TM  10-3930-638-24&P 3-5.   ENGINE   MAINTENANCE   (cont) f.  Tachometer  (cont). STEP LOCATION ITEM ACTION REMARKS CLEANING  (cont) 1 (cont) WARNING Wear safety glasses when drying parts with compressed air. Failure to do so could cause serious injury to eyes and possible blindness. If you hurt your eyes or if a foreign object is blown into your  eyes,  seek  medical  attention  immediately. 2 Tachometer  drive Clean Use cleaning solvent P-D-680. Dry thoroughly  with  compressed  air INSPECTION Tachometer  drive Inspect 3 Replace if body cracked or threads damaged, drive gear teeth chipped or broken, or if drive shaft or bushings excessively  worn INSTALLATION 4 Engine  compart- a. Tachometer drive Position In engine block hole ment, left side b. Tachometer drive Install Carefully tap with soft-faced hammer until top of body is flush with engine block c.  Tachometer  drive Install Turn clockwise on tachometer drive cover threads until hand-tight 3-52

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