Mitsubishi S12R Service Manual

4 FUEL
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
107
Pub. No. 291Y1-40720 Revision: 5
*1: Cetane index (JIS K 2280) substitutes. When the fuel which satisfies the service limit of cetane number
is not available with some inevitable reasons, the use of cetane booster is allowed. However, this is
allowed only for the period before getting the fuel which satisfies the service limit after consulting with the
fuel supplier and the manufacturer of cetane booster, and at the customer's own risk.
The additive rate of 0.5% or less of cetane booster, and the lube oil analysis at every 125 hours are
recommended.
High concentration of additive may cause metal erosion, rubber material infiltration, increased load in
high-load operation, and acceleration of lube oil deterioration.
• Brand examples of cetane number improver
HITEC 4105K (Made by Afton Chemical)
*2: Only the emergency generator operated at an ambient temperature of 5°C [41°F] or more, a fuel of cetane
number 40 to 45 and sulfur content 0.2% or less can be used, if the below requirements are satisfied:
• Install a water heater.
• Time from startup to load input is to be 40 seconds.
• Operating the engine at no load or low load (load factor 30% or less) for a prolonged period of time is
avoided.
*3: If the sulfur content of using fuel is higher than 0.2 mass%, use the specified engine oil "5
ENGINE OIL"
(→ Page 109).
Table 4-5 Fuel Properties Table (2/2)
Item Recommended limit Service limit Remark
Coking
250°C [482°F],
24 Hrs
Carbonization 75% or
less
Carbonization 80% or
less
FED791B (U.S.A.)
230°C [446°F],
24 Hrs
Carbonization 55% or
less
-
180°C [356°F],
48 Hrs
Tar-free -
Aromatics HPLC method
38 volume% or less
(total of aromatic con-
tent)
38 volume% or less
(total of aromatic con-
tent)
JIS K 2536
ISO 3837
Polycyclic aromatic content 8 volume% or less 8 volume% or less
Asphaltene 0.1 mass% or less 0.1 mass% or less -
Particulate
foreign sub-
stance
Foreign substanc-
es at engine fuel
inlet
10 mg/L or less 10 mg/L or less
JIS B 9931
ISO 4405
Lubricity
HFRR wear test
MWSD (Measured
mean Wear Scar
Diameter)
At 60°C [140°F]
460 μm [0.02 in.] or less
(calculated wear scar di-
ameter at standard vapor
pressure 1.4 kPa {0.01
kgf/cm
2
} [0.20 psi])
- ISO 12156-1
BDF: Biodiesel fuel (FAME: Fatty
Acid Methyl Ester)
BDF quality shall meet JIS K 2390, or ASTM D6751
or EN14214.
BDF blending of 7 volume% or less is approved *4
JIS K 2390
(FAME for blended
fuel)
ASTM D6751,
EN 14214

Mitsubishi S12R Specifications

General

Brand	Mitsubishi
Model	S12R
Category	Engine
Language	English