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TOHATSU MD 25B2 JET, Owner'S Manual

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TOHATSU MD 25B2 JET Owner'S Manual Download Page 16

14

15

As the blades wear, shims located in the stack outside of the impeller can be transferred behind the 
impeller. This will move the impeller further down into the tapered liner to reduce the clearance.

a - Shims
b - Clearance between impeller edge and liner

Check  the  impeller  clearance  by  sliding  a  feeler  gauge  through  the  intake  grate  and  measure 
the clearance between the impeller edge and liner. If adjustment is required, refer to 

Impeller 

Removal and Installation.

Replaceable Jet Drive Shear Key

The jet drive is equipped with a shear key to protect it in the event of a lodged impeller. The shear 
key can be reached by removing the water intake housing and impeller. Grease the drive shaft, 
shear key, and impeller bore when replace these parts. 

Refer to Maintenance-Impeller Removal 

and Installation.

a

b

M25 Jet Drive

MD25-35Jet_Owners_Sup_120216.indd   14

12/02/17   19:51

Summary of Contents for MD 25B2 JET

Page 1: ...OWNER S MANUAL MD 25B2 JET 35B2 JET Supplement No 003 11095 1 MD25 35Jet_Owners_Sup_120216 indd 1 12 02 17 19 51 ...

Page 2: ...MD25 35Jet_Owners_Sup_120216 indd 2 12 02 17 19 51 ...

Page 3: ... Water 10 Operating In Shallow Water 10 MAINTENANCE 11 Impeller Removal and Installation 11 Worn Dull Impeller 13 Steering Pull Adjustment 13 Impeller Clearance Adjustment 13 Replaceable Jet Drive Shear Key 14 Shift Cable Adjustment 15 Corrosion Control Anode 17 Lubricating the Driveshaft Bearing 17 TROUBLESHOOTING 19 Engine Over Speed Excessive RPM 19 Performance Loss 19 ENGINE INSTALLATION 20 Tr...

Page 4: ... Although the approximate balancing of forward and reverse thrust will minimize boat movement the boat may tend to move slowly forward or backward This is normal for a direct drive jet driven boat The operator should be aware of this and use caution whenever the engine is running Safety and operating information that is practiced along with using good common sense can help prevent personal injury ...

Page 5: ...O 15 1 384 Overall Height in mm 42 2 1 072 Recommended Transom Height in mm 22 6 573 Weight lbs kg EPO 196 2 89 EFO 202 8 92 Output Jet power PS kW 25 18 4 35 25 7 Horsepower PS kW 40 29 4 50 36 8 Max Operating Range 5 150 5 850 Number of Cylinders 3 Piston Displacement Cu in cc 42 5 697 Bore Stroke in mm 2 68 2 52 68 64 Exhaust System Jet Exhaust Lubrication System Oil injection Cooling System Wa...

Page 6: ...tle Grip c Stop Switch Lanyard dReverse Lock lever e Shift Cable f Drive Shaft Housing g Thrust Rod h Water Outlet i Jet Drive Housing j Battery Cable k Reverse Gate l Water Intake Housing m Shift Lever n Fuel Connecter o Stop Switch p Main Switch MD25 35Jet_Owners_Sup_120216 indd 4 12 02 17 19 51 ...

Page 7: ...the water in the opposite direction a c b a Water intake b Water outlet nozzle c Reverse gate When the jet drive is in neutral the impeller continues to rotate However the reverse gate is positioned so that some of the forward thrust is diverted to create reverse thrust This approximate balancing of forward and reverse thrust will minimize any boat movement Because the impeller is always rotating ...

Page 8: ...is form of propulsion WARNING Using the emergency stopping capability of a jet drive unit will slow down the boat in an emergency However sudden stopping may cause the occupants of the boat to be thrown forward or out of the boat resulting in serious injury or death Use caution when performing the emergency stopping procedure and be sure to practice in a safe area In an emergency putting the jet o...

Page 9: ...e jet pump Use caution when maneuvering at high speeds in areas where debris weeds logs gravel etc could be picked up into the jet drive The ability to take evasive action is dependent on sufficient water jet thrust to control the boat While steering the boat at engine speeds above idle the boat will respond quickly but due to the relatively flat bottom hulls and lack of a gearcase in the water th...

Page 10: ...ris physically removed from the grate Clearing A Lodged Impeller WARNING Rotating the flywheel to free a lodged impeller can accidentally start the engine resulting in serious injury or death Always turn the ignition key or lanyard stop switch to the OFF position and remove all spark plug leads from the spark plugs It is possible for debris to lodge between the impeller and jet housing wall especi...

Page 11: ... the ice is clear Pre Starting Check List Operator knows safe navigation boating and operating procedures An approved personal flotation device of suitable size for each person aboard and readily accessible it is the law A ring type life buoy or buoyant cushion designed to be thrown to a person in the water Know your boats maximum load capacity Look at the boat capacity plate Fuel supply OK Ensure...

Page 12: ...and water intake can be greatly increased by avoiding the intake of sand and gravel The intake suction will act like a dredge when the water intake comes close to the bottom It is better to stop the engine and drift up to shore when landing and to shove off with an oar when leaving The engine can idle through areas of water less than 61 cm 2 ft deep but there should be more than 61 cm 2 ft of wate...

Page 13: ...rn the ignition key or lanyard stop switch to the OFF position and remove the spark plug leads from the spark plugs while servicing the impeller 1 Position the key switch or lanyard stop switch to the OFF position 2 Remove the spark plug leads to prevent the engine from starting 3 Remove the six screws securing the water intake housing and remove the water intake housing MAINTENANCE M25 Jet Drive ...

Page 14: ...l the impeller straight off the shaft If the impeller is tight use a hammer and a block of wood to rotate the impeller clockwise on the shaft until the keyway is directly above the flat on the shaft This will free the jammed key and allow removal b a M25 Jet Drive MD25 35Jet_Owners_Sup_120216 indd 12 12 02 17 19 51 ...

Page 15: ...us by removing material from bottom side only Steering Pull Adjustment The steering on some boats will have the tendency to pull towards starboard This pulling condition can be corrected by using a pliers and bending the ends of the exhaust fins 1 16 in 1 5mm toward the starboard side of the outboard Impeller Clearance Adjustment The impeller should be adjusted so there is approximately 0 8 mm 0 0...

Page 16: ...and measure the clearance between the impeller edge and liner If adjustment is required refer to Impeller Removal and Installation Replaceable Jet Drive Shear Key The jet drive is equipped with a shear key to protect it in the event of a lodged impeller The shear key can be reached by removing the water intake housing and impeller Grease the drive shaft shear key and impeller bore when replace the...

Page 17: ...ring with water flow CHECKING SHIFT LINK ROD ADJUSTMENT Check the shift link rod adjustment in forward shift position The correct adjustment will position the shift cam far enough on the roller in order to lock the reverse gate into forward position The reverse gate should not be able to be forced up towards neutral Pull on the reverse gate by hand to verify a b c d e a b c d d F type P type a Shi...

Page 18: ...f shift cam groove as shown Correct Incorrect 2 Place the shift lever and shift cam into full forward position 3 Bring groove A to position B and secure the part B A M25 Jet Drive MD25 35Jet_Owners_Sup_120216 indd 16 12 02 17 19 51 ...

Page 19: ...t cable align the hole as shown and secure the part 5 The reverse gate should not be able to be forced up towards neutral Pull on the reverse gate by hand to verify M25 Jet Drive MD25 35Jet_Owners_Sup_120216 indd 17 12 02 17 19 51 ...

Page 20: ...ive coating on the anode as this will reduce effectiveness of the anode a Water intake housing anode Lubricating the Driveshaft Bearing Lubricate the driveshaft bearing before each use Description Where to used Part No Grease Drive shaft bearing 3HT 72309 0 Grease Gun Drive shaft bearing 3HT 65324 0 IMPORTANT It is important not to use a general all purpose grease for this bearing The lubricant re...

Page 21: ... pump in extra grease to purge out any moisture Visually inspecting the purged grease at this time will give an indication of conditions inside the bearing housing A gradual increase in moisture content indicates seal wear If the grease begins to turn dark or dirty gray the driveshaft bearingandsealsshouldbeinspectedandreplacedifnecessary Somediscoloration of the grease is normal during the break ...

Page 22: ...osition Cavitation of the impeller due to rough water or obstruction in the boat hull Blockage of the water intake Performance Loss POSSIBLE CAUSES Throttle not fully open Damaged impeller Incorrect engine timing adjustments or setup Boat overloaded or load improperly distributed Excessive water in bilge Boat bottom is dirty or damaged TROUBLESHOOTING M25 Jet Drive MD25 35Jet_Owners_Sup_120216 ind...

Page 23: ...nsom height If the boat transom is of insufficient height and the outboard cannot be installed to the recommended height cantact the boat manufacturer for recommended procedure to build up the boat transom Locate center line of the outboard Locate and mark with pencil the vertical centerline a of boat transom a C D A B a Centerline of transom C C 573 mm 22 6 in ENGINE INSTALLATION M25 Jet Drive MD...

Page 24: ...per height setting Installing the outboard too low on the transom will allow excessive drag BOATS WITH A V BOTTOM HULL 1 Measure the width of the leading edge on the water intake housing Make a horizontal line on the transom up from the V bottom the same length as the width of the water intake housing a b a Horizontal line b Width of the leading edge on the water intake housing 2 Place center the ...

Page 25: ...ating the boat the outboard driveshaft housing should be vertical or tilted toward the boat when planing to provide a scooping angle on the water intake Tilting the outboard out beyond a vertical position reduces the scoop angle and can cause impeller slippage and cavitation IMPORTANT If the angle of the boat transom does not allow the driveshaft housing to be positioned vertical a wedge kit shoul...

Page 26: ...e may be helpful in reducing cavitation when running in windy rough water conditions where air is sucked into the water intake when jumping waves Install a 0 8 mm 1 32 in metal plate that extends from the hull bottom to the top of the water intake housing This plate tends to reduce air intake as well as reduce spray a a Rough water plate M25 Jet Drive MD25 35Jet_Owners_Sup_120216 indd 24 12 02 17 ...

Page 27: ...MD25 35Jet_Owners_Sup_120216 indd 25 12 02 17 19 51 ...

Page 28: ...usawa Itabashi ku TOKYO 174 0051 JAPAN Phone TOKYO 03 3966 3117 FAX TOKYO 03 3966 2951 URL www tohatsu co jp Supplement 003 11095 1 1202 NB Printed in Japan OWNER S MANUAL MD 25B2 JET 35B2 JET MD25 35Jet_Owners_Sup_120216 indd 26 12 02 17 19 51 ...

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