510999477

Clarence

[Guest]

1 hour ago, 1964-M20E said:

Is the video before replacing the blocks?

Clean the spots where the blocks are and check the wear as Doc suggested.

The @M20Doc has spoken but I am with you it appears to be a lot of play.  I'm just an owner/pilot not a mechanic.  However, I do owner assisted annuals and I slept at a hotel somewhere in the past.

 

This is quite normal, there is about 1/8” difference in tube size to bushing size.

Clarence

[Flyingfisher]

11 minutes ago, M20Doc said:

This might help. Trim tube inspection and maintenance.

https://cdn2.hubspot.net/hubfs/4147179/technical_documents/service_bulletins/sbm20-185-1.pdf?t=1538510999477

Clarence

Thanks!! Interesting they want poly tape on the joints. Extremely helpful.

[tony]

My F model has that rod running through a phenolic block.  I don't see any in your video.  

[Prior owner]

Thanks Doc.  Unfortunately will not apply to my ‘64,....

[1964-M20E]

43 minutes ago, tony said:

My F model has that rod running through a phenolic block.  I don't see any in your video.  

According to the SB it looks like they made a change in 68.

[Flyingfisher]

2 hours ago, tony said:

My F model has that rod running through a phenolic block.  I don't see any in your video.  

As others have stated there was a design change. Thanks for weighing in

[Prior owner]

Ok, I should have read the entire Bulletin. Older serial numbered aircraft can be converted to the nylon style bearing. Thanks for posting that bulletin- I thought I had read them all..

[M20F-1968]

There were originally phenolic blocks which served as a means to reduce the hole in the aluminum and act as a guide. However, the phenolic material itself was abrasive.  With a DER approval we made similar blocks out of nylon which not only act as nore effective guides, but also are much less abrasive.  They are installed just as the phenolic blocks were installed.

John Breda

[M20F-1968]

There were originally phenolic blocks which served as a means to reduce the hole in the aluminum and act as a guide. However, the phenolic material itself was abrasive.  With a DER approval we made similar blocks out of nylon which not only act as more effective guides, but also are much less abrasive.  They are installed just as the phenolic blocks were installed.

John Breda

[Prior owner]

It’s too bad that so many of these were not serviced properly, causing grime to sand the tubes down. 

[bradp]

Great videos- those were totally clear.  

[Guest]

6 hours ago, PilotCoyote said:

It’s too bad that so many of these were not serviced properly, causing grime to sand the tubes down. 

With a sub $1000 annual that many boast of here, some parts don’t get looked at.  This may be one of those items.

Clarence

[Yetti]

Your bilge is very dirty.  Some rags and varasol should help.

[Flyingfisher]

4 hours ago, Yetti said:

Your bilge is very dirty.  Some rags and varasol should help.

We cleaned EVERYTHING... rebuilt the gear, looked in every panel, took mineral spirits to the greasy bits in the belly, it's clear to me this plane hasn't had a thorough annual in 10+ years. Joy of joys I get to eat the $7k annual... who wants to knowingly fly in a plane thats been half ass maintained? On the plus side the gear looks great, haha... 

Edited October 10, 2018 by Flyingfisher

[Yetti]

Might of wanted to turn the prop 90 degrees when doing that.   Just in case you did drop it.     And some secondary saw horses under the wings could keep from getting people squished.  Also you only need to clear by about 3 or 4 inches. That's way up in the sky.  Everything in CA is more expensive.   I could not afford a CA Annual.

[Flyingfisher]

1 hour ago, Yetti said:

Might of wanted to turn the prop 90 degrees when doing that.   Just in case you did drop it.     And some secondary saw horses under the wings could keep from getting people squished.  Also you only need to clear by about 3 or 4 inches. That's way up in the sky.  Everything in CA is more expensive.   I could not afford a CA Annual.

Probably. We had the jacks pinned, and barring an earthquake she wasn't going anywhere. She's so high because we were rolling around under her with a crawler and it was a nice height to work on the belly. California is ridiculous... I'll be the first to admit, but the cost was lower than it could have been, I helped a ton. 770 dollar fuel sender from Lasar, 1200 dollars in landing shock discs,  a 550 dollar shock link, a couple new tires, a new trim torque tube it adds up pretty quick  Oh and as for the prop... yeah I should have turned it to check the gear, but its like that because I walked into it and cut my face open on day 2 haha...

 

Edited October 10, 2018 by Flyingfisher

[carusoam]

Becoming one with your Mooney is supposed to be a metaphor!  

Best regards,

-a-

[Guest]

On 10/10/2018 at 10:11 AM, Flyingfisher said:

Probably. We had the jacks pinned, and barring an earthquake she wasn't going anywhere. She's so high because we were rolling around under her with a crawler and it was a nice height to work on the belly. California is ridiculous... I'll be the first to admit, but the cost was lower than it could have been, I helped a ton. 770 dollar fuel sender from Lasar, 1200 dollars in landing shock discs,  a 550 dollar shock link, a couple new tires, a new trim torque tube it adds up pretty quick  Oh and as for the prop... yeah I should have turned it to check the gear, but its like that because I walked into it and cut my face open on day 2 haha...

 

Sounds like you’re giving your Mooney the attention it deserves.  Well done.

Clarence