Lubrication / Fuel selection / Recommended fuel/oil mixture ration / Fuel mixing / Gearcase lubrication / Gearcase lubricant change / Salt water corrosion on gearcase bearing cage and spool / Storage / Complete submersion / Anti-corrosion maintenance / Engine flushing / Tune-up / Compression check / Spark plugs / Gearcase and water pump check / Fuel system service / Fuel lines and hoses / Fuel filter service / Fuel pump service / Fuel pump pressure test / Breaker point ignition system service / Breaker point replacement / Breaker point adjustment / Battery and starter check (electric start models only) / Starter relay resistance check (electric start models only) / Choke solenoid resistance check (DT30-DT140 electric start models only) / Engine synchronization and adjustment / On-boat performance testing / SpecificationsĬHAPTER FIVE / TIMING, SYNCHRONIZATION AND ADJUSTMENTĮngine timing and synchronization / Specificationsįuel pump / Carburetor removal/installation / Carburetor overhaul/adjustment / Throttle plunger carburetor (DT 2) / Throttle plunger carburetor (DT 7.5 and DT 9) / Centerbowl carburetor (DT 3.5-DT 16) / Integral fuel pump carburetor / Centerbowl carburetor (DT 20-DT 140) / Carburetor cleaning and inspection / Reed valve assembly / Fuel tank / Fuel line and primer bulb / Specificationsīattery / Lighting system / Battery charging system / Electrical starting system / Starter motor / Ignition motor / Magneto breaker-point ignition / PEI ignition / SpecificationsĮngine serial number / Fasteners and torque / Flywheel / Power head / Specifications Operating requirements/ Starting system / Lighting system / Charging system / Ignition system / Breaker-point ignition component testing / PEI ignition component testing / Fuel system / Engine temperature and overheating / EngineĬHAPTER FOUR / LUBRICATION, MAINTENANCE AND TUNE-UP Safety first / Basic hand tools / Test equipment / Service hints / Special tips / Mechanicâ?s techniques I could post a picture of the offending hole if anyone wants to see it.Manual organization / Notes, cautions and warnings / Torque specifications / Engine operation / Fasteners / Lubricants / Gasket sealant / Galvanic corrosion / Propellers / Specifications By the way, I had just replaced the impeller gasket, water tube grommet, and shaft seal so exhaust wasn’t pushing through any of those. If you have the offending hole, I would recommend using a stainless steel nut, washer and bolt with a countersunk head to fill it. This will show you if it is an exhaust back pressure issue and if you should check to see if you have the hole in your impeller housing. The problem also can be identified by removing your plastic gear shift linkage cover to relieve pressure and seeing if your motor starts to pee again. I’m pretty sure it is going to fix the issue. Anyway, I didn't have time to cover this hole to see if it would cure the problem but I will try it this summer. Has nobody else noticed this hole or is it just my motor that has it? This would explain everyone’s problem it seems to me. This would appear to allow all the pressure from the exhaust to be blown right down into the impeller area and thereby creating unwanted back pressure in the impeller housing. ![]() Last summer I took apart my newly purchased (used) DT4 to replace the impeller and noticed there is what appears to be a factory made hole! on the impeller housing just under where the tube attaches to the top of the housing. ![]() I have a DT4 and have been reading multiple discussions on the cooling and peeing problem on the DT4 which mine also has.
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