Mercury 60 Bigfoot 4 stroke Specs
| Engine Model: Mercury Bigfoot 60 |
| Engine Type: 4-stroke inline 4-cylinder SOHC gasoline outboard engine |
| Total Displacement: 60.8 cu.in (995 cc) |
| Rated Engine Power: 60 Hp (44.1 kW) at 6000 rpm |
| Fuel System: Electronic fuel fnjection (EFI) |
____________________________________________________________________________________
The Mercury Bigfoot 60 represents a purposeful
adaptation of the standard 60hp four-stroke powerhead, engineered
specifically to deliver superior thrust and durability for heavier
vessel applications. Its defining characteristic is the heavy-duty
gearcase with a 2.33:1 gear ratio, which allows the engine to turn a
larger diameter propeller for enhanced grip and efficiency when pushing
heavy loads.
The powerhead is a smooth and refined inline four-cylinder four-stroke
featuring Electronic Fuel Injection (EFI) for effortless starting and
optimized performance in all conditions. The SOHC design incorporates a
non-interference valvetrain where valves will not contact pistons should
the camshaft timing belt break, enhancing durability and serviceability.
The engine is fully compatible with SmartCraft digital technology,
providing operators with critical data including fuel flow and range
calculations. With four-cylinder architecture delivering superior
smoothness compared to three-cylinder competitors, the Bigfoot 60
provides a more pleasant operating experience across the entire RPM
range.
Maximum Power Output: 60 Hp (44.1 kW) at the propeller shaft.
Full Throttle Operating Range: 5500 to 6000 RPM.
Engine Type: Inline 4-cylinder, four-stroke with Single Overhead
Camshaft (SOHC).
Displacement: 995 cc (60.8 cubic inches).
Bore and Stroke: 65 mm (2.56 inches) bore and 75 mm (2.95 inches)
stroke.
Compression Ratio: 9.7:1.
Firing Order: 1-3-4-2.
Fuel System: Electronic Fuel Injection (EFI) with batch fuel injectors
operating at 42-44 psi at wide-open throttle.
Fuel Pump: Mechanical diaphragm or plunger type.
Ignition System: ECM 07 Digital Inductive, capacitor discharge type.
Alternator Output: 18 A (226 W) on most models, with some versions
offering 20-amp output.
Starting System: Electric start (turn-key) with Smart Start protection.
Steering: Compatible with Big Tiller, remote, or tiller kit
configurations.
Engine Management: SmartCraft Engine Guardian operator warning system
with compatibility for SmartCraft digital technology. Compatible Fuel:
Unleaded gasoline with minimum 87 octane (90 RON minimum).
Recommended Oil: Mercury FourStroke 25W-40 Marine Oil or Quicksilver
4-cycle marine oil. CARB Star Rating: 3-star ultra-low emissions.
The foundation of the Mercury Bigfoot 60 is a robust inline
four-cylinder block engineered for smooth operation, durability, and
efficient power delivery. Configuration: Inline 4-cylinder with overhead
camshaft design. Displacement: 995 cc (60.8 cubic inches).
Bore and Stroke: 65 mm (2.56 inches) bore and 75 mm (2.95 inches)
stroke. Cylinder Bore Type: Cast iron cylinder liners for enhanced
durability and wear resistance. Engine Type: Four-stroke, providing
clean operation, exceptional fuel efficiency, and quiet running without
the need for pre-mixing fuel and oil.
Cylinder Compression: 180-210 psi (1242-1450 kPa) in a well-maintained
engine.
Cylinder Bore Inside Diameter (Standard): 65.00 mm (2.559 inches).
Cylinder Bore Maximum Out of Round: 0.076 mm (0.003 inches).
Cylinder Bore Maximum Taper: 0.076 mm (0.003 inches).
Piston Type: Aluminum alloy pistons.
Piston Outside Diameter (Standard): 64.950-64.965 mm (2.5570-2.5578
inches).
Piston to Cylinder Clearance: 0.035-0.065 mm (0.0014-0.0026 inches).
Piston Pin Diameter: 15.965-15.970 mm (0.6285-0.6287 inches).
Crankshaft Main Bearing Clearance: 0.012-0.044 mm (0.0005-0.0017
inches).
Crankshaft Maximum Runout: 0.046 mm (0.0018 inches).
Connecting Rod Big End Oil Clearance: 0.020-0.052 mm (0.0008-0.0020
inches).
The cylinder head assembly is designed for efficient gas exchange,
durability, and simplified maintenance with its SOHC configuration.
Cylinder Head Material: Precision-cast aluminum alloy. Valvetrain
Design: Single Overhead Camshaft (SOHC) with two valves per cylinder and
maintenance-free valve train operation.
Valves per Cylinder: Two, resulting in a total of eight valves for the
engine. Non-Interference Design: The SOHC powerhead is a
non-interference type where valves will not contact piston crowns should
the camshaft timing belt break.
Valve Clearance (Intake): 0.15-0.25 mm (0.006-0.010 inches).
Valve Clearance (Exhaust): 0.25-0.35 mm (0.010-0.014 inches).
Cylinder Head Warp Limit: 0.10 mm (0.004 inches) maximum.
Valve Head Diameter (Intake): 31.9-32.1 mm (1.256-1.264 inches).
Valve Head Diameter (Exhaust): 25.9-26.1 mm (1.020-1.028 inches).
Valve Face Width: 2.00-3.14 mm (0.079-0.124 inches).
Valve Seat Width: 0.9-1.1 mm (0.035-0.043 inches).
Valve Stem Diameter (Intake): 5.475-5.490 mm (0.2156-0.2161 inches).
Valve Stem Diameter (Exhaust): 5.460-5.475 mm (0.2150-0.2156 inches).
Valve Guide Inside Diameter: 5.500-5.512 mm (0.2165-0.2170 inches).
Camshaft Bore Inside Diameter: 37.000-37.025 mm (1.4567-1.4577 inches).
The fuel system utilizes advanced electronic controls to provide
enhanced reliability and precise fuel delivery for optimal performance.
Induction System: Electronic Fuel Injection (EFI) with batch fuel
injectors, providing precise fuel metering for effortless starting and
superior fuel efficiency.
Fuel Injectors: Automotive-type injectors operating at approximately 42
psi (2.9 bar), ensuring the injection system operates in an
understressed condition for enhanced durability.
Fuel Pressure at Idle: 21-42 kPa (3-6 psi).
Fuel Pressure at Wide-Open Throttle: 290-303 kPa (42-44 psi).
Fuel Pump Type: Mechanical diaphragm or plunger type.
Recommended Fuel: Unleaded gasoline with minimum 87 octane.
The four-stroke design incorporates a self-contained, high-pressure
wet-sump lubrication system ensuring all moving parts are properly oiled
for long-term durability. System Type: Wet sump with trochoid oil pump.
Oil Pump Type: Trochoid pump providing positive displacement
lubrication. Oil Capacity: 3.0 liters (3.15 quarts). Engine Oil
Pressure: 207-278 kPa (30-40 psi) at operating temperature.
Recommended Oil: Mercury FourStroke 25W-40 Marine Oil or Quicksilver
4-cycle marine oil meeting API service classifications SH, SG, SF, CF-4,
CE, CD. Oil Filter: Canister-type oil filter easily accessible for
routine changes. Oil Change System: No-spill oil change system for
cleaner maintenance.
To manage engine temperature under varying loads and conditions, the
Mercury Bigfoot 60 uses a positive displacement water pump for raw water
cooling. System Type: Water-cooled with thermostat, drawing outside
water through an intake in the gearcase.
Core Components: Rubber-impeller water pump driven by the driveshaft,
with thermostat regulating flow to maintain optimal operating
temperature. Water Pressure at 6000 RPM: 83-172 kPa (12-25 psi).
Flushing System: Quick-connect flush attachment for easy cooling system
maintenance after saltwater operation.
| Mid Section and Lower Unit |
The mid-section houses the exhaust and driveshaft, while the lower unit
is the defining feature of the Bigfoot model, engineered for high-thrust
applications. Gearcase Design: Heavy-duty Bigfoot/Command Thrust
gearcase with larger, more robust components designed for high-load
applications.
The gearcase is engineered to accommodate a larger diameter propeller
(14-inch) for enhanced thrust and efficiency. Gear Ratio: 2.33:1,
significantly deeper than the standard 1.83:1 ratio, converting engine
torque to thrust more efficiently.
Number of Teeth (Forward Gear): 30 teeth.
Number of Teeth (Pinion Gear): 13 teeth.
Pinion Height: 0.64 mm (0.025 inches).
Forward Gear Backlash: 0.30-0.48 mm (0.012-0.019 inches).
Gear Shift: Standard forward-neutral-reverse (F-N-R) shifting operation.
Exhaust System: Through-propeller exhaust for quieter operation and
reduced back pressure.
Gearcase Lubrication: Holds dedicated high-grade marine gear lubricant,
0.71 L (0.75 qts).
Gearcase Lubricant Type: Quicksilver gear lube premium blend.
Transom Height (Long Shaft): 510 mm (20 inches).
Full Tilt Up Angle: 71 deg.
Steering Pivot Range (Tiller): 90 deg.
Steering Pivot Range (Remote): 60 deg.
Allowable Maximum Transom Thickness: 69.8 mm (2.75 inches).
The engine is equipped with an integrated electro-hydraulic system for
adjusting the engine's angle relative to the transom.
System Type: Power Trim, electro-hydraulic, controlled by
dashboard-mounted switches.
Trim Function: Allows operator to adjust engine angle while underway to
optimize boat attitude and improve fuel efficiency.
Shallow Water Trim Range: 20 deg, allowing operation in very shallow
water.
Tilt Function: Lifts engine out of water for trailering, launching,
beaching, or storage.
Tilt Pin Adjustment Positions: 5 positions plus shallow water setting.
Propeller Design: The Bigfoot gearcase is specifically engineered to
turn a larger diameter propeller, with documented use of 14-inch
diameter propellers for enhanced thrust.
Standard Propeller: Three-blade aluminum propeller supplied as standard
equipment. Propeller Pitch Options: Available in a range of pitches from
9 to 23 inches to accommodate various applications and performance
requirements. Documented options include 9, 10, 11, 13, 15, 16, 17, 19,
21, and 23-inch pitches.
Propeller Rotation: Right-hand rotation (clockwise when viewed from
behind). Propeller Material Options: Aluminum standard, with stainless
steel options available for enhanced durability and performance.
Long shaft: 508 mm (20 inches) for standard transom heights.
Extra-long shaft: 635 mm (25 inches) for higher transoms.
Dry Weight: The lightest model available weighs approximately 112 kg
(247 lbs). Some configurations and sources list weights of 119.8 kg (264
lbs) depending on specific model and features. The Bigfoot model is 35
percent lighter than the Mercury 75hp four-stroke.
First 20 Hours or 3 Months:
Inspect and lubricate all moving parts and pivot points.
Check engine oil level and condition.
Inspect gearcase lubricant for water intrusion.
Check and tighten all accessible hardware.
Every 100 Hours or Annually (Whichever
Occurs First):
Lubricate all lubrication points.
Change engine oil and replace oil filter.
Inspect and clean or replace spark plugs.
Spark plug type: Champion RA8HC with 1.0 mm (0.040 inch) gap.
Check engine fuel filter for contaminants.
Check corrosion control anodes, replacing if more than 50 percent
eroded.
Drain and replace gearcase lubricant.
Lubricate splines on the drive shaft.
Inspect battery condition.
Check power trim fluid level.
Check and adjust valve clearance as necessary.
Check engine timing setup.
Check control cable adjustments.
Inspect timing belt. The timing belt is designed to last approximately
1000 hours.
Replace water pump impeller.
Ignition Timing Specifications:
At 1800 RPM: 14 deg BTDC.
At 6000 RPM: 28 deg BTDC.
Spark Plugs: Torque to manufacturer specifications.
Propeller Nut: 40 Nm (30 lb-ft) as standard for Mercury outboards.
Gearcase Mounting Nuts: 40 Nm (30 lb-ft).
Engine Mounting Bolts (to transom): 55-60 Nm (41-44 lb-ft) with marine
sealer applied to bolt shanks.
Pinion Height: Set to 0.64 mm (0.025 inches) during gearcase assembly.
Forward Gear Backlash: Adjust to 0.30-0.48 mm (0.012-0.019 inches).
Pontoon Boats: The Bigfoot 60 is specifically engineered for pontoon
applications, providing the necessary thrust to efficiently propel these
heavier vessels through turbulent water created by twin hulls. Heavy
Aluminum Fishing Boats: Suitable for larger tinnies and aluminum fishing
boats up to 5.5 meters (18 feet), filling the gap between standard 60hp
models and the heavier 75hp outboards.
Workboats and Commercial Applications: The robust gearcase and enhanced
torque make it suitable for light commercial use in workboats, rental
fleets, and utility applications requiring durability and reliable
thrust. Barge and Utility Craft: The high-thrust characteristics suit it
for small barges and utility vessels operating in inland waters.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
