Universal Atomic 4 Manual
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Universal Atomic 4 Manual

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ENGINE OPERATION
TO INSURE PROPER OPERATION OF YOU ENGINE AT ALL TIMES, IT IS WELL TO OBSERVE
BASIC RULES. THIS IS ESPECIALLY TRUE DURING WINTER MONTHS WHEN THE BOAT IS
EITHER IN STORAGE OR USED INFREQUENTLY.
SEE THE INSTRUCTION BOOK FOR PREPARING THE ENGINE FOR WINTER STORAGE. IN
ADDITION TO FOGGING THE ENGINE, WE ALSO SUGGEST THAT OIL BE PLACED IN EACH
CYLINDER AND THE ENGINE TURNED OVER THREE (3) OR FOUR (4) TIMES TO INSURE
ADDED PROTECTION FOR THE VALVES DURING STORAGE.
DURING COLDER WEATHER WHEN BOATS ARE NOT USED REGULARLY, THE ENGINES
REQUIRE EXTRA CARE AND ATTENTION. WHENEVER THE ENGINE IS PLACED IN
OPERATION, IT SHOULD BE RUN UNTIL THE ENGINE IS THOROUGHLY WARMED UP TO
NORMAL OPERATING TEMPERATURE AND THEN IT SHOULD BE OPERATED AT THIS
TEMPERATURE FOR 15 TO 30 MINUTES. JUST STARTING AN ENGINE BRIEFLY CHANGES THE
TEMPERATURE SLIGHTLY AND INDUCES CONDENSATION TO FORM. THIS CONDITION IS
ONE OF THE MAIN CAUSES FOR STICKY VALVES.
IF THE BOAT WILL NOT BE USED FOR A MONTH OR SO, IT IS WELL TO FOG THE ENGINE
AND PLACE OIL IN THE CYLINDERS. IT IS NOT ALWAYS POSSIBLE TO CLOSE THE EXHAUST
AND THE VALVE MECHANISM IS EXPOSED TO SALT AIR BACKING UP THE EXHAUST PIPE.
ALSO, CONDENSATION FORMS INTERNALLY DURING STORAGE. DO NOT JUST START THE
ENGINE EACH WEEK OR SO AND RUN IT FOR A FEW MINUTES. SEE PRECEDING
PARAGRAPH.
REMEMBER, YOUR BOAT IS IN THE WATER AND SUBJECT TO THE CORROSIVE ACTION OF

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  • Page 1 ENGINE OPERATION TO INSURE PROPER OPERATION OF YOU ENGINE AT ALL TIMES, IT IS WELL TO OBSERVE BASIC RULES. THIS IS ESPECIALLY TRUE DURING WINTER MONTHS WHEN THE BOAT IS EITHER IN STORAGE OR USED INFREQUENTLY. SEE THE INSTRUCTION BOOK FOR PREPARING THE ENGINE FOR WINTER STORAGE. IN ADDITION TO FOGGING THE ENGINE, WE ALSO SUGGEST THAT OIL BE PLACED IN EACH CYLINDER AND THE ENGINE TURNED OVER THREE (3) OR FOUR (4) TIMES TO INSURE ADDED PROTECTION FOR THE VALVES DURING STORAGE.
  • Page 2 SALT AIR AND WATER. PROBLEMS THAT MIGHT DEVELOP DUE TO IMPROPER CARE OR OPERATION IN THE FIELD CANNOT BE CONSIDERED AN ENGINE DEFECT AND ARE NOT COVERED BY THE NORMAL ENGINE WARRANTY. IT IS IMPORTANT TO CHANGE OIL FREQUENTLY AS RECOMMENDED IN THE OWNERS MANUAL.
  • Page 3 THE MANUFACTURER RESERVES THE RIGHT TO MAKE PRODUCT IMPROVEMENTS AT ANY TIME WITHOUT TAKING RESPONSIBILITY OR OBLIGATION TO MAKE SIMILAR CHANGES OR ADD SIMILAR IMPROVEMENTS ON ANY ENGINES DELIVERED PRIOR TO THOSE CHANGES. WARRANTY REGISTRATION ENCLOSED WITH EACH ENGINE IS A WARRANTY REGISTRATION CARD. THIS CARD MUST CONTAIN THE OWNER=S NAME, ADDRESS, SERIAL NUMBER OF THE ENGINE, V-DRIVE AND REVERSE GEARS AND RETURNED TO MEDALIST BEFORE THE WARRANTY BECOMES EFFECTIVE.
  • Page 5 Models UJ, UJS, UJR, UJSR, UJVD Type Vertical, 4 cycle, L-head Number of Cylinders Bore and Stroke 2-9/16" x 3-1/8" Total Piston Displacement in cu. Inches 64.46 Spark Plug Champion J-8 14mm. Compression Ratio 6.3 to 1 Engine Rotation Counter-Clockwise Viewed from Flywheel End Reduction Gear Ratio 2.04 to 1 V-Drive Reduction Ratios...
  • Page 6 Piston Ring Cap Clearance .007 to .015 Connecting Rod End Play .004 to .008 Crankshaft End Play - Maintained at front bearing only .002 to .003 Valve seat angle 45 degrees Oil pump drive end play .001 to .003 Distributor point gap clearance .018 to .020 Magneto Breaker Point .014 to .018...

  • Page 7: General Instructions

    Main Bearing - rear 60 ft. lbs. Manifold Studs 35 ft. lbs. Spark Plugs 30 ft. lbs. Note to Atomic Stevedore Owners - All instructions in this book apply equally to Atomic Four and Atomic Stevedore models. Where there is a difference in specifications or adjustments it is so indicated. GENERAL INSTRUCTIONS Give your engine every chance to perform properly.
  • Page 8 Exhaust pipe is 1-1/4" iron pipe size. It should be installed without sharp bends and slop downward to its outlet to discharge water. The connection for discharge water should be at least 4" below the bottom of the manifold exhaust flange opening. See Figure 1. Suggestions before starting your new engine: CAUTION: ENGINE IS SHIPPED LESS OIL.
  • Page 9 After the break-in period a good cruising speed for sail boat installations is about 2000 RPM or about 80% of the maximum engine speed obtainable. ZENITH MARINE CARBURETORS 61 Series - 1967 and before 1 Venturi 2 Main Jet 3 Main Dis. Jet 4 Well Vent 5 Idling Jet 6 Idling Needle Valve...
  • Page 10 3. The main jet adjustment (14) 2-1/2 turns open (to left) from seat. ADJUSTMENTS If the engine, after running satisfactorily, suddenly ceases to perform properly, look over the intake manifold and the carburetor flange gaskets, throttle, choke and fuel connections. Make sure that throttle and choke valves open and close correctly and that fuel enters the carburetor in a free and steady stream.

  • Page 11: Fuel Level

    well vent and a leaner mixture with a larger well vent. If the mixture suddenly becomes too rich at high speeds, examine the well vent and make sure that it is not obstructed. Inspect these jets for water and dirt. STARTING Open the throttle about one-quarter.

  • Page 12: Idle System

    The fuel supply system is made up of the threaded fuel inlet, the fuel valve seat, fuel valve need, float and fuel boat, as illustrated in Figure A. The fuel supply line is connected to the threaded inlet. The fuel travels through the fuel valve seat and passes around the fuel valve and into the fuel bowl.

  • Page 13: High Speed System

    The idle system as shown in Figure B, consists of two idle discharge holes, idle air passage, idle adjusting needle, idle jet, and fuel pick-up passage. The fuel for idle is supplied through the main jet to a well directly below the main discharge jet. The pick-up passage is connected to this well by a restricted drilling at the bottom of this passage.

  • Page 14: Choke System

    At high speeds the fuel flows from the fuel chamber through the main jet and into the main discharge jet where it is mixed with air admitted by the well vent, and the air-fuel mixture is then discharged into the air stream of the carburetor.

  • Page 15: Electrical Systems

    depth gauge. NOTE: Do not bend, twist or apply pressure on the float bodies. With bowl cover assembly in an inverted position, viewed from free end of float, the float bodies must be centered and at right angles to the machined surface. The float setting is measured from the machine surface (no gasket) of cover to top side of flat bodies at highest point.

  • Page 17: Water Temperature

    WATER COOLING SYSTEMS The two drain plugs and a pipe cap removed at the factory are in a small bag attached to the barburetor lever. Replace one plug in the bottom of water pum and one in the rear of the manifold near the exhaust flange.
  • Page 18 PREPARING ENGINE FOR SPRING SERVICE Preparation of the engine should include all these items of overhaul necessary to permit satisfactory operation of the engine. Many engines properly serviced in the spring will give a full season of carefree pleasure. The amount of effort to be expended will be determined somewhat by the storage of lay-up procedure of the previous fall.
  • Page 19 operation of engine. 10. Starting Motor - See that the starter pinion is clean and lubricated with light oil. Remove any moisture seals. Lubricate bearings. Clean commutator and brushes with sandpaper. Do not use emery cloth. 11. Alternator - Does not require any special care or lubrication. 12.
  • Page 20 and clearances. The pump should be carefully drained by loosening the cover. The pump should be dry during the winter. 6. Electrical system - Remove the battery and store it at the boat yard or at your local battery dealer. Loosen the distributor cap for ventilation and protect all other electrical parts for moisture.

  • Page 21: Troubleshooting

    If the fuel system is O.K. check as follows for ignition troubles. FIRST: Be sure the ignition switch is turned to the "ON" position. SECOND: Look for a fouled or broken spark plug. THIRD: Check for weak spark. If a bright spark jumps across the gap between the two points of the plug when the engine is turned over, the ignition system is undoubtedly in working order.
  • Page 22 Jammed Bendix Loosen starter motor to free gear gear Defective Starter Replace motor Motor Starter Partially Charge or replace battery motor turns discharged battery but does not crank engine Defective wiring or Check wiring for worn acid spots. wiring of too low capacity Broken Bendix Remove starter motor and repair drive...
  • Page 23 too low Engine will Ignition switch "off" Turn on switch or replace not start. or defective (Ignition System) Fouled or broken Remove plugs and inspect for cracked porcelain, dirty points, or spark plugs improper gap. Improperly set, Remove center wire from distributor cap and hold within 3/8 inch worn or pitted of motor block.
  • Page 24 Vibration Mis-firing or pre- See correction under mis-firing and pre-ignition. ignition Loose foundation or foundation bolts Propeller shaft out of line or bent Propeller bent or pitch out of true Pre-Ignition Defective spark Check all spark plugs for broken porcelain, burned electrodes or plugs electrodes out of adjustment.

  • Page 25: A Final Word

    In addition, all Universal factory personnel will promptly answer inquiries regarding maintenance, installation or special adaptions. If you will use judgment and care in operating your Universal engine, use sufficient quantities of the recommended lubricants, stay on the alert for the first signs of trouble, and contact Universal whenever you...

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