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MTU 12V 4000 G21R Engine

Name: MTU 12V 4000 G21R Engine
Brand: MTU

The MTU 12V 4000 G21R is an engine. It powers generator sets from MTU, including the DP 1290 D5S FW and DS 1445 D5S FW.

Also known as: MTU 12V 4000 G21R

Part of the MTU 12V4000 engine family — 62 variants share parts & fitment.

On this pageSpecs Generator sets Maintenance FAQ Torque & specs Wiring

Engine specifications

Generator sets powered by this engine

MTU DP 1290 D5S FWMTU DS 1445 D5S FW

How to read your MTU engine serial & model number →

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	Two-stage engine air filter operating in medium to heavy dust conditions; RadialSeal technology; filter insert and filter element combined; mounted filter service indicator; removing of 99.99% of dust and dirt particulate		—
Coolant	Flow rate of 38 l/min (10 GPM); adjustable thermostat from 32 to 55 C (90 to 130 F); single or 3-phase system; UL-C/US certificate E250789 (60 Hz models); CE compliant (50 Hz models)		—

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

Service specifications

Type	Item	Value	Unit	Condition
Temperature	Jacket water heater adjustable thermostat	32 to 55	°C

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
380/400/415				Standard scope voltage, 50 Hz (S1600/S2000/S4000)
380/440/480				Standard scope voltage, 60 Hz (S1600/S2000/S4000)
400/230				Standard scope voltage, 1600 series, 50 Hz
440/480				Alternator voltages, 60 Hz
480/277				Standard scope voltage, 1600 series, 60 Hz

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the MTU 12V4000 family

Part #	Description	Category
WM00076	Air filter element	air_filter
WM00086	Easy-change fuel filter	fuel_filter
WM00067	Oil filter element	oil_filter
3082751	Reman engine	other_service

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Also used in

Hitachi EH3000 — Haul Truck
Hitachi EH3500 — Haul Truck

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

Which generators use the MTU 12V 4000 G21R engine?

The MTU 12V 4000 G21R powers 2 generator set(s), including MTU DP 1290 D5S FW, MTU DS 1445 D5S FW.