Lord Cowl Snubber Mounts

[Marc_B]

Are these still available?  showing J7444-34 for the part number, but coming up with other -numbers available online.  Wondering if this has been superceded by another part or just unavailable so use a different part number to replace?  #33 in the picture below.  It's the snubber mount for the cowl. Here's a -24 on Spruce.  I think this is what a previous shop used for replacement...  Is there any difference between -24 and -34 regarding thickness or durometer of snubber or just type of receptacle in the center??

On a little further digging, it seems like the J7444 is the snubber and the -number may be the receptacle (i.e. camloc or other)?  But I've found J7444-14 vs -24 vs -36(that was superseded by -42)...

J-7444-14: This is for use with Southco fasteners
J-7444-24: For use with 2600/2700 camloc
J-7444-36: For use with 4000 series camloc
J-7444-42: For use with 4000 series camloc

Also found a Skybolt replacements for same...since they are used as a snubber without any center fastener, are they all equivalent for Mooney use??

[1980Mooney]

I believe that they are.  Here is a topic from the past.  Clarence, formerly M20Doc before the bastards here ran him off, provides helpful clarification.

Also below is Mooney Service Instruction 67 from 1983.  Mooney originally used J7444-30 mounts and fasteners but changed to the -34.  It has some useful instructions on how to replace.

SIM20-67.pdf

 

[Marc_B]

@1980Mooney From the Lord drawings the J7444 snubbers are all the same thickness, but different center receptacles.  However, I'm not sure if the material used is the same.  Lord said that they haven't produced the -34 part since 2008 and sold the last batch to Mooney at that time.  Specifically the -34 part was listed with "chlorobutyl" and the others were just listed as "rubber".  Not sure if this translates into a different material or durometer or not???  I'm not sure what material the Skybolt equivalents use.  I presume the thickness is the same??

[1980Mooney]

1 hour ago, Marc_B said:

@1980Mooney From the Lord drawings the J7444 snubbers are all the same thickness, but different center receptacles.  However, I'm not sure if the material used is the same.  Lord said that they haven't produced the -34 part since 2008 and sold the last batch to Mooney at that time.  Specifically the -34 part was listed with "chlorobutyl" and the others were just listed as "rubber".  Not sure if this translates into a different material or durometer or not???  I'm not sure what material the Skybolt equivalents use.  I presume the thickness is the same??

As you said, the dimensions are the same, so that means they use the same mold for the elastomer – the only difference is the composition of the elastomer. Chlorobutyl rubber is just a more durable version of butyl rubber. In comparison to butyl rubber, chlorobutyl rubber offers the following advantages: Better resistance to ozone, heat, flex fatigue, improved compression set, lower permeability to moisture, gases, and air. 

But this is not a high-performance application – it’s just a cowl fastener.  You mentioned Durometer specs - You’re never gonna know the difference. How long did the original chlorobutyl last before it got hard or deteriorated?30 years – 40 years?  Maybe plain butyl rubber gets hard faster and only lasts 25 years…..

I am not A&P but I think you’re just gonna be just fine. You just need to get the right fastener hardware to match the center.  
 

Edited Monday at 11:15 PM by 1980Mooney