SPECIFICATIONS
28
Engine Operating Limitations (HP700)
Maximum wide open throttle (W.O.T.) RPM 4800 ‑ 5300 RPM
Rev limit
1.
5400 RPM
Idle RPM in gear 700 RPM
Idle RPM out of gear 750 RPM
Maximum fuel system flow rate 256 L/hr (68 gals/hr) at 5200 RPM
Fuel pressure at idle 4071 ‑ 421 kPa (59 ‑ 61 psi)
Fuel pressure at W.O.T. 462 ‑ 483 kPa (68 ‑ 72 psi)
Coolant thermostat is fully open at
temperature
70° C (158° F)
Minimum water pressure supplied to the
engine
207 kPa (30 psi) at 5200 RPM
Maximum water pressure supplied to the
engine
290 kPa (42 psi) at 5200 RPM
Minimum oil pressure @ idle (Hot) 100 kPa (14.5 psi)
Minimum oil pressure at 5200 RPM (Hot) 379 ‑ 448 kPa (55 ‑ 65 psi)
Maximum oil temperature at 5200 RPM
(Hot)
88° C (190° F)
Fuel Requirements
Use a major brand of unleaded gasoline, preferably without
alcohol. Mercury Marine recommends fuels that contain fuel
injector cleaner for added internal cleanliness.
!
WARNING
Fuel leakage is a fire or explosion hazard, which can cause
serious injury or death. Periodically inspect all fuel system
components for leaks, softening, hardening, swelling, or
corrosion, particularly after storage. Any sign of leakage or
deterioration requires replacement before further engine
operation.
1. Engines are equipped with an ignition system that has a built‑in 5400 RPM
rev limiter. Engine is performing normally if it will not exceed this RPM.
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