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1. 2007 Dyna Spa Manual User Guide
2. 2007 Dyna Spa Manual User Guide

AUTO PDF TO TEXT EDITOR: HOME ENGINE OIL FLOW OIL FEED The oiling system is carefully designed for optimum effi- ciency. All oil holes and passageways are specially sized. Exercise caution to avoid enlarging oil holes during cleaning. Any modification of the oiling system will adversely affect oil pressure or cooling and lubrication efficiency. See Figure 3-1. Oil flows from the oil pan (1) through a pas- sageway at the front of the transmission housing (2). 2 See Figure 3-2.

Running through a passageway in the crank- case (1), oil exits a hole in the crankcase flange and enters a hole on the inboard side of the cam support plate (2). Passing through a channel in the cam support plate, the oil enters the feed side of the oil pump (3). See 3.5 OIL PUMP OPERA- 1 TION. The feed gerotors of the pump direct the flow up a sec- ond channel in the cam support plate.

A passage (5) connects to a pressure relief valve (6) mounted in the bypass port of the cam support plate. When the oil 1. Pickup from oil pan pressure exceeds the setting of the valve spring (35 PSI), the 2. Feed channel to engine orifice opens to bypass (7) excess oil back to the feed side of the pump (3). Oil Flow From Pan 1. Crankcase passage 2.

Cam support plate/crankcase connection 3. Feed side of oil pump 4. Oil pump output 5. Overflow passage 6.

Pressure relief valve 7. Bypass passage 8. Oil pressure sending unit 9.

Return from oil filter into cam support plate Figure 3-2. Cam Support Plate Oil Flow.

AUTOMATED PDF TO TEXT EDITOR: 3-16 2007 Dyna: Engine HOME OIL PRESSURE OIL PRESSURE INDICATOR LAMP See Figure 3-13. The red OIL PRESSURE indicator lamp illu- minates to indicate improper circulation of the engine oil. The lamp illuminates when the ignition is first turned on (before the engine is started), but should be extinguished once the engine is running. CAUTION If the oil pressure indicator lamp remains lit, always Figure 3-13. Oil Pressure Indicator Lamp check the oil supply first. If the oil supply is normal and the lamp is still lit, stop the engine at once and do not ride further until the trouble is located and the necessary repairs are made. Failure to do so may result in engine damage.

(00157a) If the indicator lamp is not extinguished, it may be the result of a low oil level or diluted oil supply. In freezing weather, the oil feed and return lines can clog with ice or sludge. A problem in the lamp wiring, faulty oil pressure sending unit, damaged oil pump, plugged oil filter element, incorrect oil viscosity, broken or weak spring in the oil pressure relief valve and/or damaged or incorrectly installed O-rings in the engine may also cause the indicator lamp to remain on. To troubleshoot the problem, always check the engine oil level first. If the oil level is OK, determine if oil returns to the pan from the oil return hose.

If oil does not return, shut off the engine until the problem is located and corrected. 2007 Dyna: Engine 3-15 HOME BREATHER OPERATION 3.6 GENERAL d0440x3x NOTE The crankcase breather system relieves crankcase pressure produced by the downstroke of the pistons and allows crank- case vapors vacated from each cylinder to be directed into 3 the air filter element. Through effective recirculation of crank- 2 case vapors, the system serves to eliminate the pollutants normally discharged from the crankcase. See Figure 3-12. As each piston pushes downward on its power and intake stroke, displaced air in the flywheel com- partment is vented through the crankshaft roller bearing into the cam compartment and then up the push rod covers (1) into the rocker housing. Air rushes under the rocker arm support plate, which is ele- vated slightly, and passes through an opening at the bottom of the plate to enter the breather baffle compartment (2). In the baffle compartment, the flow of air passes upward through the oil filter gauze, where the oil is removed from the air.

Two pin holes in the rocker arm support plate act as drain 4 holes to rid the baffle compartment of the oil separated from the air. Passing through the oil filter gauze, the flow of air passes through the umbrella valve (3) into the breather compartment. 1 The flaps of the umbrella valve only allow air to be vented one 5 way, rising to allow the passage of air, but then falling back 1.

2007 Dyna Spa Manual User Guide

Push rod cover into place to seal the vent holes as the flow of air stops. Breather baffle In the breather compartment, the flow of air reverses direction 3. Umbrella valve passing downward through holes aligned in the breather baf- 4. Air cleaner backplate bolt fle, rocker arm support plate and rocker housing.

2007 Dyna Spa Manual User Guide

Exiting the 5. Breather tube rocker housing, the air enters a passageway cast into the top of the cylinder head. Proper orientation of the rocker housing Figure 3-12. Breather Air Flow gasket is critical for effective sealing of this passageway. Flowing through the cylinder head passageway, the air passes through a drilling in the air cleaner backplate bolt (4) and then through a breather tube (5) into the air filter element. NOTE Air cleaner mounting without installation of the breather tubes allows crankcase vapors to be vented into the atmosphere in violation of legal emissions standards.