Mercury 250 Service & Repair Manual

1 A IMPORTANT INFORMATION SPECIFICATIONS

90-822900R3 DECEMBER 1997 1A-0 - IMPORTANT INFORMATION Table of Contents Page Master Specifications 1A-1 . . . . . . . . . . . . . . . . . . . . . . . .

90-822900R3 DECEMBER 1997 IMPORTANT INFORMATION - 1A-1 Master Specifications Model 3 Litre Work/225 Carb/225 EFI/250EFI HORSEPOWER (KW) Model 3 Litre Model 225 Carb Model 225 EFI Model 250 EFI 225 (167.8) 225 (167.8) 225 (167.8) 250 (186.5) OUTBOARD WEIGHT 3 Litre/225 Carb – 20 in. (50.8cm) Shaft – 25 in. (63.5cm) Shaft – 30 in. (76.2cm) Shaft 225 EFI/250 EFI – 20 in. (50.8cm) Shaft – 25 in. (63.5cm) Shaft – 30 in. (76.2cm) Shaft 440.0 lbs. (199.8kg) 445.0 lbs. (202.0kg) 461.0 lbs. (209.3kg) 450.0 lbs. (204.1kg) 455.0 lbs. (206.4kg) 471.0 lbs. (213.6kg) CYLINDER BLOCK Type Displacement V–6 Cylinder, Two Cycle, Loop Charged 185.9 cu. in. (3047cc) STROKE Length (All Models) 3.00 in. (76.2mm) CYLINDER BORE Diameter (Std) Taper/Out of Round/Wear Maximum Bore Type 3.6265 in. (92.1131mm) 0.003 in. (0.076mm) Cast Iron PISTON Piston Type Standard Aluminum 3.621 in. ± .0005 in. (91.973mm ± 0.0127mm) COMPRESSION All Models – Using a fully charged battery, throttle shutters wide open and cylinder block warm 90 – 110 psi (616.3 – 753.5 kPa) Variance between cylinders should not exceed 15 psi (102.7 kPa) REEDS Reed Stand 0pen (Max.) 0.020 in. (0.50mm) MID SECTION Power Trim (Total Tilt Range) Power Trim (Tilt Range) Steering Pivot Range Tilt Pin Adjustment Positions Allowable Transom Thickness 75° 20° 60° 5 2-3/8 in. (6.03cm) Maximum

90-822900R3 DECEMBER 1997 1A-2 - IMPORTANT INFORMATION Model 3 Litre Work/225 Carb/225 EFI/250EFI GEAR HOUSING Gear Ratio 1994 Standard Ratio All Models 1995/1996 Gear Ratios All Models Optional High Altitude Ratio (Right Hand Rotation) 3 Litre Work (All Shaft Lengths) 225 Carb (20 in. Shaft Length) 225 Carb (25 in./30 in. Length) 225 EFI (All Shaft Lengths) 250 EFI (All Shaft Lengths) Gearcase Capacity Pinion Height Forward Gear Backlash – 1.75:1/1.87:1 Reverse Gear Backlash – Standard Rotation – Counter Rotation Water Pressure @ RPM – @ Idle – @ 5000 RPM 1.64:1 17/28 Teeth Service Replacement Ratio for 1.64:1 is 1.62:1 13/21 Teeth 1.87:1 15/28 Teeth 1.75:1 12/21 Teeth 1.75:1 1.75:1 1.75:1 1.75:1 28.0 fl. oz. (828.0ml) 0.025 in. (0.64mm) . 0.017 in. – 0.028 in. (0.43mm – 0.71mm) 0.028 in. to 0.052 in. (0.71mm to 1.32mm) 0.040 in. – 0.060 in. (1.0mm – 1.52mm) 1-1/2 – 4-1/2 psi (10.3 – 30.8kPa) 8 – 10 psi (54.8 – 68.5kPa) Minimum FUEL SYSTEM Fuel Recommended Gasoline Recommended Oil Gasoline/Oil Ratio Fuel Pressure – @ Idle – @ WOT Gasoline w/Oil Injection Unleaded 87 Octane Minimum Quicksilver TC-W3 2 Cycle Outboard Oil 50:1 2 psi (13.7kPa) 8 psi (54.8kPa) STARTING SYSTEM Manual Start – All Models Electric Start – All Models Starter Draw (Under Load) Starter Load (No Load) Minimum Brush Length Battery Rating Emergency Start Rope 165 Amperes 25 Amperes 0.25 in. (65.4mm) 630 Marine Cranking Amps (MCA) or 490 Cold Cranking Amps (CCA) IGNITION SYSTEM Type Spark Plug Type 1994 – 1996 S/N 0D280813 - 0G437999 3 Litre Work/225 Carb 1997 S/N 0G438000 and UP 3 Litre Work/225 Carb 1994/95/96/97 225 EFI/250EFI Spark Plug Gap NGK BPZ8H-N-10 Champion QL77CC Capacitor Discharge NGK BPZ8H-N-10 Champion QL77CC Champion QL77CC 0.040 in. (1.0mm) 0.035 in. (0.89mm) CHARGING SYSTEM Alternator Output (Regulated) Brush Length 30 Amperes @ 750 RPM 60 Amperes @ 2000 RPM Std. Exposed Length: 0.413 in. (10.5mm) Min. Exposed Length: 0.059 in. (1.5mm)

90-822900R3 DECEMBER 1997 IMPORTANT INFORMATION - 1A-3 Model 3 Litre Work/225 Carb/225 EFI/250EFI F U E L I N J E C T I O N Idle RPM – Model 225 EFI/250 EFI Wide Open Throttle (WOT) RPM – Model 225 EFI – Model 250 EFI Float Adjustment (Vapor Separator) Float Level Injectors – All Models (Quantity) – Fuel ECU Receives Signal from: – #2 Primary Ignition Circuit – #4 Primary Ignition Circuit – #6 Primary Ignition Circuit Line Pressure @ Injectors 650 ± 50 5000 – 5800 5000 – 5800 Preset @ Factory 6 #1 and #2 Injectors (WHITE Lead) #3 and #4 Injectors (DARK BLUE Lead) #5 and #6 Injectors (YELLOW Lead) 34 psi – 36 psi (234kPa – 248kPa) OIL INJECTION Recommended Oil Oil Tank Capacity (in boat) Approx. Time – Model 225/250 Reserve Capacity/Approx. Time Output @ 1500 RPM for 3 Minutes with Pump @ Full Open Quicksilver TC-W3 3 gal. (11.4Liter) 6.0 hrs. Approx. 1.5 qt. (1.45 Liter) 30 – 35 min. 31.5cc @ 1500 RPM

90-822900R3 DECEMBER 1997 1A-4 - IMPORTANT INFORMATION Model 3 Litre Work/225 Carb/225 EFI/250EFI C A R B U R E T O R Model 3 Litre Work Idle RPM Wide Open Throttle (WOT) RPM Idle Mixture Screw Adjustment Float Adjustment WMV 6 – Cylinder #1 – Main Jet – Idle Jet – Vent Jet – Cylinder #2 – Main Jet – Idle Jet – Vent Jet – Cylinder #3 – Main Jet – Idle Jet – Vent Jet – Cylinder #4 – Main Jet – Idle Jet – Vent Jet – Cylinder #5 – Main Jet – Idle Jet – Vent Jet – Cylinder #6 – Main Jet – Idle Jet – Vent Jet 650 ± 50 5000 – 5500 1-1/2±1/4 Float is Level with top of Bowl w/Bowl In- verted .078 .042 .080 .078 .042 .080 .080 .056 .080 .078 .018 .080 .088 .056 .080 .078 .018 .080

90-822900R3 DECEMBER 1997 IMPORTANT INFORMATION - 1A-5 Model 3 Litre Work/225 Carb/225 EFI/250EFI C A R B U R E T O R Model 3 Litre Work Idle RPM Wide Open Throttle (WOT) RPM Idle Mixture Screw Adjustment Float Adjustment WMV 11 – Cylinder #1 – Main Jet – Idle Jet – Vent Jet – Cylinder #2 – Main Jet – Idle Jet – Vent Jet – Cylinder #3 – Main Jet – Idle Jet – Vent Jet – Cylinder #4 – Main Jet – Idle Jet – Vent Jet – Cylinder #5 – Main Jet – Idle Jet – Vent Jet – Cylinder #6 – Main Jet – Idle Jet – Vent Jet 650 ± 50 5000 – 5500 1-1/2±1/4 Float is Level with top of Bowl w/Bowl In- verted .082 .040 .080 .082 .046 .080 .082 .058 .080 .086 .048 .080 .082 .054 .080 .082 .048 .080

90-822900R3 DECEMBER 1997 1A-6 - IMPORTANT INFORMATION Model 3 Litre Work/225 Carb/225 EFI/250EFI C A R B U R E T O R Model 225 Idle RPM Wide Open Throttle (WOT) RPM Idle Mixture Screw Adjustment Float Adjustment WMV 7 – Cylinder #1 – Main Jet – Idle Jet – Vent Jet – Cylinder #2 – Main Jet – Idle Jet – Vent Jet – Cylinder #3 – Main Jet – Idle Jet – Vent Jet – Cylinder #4 – Main Jet – Idle Jet – Vent Jet – Cylinder #5 – Main Jet – Idle Jet – Vent Jet – Cylinder #6 – Main Jet – Idle Jet – Vent Jet 650 ± 50 5000 – 5500 1-1/2±1/4 Float is Level with top of Bowl w/Bowl In- verted .086 .038 .080 .086 .038 .080 .088 .070 .080 .088 .020 .080 .088 .070 .080 .088 .032 .080

90-822900R3 DECEMBER 1997 IMPORTANT INFORMATION - 1A-7 Model 3 Litre Work/225 Carb/225 EFI/250EFI C A R B U R E T O R Model 225 Idle RPM Wide Open Throttle (WOT) RPM Idle Mixture Screw Adjustment Float Adjustment WMV 13 – Cylinder #1 – Main Jet – Idle Jet – Vent Jet – Cylinder #2 – Main Jet – Idle Jet – Vent Jet – Cylinder #3 – Main Jet – Idle Jet – Vent Jet – Cylinder #4 – Main Jet – Idle Jet – Vent Jet – Cylinder #5 – Main Jet – Idle Jet – Vent Jet – Cylinder #6 – Main Jet – Idle Jet – Vent Jet 650 ± 50 5000 – 5500 1-1/2±1/4 Float is Level with top of Bowl w/Bowl In- verted .084 .046 .082 .082 .060 .082 .084 .054 .086 .086 .052 .086 .084 .058 .082 .082 .052 .082 T I M I N G Idle Timing Maximum BTDC @ W.O.T (5000 RPM or Above) MODEL 3 LITRE WORK/225 CARB MODEL 225 EFI MODEL 250 EFI 4° – 8° ATDC 19° BTDC @ 5000 RPM 24° BTDC @ 5500 RPM 24° BTDC @ 5000 RPM 24° BTDC @ 5800 RPM 24° BTDC @ 5000 RPM 28° BTDC @ 5800 RPM NOTE: Timing specifications listed are for 1998 model year engines. Refer to timing decal on engine for previous model year timing specifications.

Mercury 250 Service & Repair Manual

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