Lord differences.... what do they mean...
I spoke with a Lord's engineer today. He was very familiar with our aircraft and told me to use J-9613-40 or -49. As he put it 'which ever is cheaper' and further stated 'these are identical for your purposes' - apparently these different dash numbers reflect a Piper vs Cessna part.
Well, not exactly....
They both use a J-12334-1 spacer, and a J-9612-8 rubber block...
...but the -40 uses a J-7763-1 other side rubber block, and the -49 uses a J-7763-33 block.
My Tiger used to use the -49 (for the first 400 serial numbers) but then switched to a -59 which is the same as the two above, but with a J-7763-6 other side rubber block. This change apparently smoothed out vibrations transmitted to the airframe from the O-360-A4K motor (and raised the price 50%....
![Roll eyes :rolleyes: :rolleyes:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
...)
There do seem to be subtle changes in one of the side rubber blocks - which is the harder of the two rubber blocks.
The no longer around -45 part I mentioned above is similar, but uses a J-7763-10 hard side rubber block.
I wish that Lord would give a better description of what the actual changes in the rubber blocks are... which one is harder? ....by how much?
So.. the choices seem to be...
J-12334-1 spacer
plus
J-9612-8 soft side block
hard side choices...
J-7763-1 - salesman
or
J-7763-10 - original Vans
or
J-7763-33 - salesman
or
J-7763-6 - possible upgrade (Grumman) from the -33 part...
...and all seem to be applicable to O-360s.
gil A
PS - actual data from a Lord Technical Reference LB-571 document found on my copy of "Mechanic's Toolbox" from Vans, made by Sacramento Sky Ranch. The only place I could find real data....
PPS - for over $400 I would like (actually, expect) the best part if I pay the Lord premium...