TM 5-1940-277-34TROUBLESHOOTING PROCEDURES (Continued)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION14.BOAT VIBRATES WHILE UNDER WAY NOTENOTEBoat must be out of water on cradle or on hardstand for test or inspection.Step 1.One person in boat will open the hydrojet compartment hatch covers and remove the intake caseinspection covers. Then reach into the hydrojet unit and feel the front impeller for evidence of deformation or damage. After this inspection a second person using a strong light should look through the jet nozzle at the rear impeller while the first person slowly rotates the unit grasping either the shaft or coupling. Damage will most probably occur to the front impeller.a.If damaged impellers report to General Support.b.If impellers all right contact supervisor.Step 2.Check for loose engine mounting bolts (refer to page 2-161).2-19 (2-20 Blank)
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