M20C (But M20J ARI Cowl Enclosure Mod) Prop Bulkhead Help! (680031-027)

[OneSaltyItalian]

Hello friends,

My A&P and I went to replace my starter today following a failed start attempt last week.  After diagnosing and decided we needed to remove, I found the following on our close inspection (pictures).

From my research, it looks like it's the J model unobtanium 680031-027.  Dog picture for size reference :P.  Does anyone have any leads on this part or know of ways to alleviate my (even longer now) grounded plane?  Shop that will fix it?  Any and all ideas are appreciated.  Oh, it also split the shroud in that location in half.  It still connects via the screw hole, but it does not connect together.

Prop and other information:

Propeller Model: HC-C2YK-1BF

https://aeroresourcesinc.com/proj98-ci/WebContent/uploads/ARI 1955-78_M20J_Spinner_Instructions.pdf

 

I saw the other thread about this, but figured I would make a new one since I have not seen anything about this recently.

 

Edited June 17 by OneSaltyItalian

[Sabremech]

There is another spinner and backplate you can run with the ARI enclosure. I’ll get the P/N’s later this afternoon. 
David

[OneSaltyItalian]

2 hours ago, Sabremech said:

There is another spinner and backplate you can run with the ARI enclosure. I’ll get the P/N’s later this afternoon. 
David

That would be amazing. Please let me know

[Sabremech]

Assembly P/N is A2295-5P. Spinner P/N is C-3532-22P and bulkhead is C2294-11P. I had this on my C with the Hartzell prop and ARI cowl enclosure. It’s the same diameter as the J spinner you have but the bulkhead mounts to the prop hub and not the flywheel. Much beefier part and not likely to crack.

 

[Old Chub]

Anyone else have concern over that deep (gouge) interference contact area right through the crack zone ?   Maybe the worst I have ever seen.  That would need to be addressed or corrected before a replacement is installed IMO. 

 

[MB65E]

This is why it cracked. The dome wasn’t supported properly. I use teflon tape to keep the spinner tight on the hub. 
 

Edited June 18 by MB65E

[OneSaltyItalian]

2 hours ago, MB65E said:

This is why it cracked. The dome wasn’t supported properly. I use teflon tape to keep the spinner tight on the hub. 
 

I saw that in the other post as well - absolutely agree 

[OneSaltyItalian]

On 6/17/2025 at 6:57 PM, Sabremech said:

Assembly P/N is A2295-5P. Spinner P/N is C-3532-22P and bulkhead is C2294-11P. I had this on my C with the Hartzell prop and ARI cowl enclosure. It’s the same diameter as the J spinner you have but the bulkhead mounts to the prop hub and not the flywheel. Much beefier part and not likely to crack.

 

I'm sorry for the question, but do you know the legality of this since the STC requires the different part number?  I'll ask my IA his thoughts next week, he's currently on vacation.  My A&P (friend) and I will be pulling the prop this weekend and also are going to put in a new alternator belt since we're there already... lol.

[Sabremech]

2 hours ago, OneSaltyItalian said:

I'm sorry for the question, but do you know the legality of this since the STC requires the different part number?  I'll ask my IA his thoughts next week, he's currently on vacation.  My A&P (friend) and I will be pulling the prop this weekend and also are going to put in a new alternator belt since we're there already... lol.

This spinner and bulkhead were part of the ARI enclosure STC on my airplane. Here’s a screen shot from Aero Resources Inc data I found online. Maybe this will help you as I’m not sure if ARI is still in business now. 
 

David

[OneSaltyItalian]

On 6/19/2025 at 9:17 PM, Sabremech said:

This spinner and bulkhead were part of the ARI enclosure STC on my airplane. Here’s a screen shot from Aero Resources Inc data I found online. Maybe this will help you as I’m not sure if ARI is still in business now. 
 

David

Thanks!

Now my search starts for that C-3532-22... Any luck if you have an extra laying around?  Lol

[Sabremech]

14 minutes ago, OneSaltyItalian said:

Thanks!

Now my search starts for that C-3532-22... Any luck if you have an extra laying around?  Lol

Look for the A2295-5P as that should include the backplate. You’ll also need the installation kit. I don’t think your spinner will fit the backplate. I purchased 2 spinner assemblies from Hartzell a few years ago. They weren’t terribly expensive at that time but don’t know what they are currently.

Thanks,

David

[OneSaltyItalian]

32 minutes ago, Sabremech said:

Look for the A2295-5P as that should include the backplate. You’ll also need the installation kit. I don’t think your spinner will fit the backplate. I purchased 2 spinner assemblies from Hartzell a few years ago. They weren’t terribly expensive at that time but don’t know what they are currently.

Thanks,

David

Perfect. I'll call Hartzell this afternoon and see what they have to say.  Appreciate you for the assistance