Mechanics,
When doing annual services on the M113A3 FOV, including the MBT and OSV, be sure to replace the variable speed fan drive’s gear spur.
The gear spur, NSN 3020-01-241-9141, can wear out sooner than it should, possibly leading to engine fires.
This applies to both engine models, NSN 2815-01-412-2715 and NSN 2815-01-248-7644. It also applies whether the engine is equipped with the hydraulic speed fan drive, NSN 2930-01-320-0530, or the electronic variable speed fan drive, NSN 2930-01-644-5574.