LOWER U N IT
8-51
JET DRIVE Description and Operation The jet drive unit is designed to permit boating in areas prohibited to a boat equipped with a conventional propeller drive system. The housing of the jet drive barely extends below the hull of the boat allowing passage in ankle deep water, white water rapids and over sand bars or in shoal water which would foul a propeller drive. The jet drive provides reliable propulsion with a minimum of moving parts. Simply stated, water is drawn into the unit through an intake gri l le by an impeller driven by a driveshaft off the crankshaft of the powerhead. The water is immediately expelled under pressure through an outlet nozzle directed away from the stern of the boat As the speed of the boat increases and reaches planing speed, the jet drive discharges water freely into the air and only the intake grille makes contact with the water. The jet drive is provided with a gate arrangement and linkage to permit the boat to be operated in reverse. When the gate is moved downward over the exhaust nozzle, the pressure stream is reversed by the gate and the boat moves sternward. Conventional controls are used for powerhead speed, movement of the boat, shifting and power trim and tilt
Model Identification and Serial Numbers • See Figure 50 A model letter identification is stamped on the rear, port side of the jet drive housing. A serial number for the unit is stamped on the starboard side of the jet drive housing, as indicated in the accompanying i llustration. The jet drives that are used with the outboard units covered in this manual are: PU40, PU55, PU85 and PU1 40. These letters are embossed on the port side of the jet drive housing. These numbers reflect the specific size of engine which they are attached to. For the most part, jet drive units are identical in design, function and opera tion. Differences lie in size and securing hardware.
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Fig. 50 The model letter designation and the serial numbers are embossed on the jet drive housing
Jet Drive Assembly REMOVAL & I NSTALLATION • See accompanying illustrations 1 . Remove the two bolts and retainer securing the shift cable to the shift cable support bracket 2. Remove the locknut, bolt and washer securing the shift cable to the shift arm. Try not to disturb the length of the cable. 3. Remove the six bolts securing the intake gri l le to the jet casing. 4. Ease the intake grille from the jet drive housing.
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Step 3