377 Mag, Seacore 377 Mag; Fluid Specifications; Engine-350/377 Mag Ect And Seacore 350/377 Mag Ect; Engine-350/377 Mag And Seacore 350/377 Mag - Mercury 350 MAG Manual

377 MAG, SeaCore 377 MAG

NOTE: Performance specifications are obtained and corrected in accordance with SAE J1228/ISO 8665 Crankshaft Power.
All measurements are taken with the engine at normal operating temperature.
RPM range is measured using an accurate service tachometer with the engine at normal operating temperatures.
Oil pressure must be checked with the engine at normal operating temperature.
NOTE: Oil pressure specifications are for reference and may vary.
IMPORTANT: Do not mix spark plug types in an engine. All spark plugs should have the same part number.
Propshaft power
Displacement
Alternator amperage
RPM
Minimum oil pressure
Thermostat
Timing at idle
Firing order
Minimum battery rating
Spark plug type
Spark plug gap
Emission control system

Fluid Specifications

IMPORTANT: All capacities are approximate fluid measures.
Engine—350/377 MAG ECT and SeaCore 350/377 MAG ECT
IMPORTANT: Always use the dipstick to determine the exact quantity of oil or fluid required.
All Models
Engine oil (with filter)
Seawater cooling system (winterization
use only)
Closed cooling system
Engine—350/377 MAG and SeaCore 350/377 MAG
IMPORTANT: Always use the dipstick to determine the exact quantity of oil or fluid required.
90-8M0050539 MAY 2011
eng
Hot
Cold
WOT
Rev limiter
Idle in neutral
At 2000 RPM
At idle
Seawater‑cooled models
MPI models with closed cooling
Non‑DTS models
DTS models
Capacity
4.25 L (4.50 US qt)
20 L (21 US qt)
18 L (19 US qt)
ethylene glycol 5/100 antifreeze mixed 50/50 with purified water
293 kW (320 hp)
124 kPa (18 psi)
1‑8‑4‑3‑6‑5‑7‑2
750 CCA, 950 MCA, 180 Ah
800 CCA, 1000 MCA, 190 Ah
AC Platinum (AC 41‑993)
AC Platinum (AC 41‑101)
1.5 mm (0.060 in.)
Electronic engine control (EC)
Fluid Type
Mercury Full‑Synthetic MerCruiser Engine Oil 20W‑40
Propylene glycol and purified water
Mercury Extended Life Coolant Antifreeze or extended life
Section 4 - Specifications
6.2 L (377 cid)
72 A
65 A
4800–5200
5350
550
41 kPa (6 psi)
71° C (160° F)
77° C (170° F)
Not Adjustable
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