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Old 01-20-2019, 10:35 AM
bryanflood's Avatar
bryanflood bryanflood is offline
Join Date: Aug 2006
Posts: 111
Default Main bearings

Does anyone know why there are so many different crankshaft bearings offered for Lycoming engines? The rebuild manual I have lists 3 different parts numbers for my crankshaft bearings.

LW-16047 (alternate)
LW-11021 (alternate)

It seems like Lycoming is saying that you can just use whatever you want, or is there a preference to a part number? I noticed superior also says that you can use part number


Can anyone help me figure out if there is some reasoning to this?


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Old 01-20-2019, 09:43 PM
Tommy123 Tommy123 is offline
Join Date: Jul 2018
Location: Naples fl
Posts: 140

Superseded numbers or may be oversized part numbers.
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Old 01-21-2019, 12:02 AM
az_gila's Avatar
az_gila az_gila is offline
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,897

LW-16047 is superseded by LW-11021

The 18D19394 is superseded by 18D26096

Oversize bearing have a dash number added with the oversize amount.

If your part catalog calls out the earlier number then either that number or the superseded number can be used.
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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Old 01-22-2019, 03:56 AM
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bryanflood bryanflood is offline
Join Date: Aug 2006
Posts: 111
Default Main bearings

Thanks Gil,

Exactly what i needed!

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