DAVIS MODEL 99 (1927-28) DELCO-REMY GENERATING, STARTING SYSTEM DELCO-REMY IGNITION BATTERY:—Willard, Type CWR-15, 6 volt, 15 plates. The negative (—) terminal is grounded. Starting capacity (20 minute rate) is 104 amperes for 20 minutes. Lighting capacity (5 ampere rate) is 5 amperes for 20 hours. (igi) Ave (yw) IGNITION:—Coil Model 525-A. Ignition current is 2 amperes at 6 volts with engine Remap running and 5 amperes at 6 volts with engine stopped. Coil is mounted at right of engine. Distributor Model 658-G. Breaker contacts separate .022 inch. Set contact gap by loosening lockscrew on stationary contact mounting plate and turning eccentric adjusting screw until contact gap is .022 inch with breaker arm on lobe of cam. Resurface contacts with a fine flat contact file or on a medium hard oilstone. Breaker arm spring tension is 17-21 ounces. Breaker has two sets of contacts on a single four sided cam. Contacts open alternately at intervals of 45 degrees corresponding to 90 degrees of crankshaft rotation. This is the cor- rect firing interval for the Davis engine and must be accurately set. See Timing. Distributor is semi-automatic. Maximum manual advance is 33 degrees (engine). Automatic advance begins at 400 R.P.M. of engine. Maximum automatic advance is 35 degrees reached at 2400 R.P.M. UGHTING Mounting:—Distributor is mounted at forward end of generator at right of engine. switcH To remove distributor, disconnect primary lead and manual advance rod and remove distributor head with cables intact. Then loosen distributor clamp screw and lift unit from place. Oiling:—Fill the grease cup on the side of the shaft and turn down one turn every month or each 1000 miles. Once each month remove the distributor head and rotor and saturate the wick oiler in the center of the shaft with light oil. At the same time put a small bit of vaseline on the face of the breaker cam. Timing:—Synchronization of Contacts:—Use Delco-Remy tool, Part No. 820738, and follow directions on Page S-25 of National Service Manual. Contacts can be synchronized without tool after distributor has been timed to the engine. Crank engine over 90 degrees from firing position of piston No. 1 when piston No. 6 will reach top dead center entering power stroke. The second set of contacts should separate at this point. Loosen lockscrews and turn eccentric adjusting screw until contacts begin to separate. Tighten the lockscrews and connect seg- ment opposite rotor to spark plug in cylinder No. 6. Connect remaining spark plugs in order 2-5-8-3-7-4-1 clockwise around the distributor head. Timing Distributor to Engine:—Breaker contacts begin to separate when the piston entering power stroke reaches top dead center with the manual spark con- trol lever fully retarded. To set timing, crank engine until piston No. I enters compression stroke (the upstroke with both valves closed). Fully retard spark control lever. Continue to crank engine until piston reaches top dead center. Then loosen advance arm clamp screw and turn distributor housing until one set of contacts begin to separate. Tighten the clamp screw and make certain that the segment opposite the rotor is connected to the spark plug in cylinder No. 1. Firing Order:—The firing order is 1-6-2-5-8-3-7-4. Spark Plugs:—Spark plugs are 74-18 S.A.E. Standard. Gaps are .025 inch. VALVE TIMING:—INLET VALVES:—Head diameter, 134 inches; stem diameter, -3095/.3085 inch; stem length, 5 61/64 inches (top of seat to end). Valve lift, 5/16 inch; spring pressure, 87 pounds total. Tappet clearance, .004 inch (hot). _ Valves open 8 degrees past top dead center and close 40 degrees past lower lead center. . UST VALVES:—Head diamter, 134 inches; stem diameter, .0395/.3085 inch; stem length, 5 61/64 inches (top of seat to end). Valve lift, 5/16 inch; DAVIS MODEL 99 (1927-28) DELCO-REMY GENERATING, STARTING AND LIGHTING SYSTEM DELCO-REMY IGNITION i , 87 pounds total. Tappet clearance, .006 inch (hot). Valve oem cndas ane renuorabies Exhaust 4 open 40 degrees before lower dead center and close 8 degrees past top dead center. STARTER:—Model 716-B. Starter is connected to the engine through a Bendix Drive. The direction of rotation is counter-clockwise, looking at the commutator end. Starter switch is Model 406-A. Brush spring tension is 24-28 ounces. Starter Data Torque R.P.M. Volts Amperes Os be ft cco S000 Le a 70 1S eens Locks 22s Fee chy, “Gas Cah ce ae 450 Mounting:—Starter is flange mounted at left of engine on forward side of flywheel housing. To remove starter, disconnect cable and remove 3 flange mounting cap- screws. Then slide starter forward and lift from place. Oiling:—Put 8 to 10 drops of light oil in the commutator end oiler every month or each 1000 miles. The drive end bearing is oilless. GENERATOR:—Model 944-D. The direction of rotation is counter-clockwise, pier ach at the commutator end. Generator current regulation is by third brush shunt fel and thermostat. Thermostat contacts open at 165°F. cutting the