TM 5-3805-262-343-1. ENGINE MAINTENANCE (CONT)d. Cylinder Block (Cont).(2)CLEANINGTachometer Drive (Cont).AND INSPECTION (SHEET 2 OF 2)Compressed air used for cleaning purposes will not exceed 30 psi. Useonly with effective chip guarding and personal protective equipment(goggles/shield, gloves, etc). Failure to do so could cause seriousinjury to eyes and possible blindness. If you hurt your eyes or if aforeign object is blown into your eyes, seek medical attentionimmediately.(a) Immerse tachometer drive in cleaningsolvent P-D-680 and slowly move upand down to thoroughly clean inte-rior. Dry using compressed air.After drying, immerse tachometerdrive in clean engine oil and rotategear with fingers to lubricatebushings.(b) Inspect tachometer drive for crackedbody, chipped or broken drive gearteeth, excessively worn drive shaftor bushings, blocked oil hole, orthread damage. Rotate drive gearwith fingers and check that it turnssmoothly. Measure drive gear clear-ance using thickness gage. Replacetachometer drive as an assembly ifclearance is not 0.01 to 0.02 inchor if any of the above conditionsare seen.INSTALLATION(a) Lower tachometer drive into cylinder block bore. Mesh tachometer driveand engine gears, and rotate tachometer drive body until oil hole facesaway from engine.(b) Using soft hammer, carefully tap tachometer drive into bore until flushwith cylinder block.(c) Connect tachometer drive cable end to tachometer drive. Tighten cablenut using pliers.(d) Install engine left front side panel (refer to TM 5-3805-262-20).3-44
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