CARBURETOR 74 CHAPTER FOUR

Size: px

Start display at page:

Download "CARBURETOR 74 CHAPTER FOUR"

Louise Simmons
5 years ago
Views:

7 CHAPTER FOUR 7. Slowly rotate the distributor body clockwise or counterclockwise as required until the marks come into alignment. See Figure 1.

1 7 CHAPTER FOUR 7. Slowly rotate the distributor body clockwise or counterclockwise as required until the marks come into alignment. See Figure 1.. Tighten the hold-down bolt without further moving the distributor. Recheck timing with the timing light. Repeat Step 6 and Step 7 if timing was disturbed while tightening the bolt. 9. After the initial timing has been set, check the operation of the centrifugal advance mechanism. With the engine operating at slow idle, note the position of the timing marks with the timing light. NOTE If timing mark moves with jerky motion or does not start to move within 0-0 rpm of the specified speed in Step, the distributor centrifugal advance is not working properly and must be cleaned or repaired.. Gradually increase the engine speed to about 1,00 rpm while observing the timing marks. The moving mark should move steadily in a direction opposite of engiine rotation. 11. Decrease engine speed to slow idle while observing timing marks. The moving mark should move back smoothly as speed decreases. CARBURETOR Idle Speed and Mixture Adjustment Refer to specifications in Table 6 for the proper idle speed for your engine. Do not remove the flame arrestor for this procedure. 1. Connect a tachometer according to manufacturer's instructions. 2. Locate the idle mixture screw(s) on your carburetor. This is usually a spring-loaded screw near the carburetor base. See Figure 2 (typical). 3. Locate the idle speed screw on the carburetor throttle linkage. See Figure 3 (typical).. Start the engine and run at fast idle until normal operating temperature is reached.. Once the engine is warmed up, bring it back to a normal idle. Shift the engine into FORWARD gear and note the idle speed on the tachometer. If necessary, adjust the idle speed screw to bring the idle speed within specifications (Table 6).

2 LUBRICATION, MAINTENANCE AND TUNE-UP 7 6. Adjust the idle mixture screw to obtain the highest rpm possible. If carburetor has 2 mixture screws, adjust them alternately until the highest rpm reading is obtained. 7. Readjust idle speed to bring it back within specifications, if necessary.. Repeat Step 6 and Step 7 as required until smoothest engine operation is obtained at the specified idle speed. 9. Shut engine off and remove tachometer. Tables are on the following pages.

3 76 CHAPTER FOUR Daily Every 2 hours Every 0 hours Every 0 hours Once a season Daily Every 20 hours Every 2 hours Every 0 hours Every 6 months Table 1 OMC LUBRICATION AND MAINTENANCE SCHEDULE ENGINE Check oil level Check fuel pump overflow line for leakage Check fuel system for leakage Check fuel supply Inspect all electrical connections Check flame arrestor for damage Check cooling system for leaks Check control linkage operation Check batter^r Inspect all electrical connections Check and clean flame arrestor Check and adjust alternator drive belt tension Lubricate control linkage Change engine oil and filter Check and adjust power steering belt tension Check ignition system connections and insulation Clean and check PCV valve ^ Adjust breaker points Set ignition timing Check distribututor cap, rotor and wires Replace PCV valve ^ Replace spark plugs Adjust power steering drive belt Replace fuel filter Check and adjust carburetor idle speed and mixture Check cooling system and hose condition ^ Check for loose, missing or damaged components STERN DRIVE Check lower gearcase for smooth shifting in all gears Lubricate tilt bearings Have nominal neutral adjustment checked by a dealer Have steering cable tension adjusted by a dealer Drain and refill upper gearcase Drain and refill lower gearcase Drain and refill intermediate housing Drain and refill tilt unit gearcase Lubricate tilt gear Lubricate swivel bearing Lubricate steering shaft Lubricate power steering actuator valve and hydraulic cylinder end, if so equipped

4 LUBRICATION, MAINTENANCE AND TUNE-UP 77 Table 1 OMC LUBRICATION AND MAINTENANCE SCHEDULE STERN DRIVE Once a season Drain and refill intermediate housing Check propeiler for damage Lubricate SelecTrim jack screw and worm ^ Check SelecTrim hydraulic system for leakage and proper fluid level Lubricate Pre-Set trim jack screw Have lower gearcase and shift cable checked by a dealer 1. OMC 17, 190 and 23 hp only. 2. Drain after operating in freezing temperatures or during a seasonal lay-up. 3. Do not use a power-operated grease gun. Anticipated temperature range Above 32^ F (0 C) Zero F (-1 C) to 32 F (0 Below zero F (-1 C) or adverse operating conditions C) Table 2 ENGINE OIL VISCOSITY Recommended viscosity SAE * SAE 20W SAE W * Use SAE 0 (90 hp) or SAE (all others) for sustained high-speed operation. Table 3 APPROXIMATE OMC ENGINE OIL CAPACITIES Capacity* With filter Without filter Inline -cylinder 90 hp All others Inline 6-cylinder and 3./.3L V6 22 cid V6 and.0l 2-bbl. V All others.3 qt..0 qt.. qt..0 qt. 6.0 qt. 3.9 qt. 3. qt..0 qt..0 qt..0 qt. *AII capacities in this table are approximate. To assure correct oil level and prevent overfilling the engine, always use the dipstick as recommended in the text.

5 7 CHAPTER FOUR Table APPROXIMATE STERN DRIVE CAPACITIES Model Capacity In fl. oi/ Upper gearcase Capacity In fl. oz/ Lower gearcase Capacity In ffl. oz/ Intermediate housing CU series DU, NU series HU, KU, SU, TU series CU, HU, TU, XU series LU, GU, VU series NU series , 120,, 16, 170, 17, 190, 23 hp 22, 2 hp , hp 1, 200, 22, 2, 20, 20, 260 hp , hp 170, 1, 200, 2, 260 hp on 2.L, 3.0L 3.L,.0L,.7L * Capacity is oniy approximate. When refiiling a Stern drive after draining all lubricant, recheck level after a one-minute run-in period to eliminate air pockets> which may develop during filling. If necessary, top up after rechecking to bring iubricant to correct level. Lubricant Table RECOMMENDED LUBRICANTS, SEALANTS a ADHESIVES Application OMC Premium -cycle motor oil OMC HI-VIS gearcase lubricant OMC Premium Blend gearcase lubricant OMC Triple-Guard grease OMC Extreme Pressure grease crankcase, tilt unit gearcase Series 00 and 00 upper and lower gearcase, intermediate housing Alt Electric Shift upper and lower gearcase. intermediate housing. Ford hydraulic trim pump Swivel and tilt bearings, tilt gear SelecTrim jack screw and worm

LUBRICATION, MAINTENANCE AND TUNE-UP 79 Lubricant Table RECOMMENDED LUBRICANTS, SEALANTS & ADHESIVES Application OMC Needle Bearing grease OMC Rust Preventative OMC 2+ Fuel Conditioner OMC Power Tilt

6 LUBRICATION, MAINTENANCE AND TUNE-UP 79 Lubricant Table RECOMMENDED LUBRICANTS, SEALANTS & ADHESIVES Application OMC Needle Bearing grease OMC Rust Preventative OMC 2+ Fuel Conditioner OMC Power Tilt and Trim fluid Bearings Fuel tank Power steering pump, GM hydraulic trim pump OMC Black Neoprene Dip (part No ) OMC Pipe Sealant with Teflon (part No. 90) OMC Gasket Sealing compound (part No. 7201) Permatex No. 2 (part No. 9032) RTV adhesive sealant (part No ) OMC Locquic primer (part No. 3) OMC Ultra Lock (part No. 317) OMC Nut Lock (part No. 39) OMC Spline Lock (part No. 91) Scotch-Grip rubber adhesive (part No. 921) OMC Gel Seal/Gasket Remover SEALANTS AND ADHESiVES Table 6 TUNE-UP SPECIFICATIONS cyi./hp or dispiacement Sparic plugs Type (in.) Breaker points Dwell (degrees) (in.) Timing (degrees B) Idle speed (rpm) Fuel pump (psi) 196 2/ hp /1 hp V6/10 hp AC-M2K AC-6N AC-M3S /90 hp /120 hp V6/10 hp AC-M2K AC-CN AC-M3S /90 hp /120 hp V6/10 hp V/200 hp AC-M2K AC-CN AC-M3S AC-M3S /90 hp /120 hp V6/1 hp V/1 hp V/200 hp AC-M2K AC-CN AC-M3S AC-C3 AC-M3S

7 0 CHAPTER FOUR Table 6 TUNE-UP SPECIFICATIONS cyl./hp or displacement Spark plugs Type (in.) Breaker points Dwell (degrees) (in.) Timing (degrees B) Idle speed (rpm) Fuel pump (psi) 196 /0 hp /90 hp /120 hp V6/1 hp V/1 hp V/200 hp AC-R3N AC-M2K AC-CN AC-M3S AC-C3 AC-C /120 hp V6/1 hp V/2 hp AC-CN AC-M3S AC-C3S 1970 /90 hp /120 hp V6/1 hp V/2 hp AC-R3N AC-CN AC-M3S AC-CR3K /90 hp /120 hp V6/1 hp V/21 hp V/23 hp AC-R3N AC-CN AC-M3S AC-CR3K AC-CR3K /0 hp /120 hp V6/1 hp 6/16 hp V/22 hp V/2 hp AC-CN AC-CN AC-M3S /0 hp /120 hp / hp 6/16 hp V/22 hp V/2 hp AC-CN AC-CN AC-CN

LUBRICATION, MAINTENANCE AND TUNE-UP 1 Table 6 TUNE-UP SPECiFICATICNS cyl./hp or displacement Spark plugs Type (in.) Breaker points Timing Dwell (degrees (degrees) (in.

8 LUBRICATION, MAINTENANCE AND TUNE-UP 1 Table 6 TUNE-UP SPECiFICATICNS cyl./hp or displacement Spark plugs Type (in.) Breaker points Timing Dwell (degrees (degrees) (in.) B) Idle speed (rpm) Fuel pump (psi) 197 /120 hp / hp 6/16 hp V/170 hp V/190 hp V/22 hp V/2 hp AC-CN AC-CN /120 hp / hp 6/16 hp V/17 hp V/190 hp V/22 hp V/23 hp V/2 hp AC-CN AC-CN /120 hp / hp 6/16 hp V/17 hp V/190 hp V/22 hp V/23 hp /120 hp / hp V/17 hp V/190 hp V/23 hp /120 hp / hp V/1 hp V/22 hp V/20 hp 7 7 6

9 2 CHAPTER FOUR Table 6' rune-up SPECIFICATIONS cyl./hp or displacement Spark plugs Type (in.) Breaker points Dwell (degrees) (in-) Timing (degrees B) Idle speed (rpm) Fuel pump (psi) 1979 /120 hp / hp V/1 hp V6/200 hp V/2 hp V/20 hp V/260 hp «6 190 /120 hp / hp V/1 hp V/200 hp V/2 hp V/260 hp /2.L /3.0L V6/3.L V/.0L V/.7L AC-MRT AC-MRT /2.L /3.0L V6/.3L V/.0L V/.7L A 1 A Models 2. Modeis 3. Models. Lightwe 99020G and 99021G 6' 9902G and G 6' 99020G and 99021G 6 ight heads 13 B B. B. B.

66 CHAPTER FOUR. Spark Plug Removal Refer to Figure 28 for spark plug wive routing according to engine.

66 CHAPTER FOUR. Spark Plug Removal Refer to Figure 28 for spark plug wive routing according to engine. 66 CHAPTER FOUR IGNITION SYSTEM A mechanical contact breaker point ignition system is used on all engines covered in this manual. The ignition system may use a Delco-Remy, Autolite, Mallory or Prestolite