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Mitsubishi SIiI2R Engine

Name: Mitsubishi SIiI2R Engine
Brand: Mitsubishi

The Mitsubishi SIiI2R is an engine, producing up to 1350 kW. It powers generator sets from Mitsubishi.

Also known as: MITSUBISHI SIiI2R

1350 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ

Engine specifications

Gross power	1350 kW

Generator sets powered by this engine

Mitsubishi SIiI2R

How to read your Mitsubishi engine serial & model number →

Troubleshooting

Symptoms & remedies

Symptom	Cause	Remedy
Starter will not crank engine or cranks slowly, resulting in a failure of engine to start		Repair or replace. Battery — starter switch circuit open
Starter will crank engine, but engine will not start		Refuel. Consult Mitsubishi dealer.
Engine lacks power	Incorrect grade of oil, Wrong type of fuel, Insufficient air (air cleaner clogged), Engine overcooled, Fuel feed pump gauze filter clogged
Engine overheating	Valve clearance incorrect, Injection pump defective, Injection nozzles defective, Injection timing incorrect, Compression pressure low (cylinders and pistons worn)
White or blue exhaust smoke	Too much oil in crankcase, Oil viscosity too low	Use radiator cover, or clean, test and replace thermostat. Fill only to correct level on gauge. Refill with correct viscosity of oil.
Engine overcooled	Thermostat defective (no water temperature rise)	Use radiator cover, or clean, test and replace thermostat.
Injection timing incorrect, Compression pressure low		Readjust. Disassemble and replace parts. Change.
Black or gray exhaust smoke	Wrong type of fuel (low cetane number), Vaive clearance incorrect, Injection pump defective, Compression pressure low, Insufficient air (air cleaner clogged)	Refill with correct type of fuel. Readjust. Readjust or replace. Disassemble and replace parts. Clean or change element.
High fuel consumption		Readjust or replace. Disassemble and replace parts. Change. Refill with correct type of fuel. Disassemble and replace parts. Clean or change air cleaner element. Check turbocharger.
High oil consumption	Too high oil level in crankcase, Incorrect grade of oil, Oil leaks, Cylinders and piston rings worn	Maintain oil level in correct range on gauge. Use recommended type and SAE number of oil. Retighten or replace. Disassemble and replace parts.
Low oil pressure, Lack of oil	Oil viscosity too low, Oil filter clogged, Oil pump defective, Oil pressure regulating valve defective, Oil pressure sensor circuit defective	Refill up to level. Refill with correct viscosity of oil. Replace element. Readjust, replace or clean. Readjust or replace.

Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.

Common problems

White or blue exhaust smoke
Cause: Too much oil in crankcase, Oil viscosity too low
Fix: Use radiator cover, or clean, test and replace thermostat. Fill only to correct level on gauge. Refill with correct viscosity of oil.
Starter will not crank engine or cranks slowly, resulting in a failure of engine to start
Fix: Repair or replace. Battery — starter switch circuit open
Starter will crank engine, but engine will not start
Fix: Refuel. Consult Mitsubishi dealer.
Low oil pressure, Lack of oil
Cause: Oil viscosity too low, Oil filter clogged, Oil pump defective, Oil pressure regulating valve defective, Oil pressure sensor circuit defective
Fix: Refill up to level. Refill with correct viscosity of oil. Replace element. Readjust, replace or clean. Readjust or replace.
Injection timing incorrect, Compression pressure low
Fix: Readjust. Disassemble and replace parts. Change.
High oil consumption
Cause: Too high oil level in crankcase, Incorrect grade of oil, Oil leaks, Cylinders and piston rings worn
Fix: Maintain oil level in correct range on gauge. Use recommended type and SAE number of oil. Retighten or replace. Disassemble and replace parts.
High fuel consumption
Fix: Readjust or replace. Disassemble and replace parts. Change. Refill with correct type of fuel. Disassemble and replace parts. Clean or change air cleaner element. Check turbocharger.
Engine overheating
Cause: Valve clearance incorrect, Injection pump defective, Injection nozzles defective, Injection timing incorrect, Compression pressure low (cylinders and pistons worn)
Engine overcooled
Cause: Thermostat defective (no water temperature rise)
Fix: Use radiator cover, or clean, test and replace thermostat.
Engine lacks power
Cause: Incorrect grade of oil, Wrong type of fuel, Insufficient air (air cleaner clogged), Engine overcooled, Fuel feed pump gauze filter clogged
Black or gray exhaust smoke
Cause: Wrong type of fuel (low cetane number), Vaive clearance incorrect, Injection pump defective, Compression pressure low, Insufficient air (air cleaner clogged)
Fix: Refill with correct type of fuel. Readjust. Readjust or replace. Disassemble and replace parts. Clean or change element.

Compiled from service & troubleshooting documentation across every generator set that uses the Mitsubishi SIiI2R.

Maintenance schedule

Item	Spec	Part #	Interval
Air filter	Clean element when indicator shows RED.	—
Fuel filter	Change fuel filter when oil filter alarm lamp glows.	—	1000 hr
Oil filter	Disassemble filter and check for metal particles trapped in it. If such particles are found, consult your Mitsubishi dealer.	—	250 hr
Belt	Check tension with tum-buckle. Push belt inward with a thumb pressure of 10 to 15 kgf (22 to 33 Ibf) exerted midway between pulleys. Slack at this point should be 10 to 15 mm (0.4 to 0.6 in.). Adjust tension with tum-buckle.	—	250 hr
Coolant	Change coolant every 1 year. Use clean water that is soft, or as free as possible from scale forming minerals.	—	365 hr
Oil	Change oil when engine is still hot shortly after operation.	—	250 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Common questions

Which generators use the Mitsubishi SIiI2R engine?

The Mitsubishi SIiI2R powers 1 generator set(s), including Mitsubishi SIiI2R.

How often should you change the oil in the Mitsubishi SIiI2R?

The Mitsubishi SIiI2R oil change interval is every 250 hours.

What is a common problem with the Mitsubishi SIiI2R engine?

A commonly reported issue on generators using the Mitsubishi SIiI2R is: White or blue exhaust smoke. Cause: Too much oil in crankcase, Oil viscosity too low. Fix: Use radiator cover, or clean, test and replace thermostat. Fill only to correct level on gauge. Refill with correct viscosity of oil..