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Help on the Hatz engine in the APU of a MLRS / Avenger?

keithf

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Hi experts, I recently purchased an APU (Auxiliary Power Unit) that I believe is from an Avenger or MLRS per google of NSN 6115014574189 - I need help finding the correct manuals for this - any-one been-there done-that?

I believe this has a Hatz 2G40 engine - on the oil filter side towards the flywheel, is a brass knurled circle that can be freely rotated either way - does any-one know what this does? A regular 2G40 engine does not have this.

Thank you! Keith.
 
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