Lycoming Marvel Schebler MA-4SPA Carburetor Part Number Question

[Jon Wilder]

Hi all.

We have a 172M with a Marvel Schebler MA-4SPA carburetor, with an engine manufacturer part number of LW-13659-70. Can someone tell me what the -70 part of the part number indicates?

 

[Bell206]

Can someone tell me what the -70 part of the part number indicates?

You'll need to contact Lycoming tech support for that info, but typically it is to indicate a minor modification. However, since that carb core number (13659) has been superseded per the latest bulletin, the -70 may no longer be applicable.

 

[Domenick]

This link show the supersedure: https://msacarbs.com/technical-data/engine-eligibility/

10-5135

LW-13659

MA-4SPA™

SUPERCEDED BY 10-5217

 

[Klaus M]

There's also this Lycoming Service Letter:
https://www.lycoming.com/content/service-instruction-no-1523g

Just more references to confirm.

 

[Jon Wilder]

You'll need to contact Lycoming tech support for that info, but typically it is to indicate a minor modification. However, since that carb core number (13659) has been superseded per the latest bulletin, the -70 may no longer be applicable.

Thank you for that. I did end up contacting them. Their response is that -70 indicates the part was overhauled, -85 indicates the part was rebuilt, and no suffix would indicate new.